Sewage settling device and circulating water system

Abstract

The utility model relates to a sewage settling device and a circulating water system, the sewage settling device comprises: a circulating water tank having a circulating water inlet, a circulating water outlet and a waste water outlet, the circulating water inlet is used for introducing low pressure circulating water participating in coal gasification reaction, and the waste water outlet is used for being communicated with a waste water cooling device; a wastewater pipeline is arranged between the wastewater outlet and the wastewater cooling device; the material supply assembly is provided with a material supply unit, a first material supply pipeline and a second material supply pipeline, the first material supply pipeline is communicated with the material supply unit and the circulating water tank, the first material supply pipeline is used for introducing a dispersing agent into the circulating water tank, one end of the second material supply pipeline is communicated with the first material supply pipeline, and the other end of the second material supply pipeline is communicated with the wastewater pipeline; and the dispersing agent is introduced into the circulating water in the wastewater pipeline again. Through the technical scheme provided by the invention, the problem that the interior of the wastewater cooling device in the prior art is easy to scale can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal gasification, in particular to a sewage sedimentation device and a circulating water system. Background Art

[0002] At present, in the field of coal gasification technology, entrained-bed gasification technology has become the mainstream gasification technology due to its advantages such as strong raw material adaptability, high carbon conversion rate, high cold gas efficiency and suitability for large-scale industrial production. In the process of entrained-bed gasification, a large amount of carbon dioxide is generated in the process gas generated in the coal-to-liquid gasifier to form HCO 3- , HCO 3- Decomposes into CO3 at high temperature 2- Ca in black water 2+ Mg 2+ Plasma produces CaCO3 and MgCO3 and precipitates, and a series of reactions will occur under high temperature gasification reaction or rapid cooling conditions in the gasifier to produce a variety of acidic substances. Under acidic conditions, Ca contained in the raw coal 2+ Mg 2+ , Fe 2+ 、Al 3+ It reacts with SiO3 to generate silicate and silicate crystal polymers, forming precipitation. In order to reduce precipitation and scaling during the black water treatment process, flocculants are added during the black water treatment process to settle the suspended particles in the water to delay scaling. The upper clear liquid after the black water is settled will be treated with dispersant again. The treated water will be returned to the gasification system as low-pressure circulating water for repeated use.

[0003] In the prior art, after adding dispersant to the low-pressure circulating water after sedimentation, when the low-pressure circulating water is reused in the gasification system, in order to prevent the concentration and enrichment of ions in the system and deterioration of water quality, a part of the low-pressure circulating water will be discharged. Before discharge, this part of wastewater needs to be cooled by a wastewater cooling device. When the wastewater is cooled in the wastewater cooling device, more polymers will precipitate, resulting in scaling inside the wastewater cooling device, reducing the service life of the wastewater cooling device, and requiring frequent shutdown and disassembly for inspection and descaling, which will increase labor intensity and reduce production efficiency. Utility Model Content

[0004] The utility model provides a sewage sedimentation device and a circulating water system to solve the problem of easy scaling inside the wastewater cooling device in the prior art.

[0005] According to one aspect of the utility model, a sewage sedimentation device is provided, which includes: a circulating water tank, having a circulating water inlet, a circulating water outlet and a wastewater outlet, the circulating water inlet is used to introduce low-pressure circulating water after participating in the coal gasification reaction, the wastewater outlet is used to communicate with a wastewater cooling device, and a wastewater pipeline is arranged between the wastewater outlet and the wastewater cooling device; a feeding component, having a feeding unit, a first feeding pipeline and a second feeding pipeline, the first feeding pipeline is respectively connected to the feeding unit and the circulating water tank, the first feeding pipeline is used to introduce a dispersant into the circulating water tank, one end of the second feeding pipeline is connected to the first feeding pipeline, and the other end of the second feeding pipeline is connected to the wastewater pipeline, so as to introduce the dispersant into the circulating water in the wastewater pipeline again.

[0006] Furthermore, the feeding unit includes: a storage barrel, which is used to contain the dispersant; a feeding pump, which is connected to the storage barrel and the first feeding pipeline respectively, and the feeding pump is located upstream of the connection between the first feeding pipeline and the second feeding pipeline, and the feeding pump is used to pump the dispersant in the storage barrel into the first feeding pipeline and the second feeding pipeline. A first control unit is arranged between the feeding pump and the first feeding pipeline to control the flow rate of the dispersant in the first feeding pipeline.

[0007] Furthermore, the first control unit includes: a first flow meter, which is used to detect the flow rate of the dispersant in the first feed pipeline; a first controller, which is electrically connected to the feed pump and the first flow meter, respectively, and the first controller can adjust the flow rate of the dispersant pumped by the feed pump to the first feed pipeline according to the parameters of the first flow meter.

