CN116428521A

CN116428521A - Diluting sewage disposal device

Info

Publication number: CN116428521A
Application number: CN202310321489.1A
Authority: CN
Inventors: 李建中; 陈希凡; 颜庭军
Original assignee: CILIN & CAS ENVIRONMENTAL TECHNOLOGY (ANHUI) Inc
Current assignee: CILIN & CAS ENVIRONMENTAL TECHNOLOGY (ANHUI) Inc
Priority date: 2023-03-29
Filing date: 2023-03-29
Publication date: 2023-07-14

Abstract

The invention provides a dilution sewage disposal device which is provided with a flow cavity for completing dilution operation, wherein a medium inlet and a medium outlet are respectively arranged on a cavity of the flow cavity, and a drainage port for introducing external fluid into the flow cavity is also arranged on the cavity; the medium inlet and the drainage port are opened in a unidirectional way towards the flow cavity. The diluting and sewage discharging device can suck external seawater under the action of internal and external pressure difference through the drainage port which is communicated in a unidirectional way into the flow cavity, and meanwhile, sewage is prevented from flowing out from the drainage port. This allows the dilution of the highly concentrated effluent to be completed in the flow chamber and then discharged from the outlet. Therefore, the diluted water discharged from the outlet of the flow cavity can be reduced to the concentration within the standard requirement, and the ecological environment of the surrounding sea area is kept unaffected.

Description

Diluting sewage disposal device

Technical Field

The invention relates to the technical field of sewage pipes, in particular to a dilution sewage device.

Background

For large power plants, salt farms and sea water desalination projects, the water resources after utilization need to be discharged to the outside. When the large engineering site is selected at sea, the seawater resource can be directly utilized, and the utilized water resource can be simply treated and then discharged into the deep sea.

The treatment of water resources to be discharged is generally limited to ensuring that the composition of the discharged water is not out of standard according to the requirements of GB 3097. However, the temperature of the discharged water or the concentration of other components in the water is still high, and if the discharged water is directly discharged into the seawater in a concentrated manner, the ecological environment affecting the mixed flow area and the functional area adjacent to the mixed flow can be disturbed.

In the prior art, a plurality of dispersing pipes which are distributed in a dispersing way are generally adopted for dispersing effluent to reduce the influence of sewage with higher concentration on the ecological environment of a mixed flow area. It is noted, however, that the above approach avoids the ecological impact of large volumes of sewage on the same outflow location by dispersing the outflow and accelerates the mixing speed of the outflow with the surrounding sea water by the previously dispersed outflow. Overall, the effect is improved, but the ecological effect of the outflow on the vicinity of the outlet of the diffuser pipe is still evident, since the mixing process cannot be completed at one instant. On the other hand, the diffusion tubes which are arranged in a scattered manner occupy a larger sea area, which means that the area of the sea area affected by the outflow is enlarged.

Disclosure of Invention

Aiming at the problems that the ecological influence on an outlet area is still larger and the whole influence area is larger in the existing sea discharge pipeline design, the invention provides the dilution sewage disposal device.

The technical scheme of the invention provides a dilution sewage disposal device which is provided with a flow cavity for completing dilution operation, wherein a medium inlet and a medium outlet are respectively arranged on the cavity of the flow cavity, a drainage port for introducing external fluid into the flow cavity is also arranged on the cavity, and the drainage port is opened unidirectionally towards the inside of the flow cavity.

Preferably, the cavity extends in a tubular shape, and a flow cavity is formed inside the pipeline; one end of the cavity is connected with a medium inlet, the medium inlet is unidirectionally opened towards the inside of the flow cavity 1, and the other end of the cavity is connected with a medium outlet; the drainage ports are distributed on the cavity.

Preferably, the medium inlet and the drainage port are duckbill valves which are opened in a unidirectional way into the flow cavity.

Preferably, the drainage port is obliquely arranged on the cavity towards one side of the medium outlet, and an oblique angle between the drainage port and the radial direction of the cavity is 30-60 degrees.

Preferably, the sealing port of the drainage port is coplanar with the axis of the cavity.

Preferably, the cavity gradually expands in diameter from the medium inlet to the medium outlet.

Preferably, the drainage ports are arranged in at least one row along the axis on the cavity, and at least one drainage port is arranged in the circumferential direction of the cavity.

Preferably, the drainage openings are staggered in the circumferential direction of the cavity.

Preferably, a plurality of the drainage openings are distributed on the cavity along a spiral line.

