A concentrated brine discharge device for seawater desalination
By designing a spiral transmission blade with varying pitch, the energy loss and uneven concentration issues of the concentrated brine discharge device were resolved, achieving efficient mixing and environmentally friendly discharge.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QINGDAO JINLI IND EQUIPMENT CO LTD
- Filing Date
- 2025-07-18
- Publication Date
- 2026-06-19
AI Technical Summary
Existing concentrated brine discharge devices use simple mixing methods, resulting in high energy consumption, uneven local concentrations, and a lack of phased control design, which increases environmental risks.
The design employs a helical transmission blade with varying pitch in different regions. The initial pitch is small to reduce impact, while the pitch increases later to enhance swirling flow, achieving phased mixing control and breaking the aggregation state of concentrated brine.
It significantly reduces energy loss, improves mixing efficiency and uniformity, and reduces local impacts on the marine environment.
Smart Images
Figure CN224371167U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of seawater desalination technology, and in particular to a concentrated brine discharge device for seawater desalination. Background Technology
[0002] In the seawater desalination industry, the safe and efficient discharge of concentrated brine is crucial for ensuring the sustainable operation of the desalination process and minimizing its impact on the surrounding marine environment. The concentrated brine produced during desalination has a much higher salt content than natural seawater. If directly discharged into the marine environment, it can easily form a high-concentration salt accumulation zone near the discharge point, leading to abnormal local seawater osmotic pressure, adversely affecting the habitat of marine life, and even disrupting the regional marine ecological balance. Therefore, how to achieve thorough mixing of concentrated brine with seawater through technological means to reduce the salt concentration gradient around the discharge point has become the core research direction for concentrated brine discharge technology.
[0003] Currently, most existing concentrated brine discharge devices employ direct discharge or simple mixing methods, which often fail to meet environmental protection requirements. Although some devices incorporate disturbance structures such as helical blades to enhance mixing, the blades are often designed with a constant pitch. When seawater enters the helical section, it is easily subjected to violent rotational impacts, leading to sudden changes in flow velocity and the generation of numerous eddies. This not only causes significant energy loss and reduces system operating efficiency, but also, due to excessive initial disturbance intensity, forces concentrated brine into the swirling flow before it has fully diffused, exacerbating the problem of uneven local concentration.
[0004] In addition, traditional devices lack a phased control design for the mixing process. After concentrated brine enters the discharge pipe, the initial aggregation state is often not effectively broken, resulting in the phenomenon of "local high concentration zones" that are difficult to eliminate in the subsequent mixing process. In the end, the discharged mixed water still has uneven concentration distribution, which increases the potential risk of impact on the surrounding marine environment. Utility Model Content
[0005] This utility model relates to a concentrated brine discharge device for seawater desalination, which solves the problems of existing concentrated brine discharge devices, which are either ineffective due to simple mixing methods, or suffer from severe initial impact, high energy loss, and uneven local concentration due to the use of equal-pitch spiral blades, and lack of staged control design, making it difficult to control the accumulation of concentrated brine, which easily leads to uneven concentration distribution in the discharged water and increases environmental risks.
[0006] This utility model provides a concentrated brine discharge device for seawater desalination, specifically including: a discharge pipe, the discharge pipe being a circular pipe, a central sealing column being provided at the axial part of the inner circumferential surface of the discharge pipe, the diameter of the central sealing column being smaller than the diameter of the inner circumferential surface of the discharge pipe; a spiral conduction blade being fixedly installed between the inner circumferential surface of the discharge pipe and the outer circumferential surface of the central sealing column; and a discharge matching cavity being provided in the middle part of the discharge pipe, the discharge matching cavity having an annular cavity structure.
[0007] Furthermore, a top connecting pipe connected to the discharge cavity is fixedly installed at the top of the discharge pipe, and a conveying pipe is sealed with a flange on the top face of the top connecting pipe.
[0008] Furthermore, the pitch of the helical transmission blade corresponding to the discharge mating cavity region is smaller than the pitch of other regions.