[0008] Furthermore, a second control unit is provided on the second feed pipeline, and the second control unit includes: a second flow meter, which is used to detect the flow rate of the dispersant in the second feed pipeline; a second controller and an electric control valve, and the second controller is electrically connected to the second flow meter and the electric control valve respectively, and the second controller can adjust the flow rate of the dispersant in the second feed pipeline according to the parameters of the second flow meter.

[0009] Furthermore, the sewage sedimentation device also includes a feed pipeline, which is connected to the circulating water inlet. A third control unit is arranged on the feed pipeline, and the third control unit includes: a third flow meter, which is used to detect the flow of low-pressure circulating water in the feed pipeline; a third controller, which is electrically connected to the feed pump, the first flow meter and the third flow meter respectively, and the third controller can compare the parameters of the first flow meter and the third flow meter to adjust the flow of the dispersant pumped by the feed pump to the first feed pipeline.

[0010] Furthermore, the circulating water tank has a mixing chamber, in which a circulating water pipe is arranged, the circulating water pipe has a circulating water inlet, and the circulating water pipe includes: a main line, which extends in a horizontal direction; and a branch line, in which a plurality of branch lines are arranged, all of which are connected to the main line and are arranged at intervals along the extension direction of the main line.

[0011] Furthermore, the circulating water pipe also includes an extension pipeline, one end of which is provided with a circulating water inlet, the other end of which is connected to the main line, the extension pipeline extends along the height direction of the circulating water tank, and the circulating water inlet is located above the main line.

[0012] Furthermore, the sum of the flow areas of the plurality of branch pipelines is less than or equal to the flow area of ​​the main pipeline.

[0013] Furthermore, the top of the circulating water tank is provided with a vent, which is connected to the outside and is used to balance the internal pressure of the circulating water tank.

[0014] According to another aspect of the utility model, a circulating water system is provided, and the circulating water system includes the above-mentioned sewage sedimentation device.

[0015] Applying the technical solution provided by the utility model, the sewage sedimentation device includes a circulating water tank and a feeding assembly, the low-pressure circulating water after participating in the coal gasification reaction introduced into the circulating water inlet and the dispersant provided by the feeding unit through the first feeding pipeline are coagulated in the circulating water tank, and part of the water after coagulation and sedimentation can be introduced into the gasification system again through the circulating water outlet to reduce resource waste, and the remaining part of the water after coagulation and sedimentation is discharged to the wastewater cooling device through the wastewater outlet and the wastewater pipeline, and discharged after cooling, which can prevent ion concentration and enrichment in the gasification system and prevent deterioration of water quality. In the present application, by setting a second feeding pipeline between the first feeding pipeline and the wastewater pipeline, part of the dispersant in the first feeding pipeline is introduced into the wastewater that has been coagulated once, so that more dispersant is added to the water discharged to the wastewater cooling device, reducing the precipitation of salt and crystalline polymers in the wastewater, reducing the scaling inside the wastewater cooling device, and improving the service life of the wastewater cooling device. Reduce the maintenance frequency of the wastewater cooling device, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of a sewage sedimentation device provided by the utility model is shown.

[0018] The above drawings include the following reference numerals:

[0019] 10. Circulating water tank;

[0020] 11. Circulating water inlet; 111. Feed pipeline; 112. Third flow meter;

[0021] 12. Circulating water outlet; 13. Wastewater outlet; 131. Wastewater pipeline;

[0022] 14. Circulating water pipe; 141. Main pipeline; 142. Branch pipeline; 143. Extension pipeline;

[0023] 15. Release the mouth;

[0024] 20. Feeding assembly;

[0025] 21. Feeding unit; 211. Storage cylinder; 212. Feeding pump; 213. First flow meter;

[0026] 22. First feed pipeline; 221. Second flow meter; 222. Electric control valve;

[0027] 23. The second feed pipeline. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0029] like Figure 1 As shown, the embodiment of the utility model provides a sewage sedimentation device, which includes a circulating water tank 10 and a feeding assembly 20. Among them, the circulating water tank 10 has a circulating water inlet 11, a circulating water outlet 12 and a wastewater outlet 13. The circulating water inlet 11 is used to pass low-pressure circulating water after participating in the coal gasification reaction, and the wastewater outlet 13 is used to communicate with the wastewater cooling device. A wastewater pipeline 131 is arranged between the wastewater outlet 13 and the wastewater cooling device. The feeding assembly 20 has a feeding unit 21, a first feeding pipeline 22 and a second feeding pipeline 23. The first feeding pipeline 22 is respectively connected to the feeding unit 21 and the circulating water tank 10. The first feeding pipeline 22 is used to pass a dispersant into the circulating water tank 10. One end of the second feeding pipeline 23 is connected to the first feeding pipeline 22, and the other end of the second feeding pipeline 23 is connected to the wastewater pipeline 131, so as to pass the dispersant into the circulating water in the wastewater pipeline 131 again.