Preferably, the pitch of the spiral increases gradually in the direction from the axis to the medium outlet.

Preferably, the drainage openings are distributed on only 1/2-2/3 of the circumferential surface of the cavity.

The dilution sewage disposal device can suck external seawater under the action of internal and external pressure difference through the drainage port which is communicated in one way into the flow cavity, and meanwhile, the sewage is prevented from flowing out from the drainage port. This allows the dilution of the highly concentrated effluent to be completed in the flow chamber and then discharged from the outlet. Therefore, the diluted water discharged from the outlet of the flow cavity can be reduced to the concentration within the standard requirement, and the ecological environment of the surrounding sea area is kept unaffected.

Drawings

FIG. 1 is a schematic cross-sectional view of a dilution drain of the present invention;

FIG. 2 is a schematic view of the installation of the vent of the present invention;

FIG. 3 is a schematic view of a dilution drain of the present invention;

FIG. 4 is another schematic distribution view of the drain opening of the dilution drain of the present invention;

fig. 5 is a layout schematic of the dilution drain of the present invention.

In the drawing the view of the figure,

1 flow chamber 13, chamber 11, medium inlet 12, medium outlet 2, drainage port 21, sealing port O, axis R, radial direction

Detailed Description

The present invention will be described in detail below with reference to the drawings and the specific embodiments, and in the present specification, the dimensional proportion of the drawings does not represent the actual dimensional proportion, but only represents the relative positional relationship and connection relationship between the components, and the components with the same names or the same reference numerals represent similar or identical structures, and are limited to the schematic purposes.

As shown in fig. 1, the present invention is directed to a dilution drain that is capable of accomplishing dilution of a medium (such as sewage to be discharged) internally. The diluting and sewage discharging device is provided with a flow cavity 1 for completing the diluting operation, a medium inlet 11 and a medium outlet 12 which are communicated with the flow cavity 1 and the outside are respectively arranged on a cavity 13 of the flow cavity 1, and a drainage port 2 for introducing external fluid such as seawater into the flow cavity 1 is also arranged on the cavity 13. Wherein the medium inlet 11 and the drainage port 2 are opened unidirectionally towards the inside of the flow chamber 1. The medium outlet 12 may be open or unidirectionally open towards the outside of the flow chamber 1. The medium inlet 11 is connected to the outlet end of the drain pipe and is submerged below the sea surface.

The dilution drain device is sunk below the sea surface and away from the shoreline when installed. The influence on the water quality of the offshore water body is mainly reduced when the water body is far away from the shoreline. The medium inlet 11 of which is connected to the drain line. After sinking below the sea surface, the medium outlet 12 is immersed in the sea water and communicates with the sea water in the sea area. Due to the existence of the drainage port 2 and the medium outlet 12, when no pollution is caused, the inside of the flow cavity 1 can be filled with the seawater flowing in through the drainage port 2 and the medium outlet 12 so as to balance the internal and external water pressure of the flow cavity 1. In the case of sewage running, sewage flows into the flow chamber 1 from the medium inlet 11, is diluted by mixing with the seawater existing in the flow chamber 1 at an early stage, and flows out from the medium outlet 12. In the sewage outflow process, the seawater in the wide sea area except the cavity 13 is sucked into the flow cavity 1 due to the internal and external pressure difference caused by the flow speed of the sewage at the drainage port 2 and is mixed with the sewage reaching the flow cavity 1, so that the sewage dilution treatment is realized. The inward unidirectional flow drainage port 2 provides the seawater needed for dilution, and meanwhile, the pollution to the current sea area after the sewage with higher concentration is discharged from the flow cavity 1 is avoided.

As shown in fig. 1, the cavity 13 extends in a tubular shape and is laid in a sea area further offshore, the interior of which forms the flow chamber 1. One end of the tubular cavity 13 is a medium inlet 11 which extends along the axis O and is connected with a sewage drain pipe; the other end is a medium outlet 12 which is communicated with the sea water. The drainage openings 2 are distributed on the cavity 13. When the sewage flows in, the sewage flows in from the medium inlet 11 and out from the medium outlet 12, the middle part of the sewage is subjected to a longer path in the flow cavity 1, and the external sewage is sucked into the flow cavity 1 through the drainage port 2 by the internal and external pressure difference formed by the flow velocity while the sewage flows through the flow cavity 1, so that the sewage to be discharged is diluted.