[0009] Furthermore, a row of discharge holes communicating with the discharge mating cavity is opened on the top of the inner circumferential surface of the discharge pipe. The discharge holes are round holes, and the position of the row of discharge holes is separate from the position of the spiral conduction blade.
[0010] Furthermore, a row of discharge holes communicating with the discharge mating cavity is also provided at the bottom of the inner circumferential surface of the discharge pipe. The position of this row of discharge holes is separate from the position of the spiral conduction blade.
[0011] This utility model provides a concentrated brine discharge device for seawater desalination, which has the following beneficial effects:
[0012] This invention features a special structure where the pitch of the spiral conveying blades in the corresponding discharge cavity area is smaller than in other areas. This design allows the initial thrust of the blades on the seawater entering the spiral conveying cavity to be gentler, primarily resulting in low-intensity rotational propulsion along the axial direction. This effectively avoids the sudden velocity change caused by the violent rotational impact when seawater first enters the spiral section, significantly reducing eddy currents and energy loss, and improving the stability and energy efficiency of the system.
[0013] This invention, based on the design of a pitch-changing structure of helical conveying blades, enables the initial low-intensity rotation of seawater during its initial entry stage to preliminarily "disperse" the concentrated brine discharged through the discharge port, effectively breaking the aggregation of concentrated brine and creating uniform and stable initial conditions for the subsequent mixing process. This reduces the risk of excessively high local concentrations of concentrated brine from the source. As seawater flows along the helical conveying chamber, the blade pitch gradually decreases, gradually increasing the "torsional force." The rotational speed (tangential velocity) of the seawater rapidly increases, forming a high-intensity vortex. This phased, progressively increasing vortex intensity design allows for step-by-step turbulent mixing with the concentrated brine: the initial low-intensity rotation lays a uniform foundation, while the later high-intensity vortex achieves deep mixing, ultimately significantly improving the mixing efficiency and uniformity of the concentrated brine and seawater, and reducing the local impact on the surrounding marine environment after discharge. Attached Figure Description
[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly described below.
[0015] The accompanying drawings described below are only related to some embodiments of the present invention and are not intended to limit the scope of the present invention.
[0016] In the attached diagram:
[0017] Figure 1 A cross-sectional structural schematic diagram of the present invention is shown;
[0018] Figure 2 This utility model illustrates Figure 1 A magnified view of the structure at point A in the middle;
[0019] Figure 3 This utility model illustrates Figure 1 Schematic diagram of the cross-sectional structure of the middle BB;
[0020] List of reference numerals
[0021] 1. Discharge pipe; 101. Central sealing column; 102. Helical conduction blade; 103. Discharge mating cavity; 104. Top connecting pipe; 105. Conveying pipe; 106. Discharge port. Detailed Implementation
[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the described embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0023] Example: Please refer to Figures 1 to 3 :
[0024] This utility model proposes a concentrated brine discharge device for seawater desalination, comprising: a discharge pipe 1, which is a circular pipe, with a central sealing column 101 located at the axial center of the inner circumferential surface of the discharge pipe 1, the diameter of which is smaller than the diameter of the inner circumferential surface of the discharge pipe 1; a spiral conduction blade 102 is fixedly installed between the inner circumferential surface of the discharge pipe 1 and the outer circumferential surface of the central sealing column 101; a discharge mating cavity 103 is opened in the middle of the discharge pipe 1, the discharge mating cavity 103 having an annular cavity structure; a top connecting pipe 104 connected to the discharge mating cavity 103 is fixedly installed at the top of the discharge pipe 1, and a conveying pipe 105 is sealed with a flange on the top surface of the top connecting pipe 104.