[0030] By applying the technical solution provided by the utility model, the sewage sedimentation device includes a circulating water tank 10 and a feeding assembly 20. The low-pressure circulating water participating in the coal gasification reaction introduced through the circulating water inlet 11 and the dispersant provided by the feeding unit 21 through the first feeding pipeline 22 are coagulated in the circulating water tank 10. Part of the water that has undergone coagulation and sedimentation can be reintroduced into the gasification system through the circulating water outlet 12 to reduce resource waste. The remaining part of the water that has undergone coagulation and sedimentation is discharged to the wastewater cooling device through the wastewater outlet 13 and the wastewater pipeline 131, and is discharged after cooling, which can prevent ion concentration and enrichment in the gasification system and prevent deterioration of water quality. In the present application, a second feed pipeline 23 is set between the first feed pipeline 22 and the wastewater pipeline 131, and part of the dispersant in the first feed pipeline 22 is introduced into the wastewater that has undergone primary coagulation, so that more dispersant is added to the water discharged to the wastewater cooling device, thereby reducing the precipitation of salt and crystalline polymers in the wastewater, reducing scaling inside the wastewater cooling device, increasing the service life of the wastewater cooling device, reducing the maintenance frequency of the wastewater cooling device, and thereby improving work efficiency.

[0031] Specifically in the present application, the feeding unit 21 includes a storage barrel 211 and a feeding pump 212. The storage barrel 211 is used to contain the dispersant, and the feeding pump 212 is connected to the storage barrel 211 and the first feeding pipeline 22 respectively, and the feeding pump 212 is located upstream of the connection between the first feeding pipeline 22 and the second feeding pipeline 23. The feeding pump 212 is used to pump the dispersant in the storage barrel 211 into the first feeding pipeline 22 and the second feeding pipeline 23. A first control unit is provided between the feeding pump 212 and the first feeding pipeline 22 to control the flow rate of the dispersant in the first feeding pipeline 22. Through the above-mentioned setting, when the water quality or water volume of the low-pressure circulating water participating in the coal gasification reaction introduced into the circulating water tank 10 changes, the amount of feeding of the feeding unit 21 can be adjusted by the first control unit to adapt to the use requirements of the dispersant under different working conditions, ensure the stability of various water quality indicators, and delay system scaling.

[0032] Specifically, the first control unit includes a first flow meter 213 and a first controller. The first flow meter 213 is used to detect the flow of the dispersant in the first feed pipeline 22. The first controller is electrically connected to the feed pump 212 and the first flow meter 213 respectively. The first controller can adjust the flow of the dispersant pumped by the feed pump 212 to the first feed pipeline 22 according to the parameters of the first flow meter 213. Specifically, the feed pump 212 can be set as a variable frequency pump. The first controller determines whether the flow of the dispersant in the current first feed pipeline 22 meets the preset parameters through the first flow meter 213, and adjusts the frequency of the feed pump 212 to adjust the amount of feed of the feed unit 21, thereby realizing intelligent adjustment.

[0033] Furthermore, the sewage settling device also includes a feed pipeline 111, which is connected to the circulating water inlet 11, and a third control unit is provided on the feed pipeline 111, and the third control unit includes a third flow meter 112 and a third controller. Among them, the third flow meter 112 is used to detect the flow of low-pressure circulating water in the feed pipeline 111, and the third controller is electrically connected to the feed pump 212, the first flow meter 213 and the third flow meter 112 respectively, and the third controller can compare the parameters of the first flow meter 213 and the third flow meter 112 to adjust the flow of the dispersant pumped by the feed pump 212 to the first feed pipeline 22. Through the above-mentioned setting, the amount of dispersant supplied by the feed unit 21 can be automatically adjusted according to the amount of system circulating water entering the circulating water tank 10, ensuring the stability of the dosing concentration, ensuring the stability of various water quality indicators, delaying the scaling of the wastewater cooling device and the gasification system, and thus extending the operation cycle of the low-pressure circulating water system.