With existing sea installations, the number and distribution of blow-down outlets at the end of the pipeline is increased essentially by increasing the branching of the pipeline at the outlet. This essentially disperses the effluent into zero by the dispersion of the outlets in the sea area to avoid local sewage accumulation, and when sewage is accumulated in a small space, it is not easy to be mixed with seawater rapidly, so that the sewage at the initial concentration is maintained without dilution at each of the branch outlets of the pipeline, and the marine ecology around each of the branch outlets of the sea discharging device is affected. Compared with the prior sea draining device, the diluting and discharging device is a technical scheme of firstly diluting internally and then discharging, so that the sewage exceeding the standard concentration requirement does not flow out from the medium outlet 12 into the open sea to affect the marine ecological environment outside the medium outlet 12. In the diluting and sewage draining device of the invention, as long as the length of the cavity 13 is enough, sewage is not discharged in advance before dilution, but external seawater is sucked into the flow cavity 1 by utilizing fluid power during sewage draining, so that the seawater and the sewage are uniformly mixed in the flow cavity 1 and then discharged from the medium outlet 12. So that there is no problem of local concentration being too high even in the sea water near the medium outlet 12.

The medium inlet 11 and the drainage port 2 of the dilution drain device are preferably provided with the duckbill valve so as to realize the dilution drain device, and the duckbill valve has the characteristic of unpowered opening when realizing unidirectional circulation, so that maintenance-free after being thrown into the sea can be realized, and the problem of inconvenient maintenance after the dilution drain device is immersed below the sea surface is solved. Fig. 2 is a schematic view showing the specific installation of the drainage port 2. In order to avoid the problem that the duckbill valve cannot be opened due to forward impact of incoming flow on the drainage port 2, the drainage port 2 should be arranged in a downstream deflection manner in the radial direction R corresponding to the installation position, so as to ensure that the hydrodynamic pressure at the drainage port 2 reduces the sucked seawater and ensure that the sucked seawater and sewage flowing in the flow cavity 1 are smoothly converged. The deflection angle α of the drainage opening 2 is preferably set to 30 to 60 °. The drainage port 2 is a duckbill valve, and the sealing port 21 is arranged inside the flow chamber 1, so that the continuous flow of sewage in the flow chamber 1 is blocked. Of course, a proper obstruction is advantageous, and the laminar flow state of the incoming flow can be broken, so that the incoming flow is separated after encountering the diversion port 2, thereby forming a turbulent flow in the flow cavity 1 and accelerating the mixing of sewage and sucked seawater. Based on this, the sealing opening 21 is preferably parallel to the O-R radial plane shown in the drawing.

Fig. 3 is a schematic general structural view of the dilution drain. In order to achieve the desired dilution of the seawater entering the flow chamber 1, the drainage port 2 is provided with a plurality or rows along the axis O on the cavity 13 of the flow chamber 1. So that the step dilution process is sequentially completed by sequentially sucking seawater through the plurality of rows of drainage ports 2 in the process that the medium sewage enters from the medium inlet 11, passes through the flow cavity 1 and flows out from the medium outlet 12. It is also contemplated that a plurality of vents 2 may be provided in the circumferential direction of the cavity 13, the plurality of vents 2 being offset from each other in the circumferential direction of the cavity 13 to avoid outflow at the same location in the axial O direction of the cavity 13. As a more preferable technical solution, as shown in fig. 4, the drainage ports 2 are preferably spirally arranged on the cavity 13, so that the drainage ports 2 are uniformly staggered and distributed on the cavity 13. Considering that the velocity of the sewage input from the flow chamber 1 gradually decreases due to the continuous intake of seawater in the flow chamber 1 and the existence of the resistance along the way in the flow chamber 1, the capacity of intake of seawater decreases, and the problem can be balanced by the gradual increase of the axial distance of the drainage ports 2. When the drainage ports 2 are spirally arranged on the cavity 13, the screw pitch is gradually increased along the direction from the axis O to the medium outlet 12, so that the distance between the drainage ports 2 is gradually increased along the axis O to the medium outlet 12, and the problem of insufficient balance power is solved. As the intake of seawater increases the liquid entering the flow chamber 1, alternatively the chamber 13 may be provided with a variable diameter increasing shape to match the problem, based on which a simplified design is to have the diameter of the chamber 13 increase linearly from the medium inlet 11 to the medium outlet 12, giving the flow chamber 1 an elongated variable cross-section cavity.