[0025] Among them, the pitch of the spiral conduction blade 102 corresponding to the region of the discharge mating cavity 103 is smaller than that of other regions. In the scenario of mixing concentrated brine and seawater, the "large pitch in the early stage + small pitch in the later stage" of the spiral conduction blade 102 can achieve staged mixing control. A row of discharge holes 106 connected to the discharge mating cavity 103 is opened at the top of the inner circumferential surface of the discharge pipe 1. The discharge holes 106 are round holes. The position of the row of discharge holes 106 is separated from the position of the blade of the spiral conduction blade 102. A row of discharge holes 106 connected to the discharge mating cavity 103 is also opened at the bottom of the inner circumferential surface of the discharge pipe 1. The position of the row of discharge holes 106 is separated from the position of the blade of the spiral conduction blade 102. Therefore, it is ensured that when high brine is discharged into the inner circumferential surface of the discharge pipe 1 through the discharge holes 106, the blade of the spiral conduction blade 102 will not cause obstruction.
[0026] The working principle of this embodiment:
[0027] The top of the conveying pipe 105 is sealed to the flange of the concentrated brine conveying pipe; the discharge pipe 1 is placed in a seawater environment;
[0028] When concentrated brine is discharged, concentrated brine is input into the discharge cavity 103 through the delivery pipe 105 and the top connecting pipe 104, and discharged into the inner circumferential surface of the discharge pipe 1 through the discharge hole 106 connected to the discharge cavity 103.
[0029] Seawater enters through the opening of the discharge pipe 1 and moves along the spiral conveying cavity formed by the spiral transmission blades 102. Because the pitch of the spiral transmission blades 102 in the region corresponding to the discharge mating cavity 103 is smaller than the pitch in other regions, the "thrust" of the blades on the seawater is gentler when the seawater begins to move along the spiral conveying cavity formed by the spiral transmission blades 102. The seawater mainly rotates at low intensity in the initial stage and moves along the axial direction to avoid the seawater being subjected to violent rotational impact as soon as it enters the spiral section, thereby reducing the eddies and energy loss caused by sudden changes in flow velocity. At the same time, the low-intensity rotation initially "disperses" the aggregated state of the concentrated brine, creating uniform initial conditions for subsequent mixing.
[0030] As seawater continues to flow along the spiral conveying chamber, the blade pitch gradually decreases, and the "torsional force" of the blade on the seawater gradually increases, causing the rotational speed (tangential velocity) of the seawater to increase rapidly, eventually forming a high-intensity vortex. During this process, the vortex mixes strongly with the concentrated brine discharged through the discharge port 106, achieving a phased mixing control effect. Finally, the mixed fluid is discharged through the discharge pipe 1.
Claims
1. A concentrated brine discharge device for seawater desalination, characterized in that, include: The discharge pipe (1) is a circular pipe. A central sealing column (101) is provided at the axial part of the inner circumferential surface of the discharge pipe (1). The diameter of the central sealing column (101) is smaller than the diameter of the inner circumferential surface of the discharge pipe (1). A spiral conduction blade (102) is fixedly installed between the inner circumferential surface of the discharge pipe (1) and the outer circumferential surface of the central sealing column (101). A discharge matching cavity (103) is opened in the middle part of the discharge pipe (1). The discharge matching cavity (103) has an annular cavity structure.
2. The concentrated brine discharge device for seawater desalination according to claim 1, characterized in that, The top of the discharge pipe (1) is fixedly installed with a top connecting pipe (104) that is connected to the discharge mating cavity (103), and a conveying pipe (105) is sealed with a flange on the top surface of the top connecting pipe (104).
3. The concentrated brine discharge device for seawater desalination according to claim 2, characterized in that, The pitch of the spiral guide blade (102) in the region of the discharge mating cavity (103) is smaller than the pitch in other regions.
4. The concentrated brine discharge device for seawater desalination according to claim 3, characterized in that, The top of the inner circumferential surface of the discharge pipe (1) has a row of discharge holes (106) that are connected to the discharge mating cavity (103). The discharge holes (106) are round holes. The position of the row of discharge holes (106) is separate from the position of the blade of the spiral transmission blade (102).
5. A concentrated brine discharge device for seawater desalination according to claim 4, characterized in that, The bottom of the inner circumferential surface of the discharge pipe (1) is also provided with a row of discharge holes (106) that are connected to the discharge mating cavity (103). The position of the row of discharge holes (106) is separate from the position of the blade of the spiral transmission blade (102).