[0034] In the present application, a second control unit is provided on the second feed pipeline 23, and the second control unit includes a second flow meter 221, a second controller and an electric control valve 222. Among them, the second flow meter 221 is used to detect the flow of the dispersant in the second feed pipeline 23, and the second controller is electrically connected to the second flow meter 221 and the electric control valve 222 respectively, and the second controller can adjust the flow of the dispersant in the second feed pipeline 23 according to the parameters of the second flow meter 221. Through the above-mentioned setting, the second controller can compare the parameters of the second flow meter 221 with the preset parameters or the temporarily adjusted parameters, and adjust the opening of the electric control valve 222, so that the amount of dispersant introduced into the second feed pipeline 23 meets the use requirements, and prevents excessive amount of dispersant from causing material waste, or too little amount of dispersant from causing scaling inside the wastewater cooling device.

[0035] Specifically in the present application, the circulating water tank 10 has a mixing chamber, a circulating water pipe 14 is arranged in the mixing chamber, the circulating water pipe 14 has a circulating water inlet 11, and the circulating water pipe 14 includes a main line 141 and a branch line 142. Among them, the main line 141 extends in the horizontal direction, and a plurality of branch lines 142 are arranged, and the plurality of branch lines 142 are all connected to the main line 141, and are arranged at intervals along the extension direction of the main line 141, and the branch lines 142 can form a water outlet. Through the above arrangement, the plurality of branch lines 142 can make the low-pressure circulating water entering the mixing chamber fall evenly to the bottom of the mixing chamber, so that a large amount of ash can be prevented from being deposited locally at the bottom of the mixing chamber. After a large amount of ash is deposited locally, it will block the circulating water outlet 12 or the wastewater outlet 13. By setting a plurality of branch lines 142, the maintenance frequency of the circulating water outlet 12 and the wastewater outlet 13 can be reduced, and the use effect of the circulating water tank 10 can be improved.

[0036] In this solution, the number of branch pipelines 142 is not limited, as long as the use requirements of the circulating water tank 10 can be met.

[0037] Furthermore, the circulating water pipe 14 further includes an extension line 143, one end of which is provided with a circulating water inlet 11, the other end of which is connected to the main line 141, the extension line 143 extends along the height direction of the circulating water tank 10, and the circulating water inlet 11 is located above the main line 141. Through the above arrangement, the height of the main line 141 can be reduced, and then the height of the branch line 142 can be reduced, so as to prevent the water flowing into the mixing chamber from causing a large impact on the circulating water tank 10.

[0038] Specifically, in the present application, the sum of the flow areas of the multiple branch lines 142 is less than or equal to the flow area of ​​the main line 141. When the sum of the flow areas of the multiple branch lines 142 is greater than the flow area of ​​the main line 141, water will generate a pressure drop when flowing into the mixing chamber, affecting the flow efficiency of the water flow in the circulating water pipe 14. Through the above arrangement, the flow effect of the water flow can be guaranteed, and the water intake efficiency of the circulating water tank 10 can be guaranteed.

[0039] Furthermore, the top of the circulating water tank 10 is provided with a vent 15, which is connected to the outside world and is used to balance the internal pressure of the circulating water tank 10. Through the above arrangement, the internal pressure of the circulating water tank 10 can be ensured to be equal to the external pressure, and the circulating water tank 10 can be prevented from being deformed, and the coagulation effect of the dispersant and the low-pressure circulating water in the mixing chamber can be ensured, and the coagulation of the dispersant is prevented from being reduced under the influence of pressure, and the sedimentation effect of the sewage sedimentation device can be ensured.

[0040] According to an embodiment of the utility model, a circulating water system is also provided, and the circulating water system includes the above-mentioned sewage sedimentation device. Specifically, the circulating water system also includes a flocculant adding device, an overflow device, a circulating water system and a wastewater cooling device connected in sequence. The black water discharged after participating in the coal gasification reaction is added with flocculant in the flocculant adding device and introduced into the overflow device. The upper clear liquid and low-pressure circulating water in the overflow device enter the circulating water tank 10 through the feed pipeline 111 and the circulating water inlet 11, and are discharged to the wastewater cooling device after coagulation to ensure the stability of water quality, or are passed back to the coal gasification system to continue to participate in the reaction, thereby reducing the waste of water resources. The circulating water system provided by the present application can reduce the risk of scaling of low-pressure circulating water in the coal gasification system, reduce scaling of pipelines, heat exchange equipment, and cooling equipment, and thus avoid equipment damage and reduced operating efficiency due to excessively thick scale layers.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0042] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0043] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0044] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0045] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0046] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A sewage sedimentation device, characterized in that: The sewage sedimentation device comprises: A circulating water tank (10) having a circulating water inlet (11), a circulating water outlet (12) and a wastewater outlet (13), wherein the circulating water inlet (11) is used to introduce low-pressure circulating water after participating in the coal gasification reaction, and the wastewater outlet (13) is used to communicate with a wastewater cooling device, and a wastewater pipeline (131) is provided between the wastewater outlet (13) and the wastewater cooling device; The feeding assembly (20) comprises a feeding unit (21), a first feeding pipeline (22) and a second feeding pipeline (23); the first feeding pipeline (22) is respectively connected to the feeding unit (21) and the circulating water tank (10); the first feeding pipeline (22) is used to introduce a dispersant into the circulating water tank (10); one end of the second feeding pipeline (23) is connected to the first feeding pipeline (22); the other end of the second feeding pipeline (23) is connected to the wastewater pipeline (131) so as to introduce the dispersant into the circulating water in the wastewater pipeline (131) again.