As shown in fig. 5, in the actual installation process, the dilution and sewage disposal device is placed below the sea surface, and can be placed in a sea area with a certain height from the sea bottom in a supporting or hanging manner, at this time, the cavity 13 is suspended from four sides and directly contacts with the sea water, and special treatment is not needed. However, this is generally difficult to achieve and does not allow for reliable fixing and control of the dilution drain. More often, the cavity 13 is thus placed directly on the seabed, as shown in fig. 5, and the lower part of the cavity 13 is in contact with the seabed or the foundation, taking care to avoid the drainage port 2 from the seabed. Therefore, the drainage ports 2 should be distributed only on the circumferential surface of the cavity 13 which is not in contact with the seabed, and in practical construction, it is generally required that the drainage ports 2 are distributed only on 1/2 to 2/3 of the circumferential surface of the cavity 13, and in installation construction, it is required that a part of the circumference not provided with the drainage ports 2 is used as a contact surface to be installed on the seabed or foundation. As a preferred embodiment, the circumferential arrangement of the drainage openings 2 in 3 groups is one of the more suitable embodiments.

The sewage of the existing dispersion outlet type sea draining device is directly drained into the sea area from each branch outflow, and the influence of the sewage on the peripheral ecology is reduced by means of the gradual mixing of the sewage dispersed in a large-scale sea area and the seawater. Clearly, when sewage is just discharged from the branch outlet, it is impossible to immediately reduce the sewage to below the required concentration limit, so that the ecological influence on the periphery of the outlet is still serious, and harmless discharge is difficult to completely achieve. Compared with the prior art, the dilution sewage disposal device of the invention essentially belongs to an internal dilution type sea drainage device, the dilution process occurs in the flow cavity 1, and the concentration of substances in liquid discharged from the medium outlet 12 after dilution is reduced to be within the allowable range, so that the ecological environment of the sea area around the sewage disposal device is not influenced at all. On the other hand, the existing dispersion outlet type sea discharging device needs to be provided with a plurality of discharging outlets, is generally arranged on the sea floor in a branch-shaped structure, and needs to carry out proper hardening treatment on sea floors of the sea discharging device arrangement position by using stones and the like, and the branch-shaped structure brings difficulty to offshore segmented assembly and increases the earthwork load when being arranged.

The foregoing is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and various modifications and improvements made by those skilled in the art to which the invention pertains will fall within the scope of the invention as defined by the appended claims without departing from the spirit of the invention.

Claims

1. The utility model provides a diluting drain, its characterized in that has flow chamber (1) that are used for accomplishing the dilution operation, is provided with medium entry (11) and medium export (12) on cavity (13) of flow chamber (1) respectively, still is provided with on cavity (13) and introduces drainage mouth (2) of flow chamber (1) with outside fluid, and drainage mouth (2) are opened in the one-way towards flow chamber (1).

2. A dilution drain according to claim 1, wherein the cavity (13) extends in a tubular shape, the interior of the conduit forming a flow chamber (1); one end of the cavity (13) is connected with the medium inlet (11), the medium inlet (11) is unidirectionally opened towards the inside of the flow cavity (1), and the other end is connected with the medium outlet (12); the drainage ports (2) are distributed on the cavity (13).

3. A dilution drain according to claim 2, wherein the medium inlet (11) and the drain (2) are duckbill valves that open unidirectionally into the flow chamber (1).

4. A dilution drain according to claim 3, wherein the drain opening (2) is arranged on the cavity (13) obliquely to the side of the medium outlet (12), the angle of inclination between the drain opening (2) and the radial direction of the cavity (13) being 30-60 °.

5. A dilution drain according to claim 3, wherein the sealing mouth (21) of the drain mouth (2) is coplanar with the axis of the cavity.

6. A dilution drain according to claim 5, wherein the cavity (13) gradually enlarges in diameter from the medium inlet (11) to the medium outlet (12).

7. A dilution drain according to any one of claims 1-5, wherein the drain (2) is provided with at least one row along the axis (O) on the cavity (13), at least one being provided in the circumferential direction of the cavity (13).

8. The dilution drain according to claim 7, wherein the drainage ports (2) are arranged offset from each other in the circumferential direction of the cavity (13).

9. A dilution drain according to any of the claims 1-5, wherein a plurality of the drainage openings (2) are distributed along a spiral line over the cavity (13).

10. A dilution drain according to claim 9, wherein the pitch of the spiral increases gradually in the direction from the axis (O) to the medium outlet (12).

11. A dilution drain according to any one of claims 1-5, characterized in that the drainage openings (2) are distributed only on 1/2-2/3 of the circumferential surface of the cavity (13).