2. The sewage sedimentation device according to claim 1, characterized in that: The feeding unit (21) comprises: A storage barrel (211), wherein the storage barrel (211) is used to contain a dispersant; A feed pump (212), wherein the feed pump (212) is connected to the material storage barrel (211) and the first material supply pipeline (22) respectively, and the feed pump (212) is located upstream of the connection between the first material supply pipeline (22) and the second material supply pipeline (23), and the feed pump (212) is used to pump the dispersant in the material storage barrel (211) into the first material supply pipeline (22) and the second material supply pipeline (23). A first control unit is provided between the feed pump (212) and the first material supply pipeline (22) to control the flow rate of the dispersant in the first material supply pipeline (22).

3. The sewage sedimentation device according to claim 2, characterized in that: The first control unit comprises: a first flow meter (213), the first flow meter (213) being used to detect the flow rate of the dispersant in the first supply pipeline (22); A first controller, wherein the first controller is electrically connected to the feed pump (212) and the first flow meter (213), respectively, and the first controller is capable of adjusting the flow rate of the dispersant pumped by the feed pump (212) to the first feed pipeline (22) according to the parameters of the first flow meter (213).

4. The sewage sedimentation device according to claim 3, characterized in that: The second feed pipeline (23) is provided with a second control unit, and the second control unit comprises: a second flow meter (221), the second flow meter (221) being used to detect the flow rate of the dispersant in the second feed pipeline (23); A second controller and an electrically controlled valve (222), wherein the second controller is electrically connected to the second flow meter (221) and the electrically controlled valve (222), respectively, and the second controller is capable of adjusting the flow rate of the dispersant in the second feed pipeline (23) according to the parameters of the second flow meter (221).

5. The sewage sedimentation device according to claim 3, characterized in that: The sewage settling device further comprises a feed pipeline (111), wherein the feed pipeline (111) is in communication with the circulating water inlet (11), and a third control unit is arranged on the feed pipeline (111), wherein the third control unit comprises: a third flow meter (112), the third flow meter (112) being used to detect the flow rate of the low-pressure circulating water in the feed pipeline (111); A third controller, wherein the third controller is electrically connected to the feed pump (212), the first flow meter (213) and the third flow meter (112), respectively, and the third controller is capable of comparing the parameters of the first flow meter (213) and the third flow meter (112) to adjust the flow rate of the dispersant pumped by the feed pump (212) to the first feed pipeline (22).

6. The sewage sedimentation device according to claim 1, characterized in that: The circulating water tank (10) has a mixing chamber, a circulating water pipe (14) is arranged in the mixing chamber, the circulating water pipe (14) has the circulating water inlet (11), and the circulating water pipe (14) comprises: A main line (141), wherein the main line (141) extends in a horizontal direction; A branch pipeline (142), wherein a plurality of branch pipelines (142) are provided, and the plurality of branch pipelines (142) are all connected to the main pipeline (141) and are arranged at intervals along the extension direction of the main pipeline (141).

7. The sewage sedimentation device according to claim 6, characterized in that: The circulating water pipe (14) further comprises an extension pipeline (143), one end of which is provided with the circulating water inlet (11), the other end of which is connected to the main line (141), the extension pipeline (143) extending in a height direction of the circulating water tank (10), and the circulating water inlet (11) being located above the main line (141).

8. The sewage sedimentation device according to claim 6, characterized in that: The sum of the flow areas of the plurality of branch pipelines (142) is less than or equal to the flow area of ​​the main pipeline (141).

9. The sewage sedimentation device according to claim 1, characterized in that: The top of the circulating water tank (10) is provided with a vent (15), the vent (15) being connected to the outside, and the vent (15) being used to balance the internal pressure of the circulating water tank (10).

10. A circulating water system, characterized in that: The circulating water system comprises the sewage settling device according to any one of claims 1 to 9.

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