A three-phase separator for an anaerobic tank

Abstract

The utility model discloses a three -phase separator for anaerobic jar belongs to sewage treatment technical field. The three -phase separator includes two layer gas collecting cover of up and down arrangement, is equipped with the fairing between upper gas collecting cover and lower gas collecting cover, the lower gas collecting cover is arranged in the middle line below adjacent two fairings, and the upper gas collecting cover is arranged above the upper mouth of fairing, the lower edge of upper gas collecting cover and lower gas collecting cover all is equipped with the flanging of edge, and the direction of flanging of edge is vertical direction. When using, the biogas rises and gathers to the gas collecting cover in the inner inclined wall of fairing, under the action of biogas lift, the biogas liquid enters the fairing top and carries out the subsidence under the gap between the fairing upper end and upper gas collecting cover below the fairing. The particle sludge that subsides falls along the outer inclined wall of fairing, and the gap between the fairing lower end and lower gas collecting cover is flowed back to the reaction area of anaerobic jar lower part, and the biogas liquid forms microcirculation in the fairing, and the particle sludge subsidence reflux channel and biogas liquid upflow channel do not interfere with each other, and the particle sludge subsidence condition is good.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to a three-phase separator for anaerobic tanks. Background Technology

[0002] Currently, anaerobic digesters are often used to treat high-concentration organic wastewater in wastewater treatment processes. The upper part of the anaerobic digester is equipped with a solid-liquid-gas three-phase separator. The anaerobic granular sludge is carried by the biogas bubbles it generates. Since the specific gravity is less than that of water, it rises and touches the gas collection hood of the three-phase separator. The biogas bubbles separate from the granular sludge, and the biogas enters the gas box along the gas collection hood. The granular sludge settles under the action of gravity, thereby achieving the purpose of solid-liquid-gas three-phase separation.

[0003] Existing technologies often employ a five-layer gas collection hood symmetrical three-phase separator, the specific configuration of which is shown in the attached diagram of the instruction manual. Figure 1 As shown, one of the gas collection hoods is located on the midline between two adjacent gas collection hoods above or below it. The five-layer symmetrical three-phase separator has a slow gas, water and sludge separation speed. When the anaerobic tank volume load is high, biogas and sludge may overflow the three-phase separator, resulting in the loss of biogas and granular sludge.

[0004] Patent CN 212334743 U discloses a three-phase separator for an anaerobic digester, the specific setup of which is shown in the attached drawings of the specification. Figure 2 As shown, this three-phase separator, while maintaining the same coverage area of ​​the gas collection hoods, uses an asymmetrical arrangement of five gas collection hoods. This lengthens the flow path of the gas, water, and sludge mixture through the three-phase separator, and the flow velocity through each layer is forcibly changed by the asymmetrical structure, thereby accelerating the separation speed of gas, water, and sludge. The improved anaerobic tank three-phase separator has a 15-20% higher separation performance. However, this device still uses five gas collection hoods, so there is no saving in material usage; the gap width between adjacent gas collection hoods at the same height remains unchanged, and the upflow velocity of the biogas slurry through the gap remains unchanged. Under high hydraulic loads in the anaerobic tank, granular sludge can still be lost. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a three-phase separator for anaerobic digesters. The three-phase separator provided by this invention has only a three-layer structure, saving space.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] The first aspect of this utility model is to provide a three-phase separator for an anaerobic tank, comprising two gas collecting hoods arranged vertically, with a flow guide hood provided between the upper and lower gas collecting hoods.

[0008] The lower gas collection hood is positioned on the center line below two adjacent guide hoods, and the upper gas collection hood is positioned above the upper opening of the guide hood;

[0009] The lower edges of both the upper and lower gas collecting hoods are provided with folded edges, and the direction of the folded edges is vertical.

[0010] In some embodiments of this utility model, the width of the lower gas collecting hood is greater than the gap width between two adjacent flow guide hoods; the width of the upper gas collecting hood is greater than the width of the upper opening of the flow guide hood.

[0011] In some embodiments of this utility model, the gap width between two adjacent air guides is 180-220mm; the width of the upper opening of the air guide is 130-170mm.

[0012] In some embodiments of this utility model, the height of the air guide shroud is 1.9-2.1 times the height of the lower or upper air collection shroud.

[0013] In some embodiments of this utility model, the air deflector is arranged in a figure-eight shape, and two air deflector plates form a figure-eight air deflector.

[0014] In some embodiments of this utility model, the upper and lower edges of the flow guide are provided with folded edges, and the direction of the folded edges is vertical.

[0015] In some embodiments of this utility model, the height of the folded edge is 50-100mm.

[0016] In some embodiments of this utility model, the angle between the upper gas collecting hood, the guide hood, and the lower gas collecting hood and the horizontal plane is 55-60°.

[0017] In some embodiments of this utility model, the angle between the upper gas collecting hood, the guide hood, and the lower gas collecting hood and the horizontal plane is 55°.

[0018] In some embodiments of this utility model, the sum of the gap areas between the lower gas collecting hoods or the sum of the gap areas between the upper gas collecting hoods accounts for 65-70% of the projected area of ​​the three-phase separator.

[0019] The various embodiments of this utility model can be combined arbitrarily as needed, and the resulting embodiments are also within the scope of this utility model and are part of the specific implementation of this utility model.

[0020] The beneficial effects of this utility model are as follows:

[0021] The three-phase separator provided by this utility model allows the collected biogas to rise along the inner inclined wall of the guide hood 4 until it converges into the upper gas collection hood 5. Under the lift of the biogas, the biogas slurry enters the area below the guide hood 4 through the gap between the upper end of the guide hood 4 and the upper gas collection hood 5. The area above the guide hood 4 is a settling zone. The settled granular sludge falls along the outer inclined wall of the guide hood 4 and flows back to the reaction zone at the bottom of the anaerobic tank through the gap between the lower end of the guide hood 4 and the lower gas collection hood 3. That is, the biogas slurry forms a micro-circulation inside and outside the guide hood 4. The granular sludge settling return channel and the biogas slurry rising channel do not interfere with each other, resulting in good granular sludge settling conditions.

[0022] The three-phase separator of this invention, by setting this side at the lower edge of the gas collection hood, fully and thoroughly collects biogas, improves the biogas collection rate, prevents biogas from leaking out at both ends of the gas collection hood, and ensures a better liquid-gas separation effect.

[0023] The three-phase separator of this invention increases the proportion of the gap area between the lower gas collecting hoods or the gap area between the upper gas collecting hoods to the projected area of ​​the three-phase separator by adjusting the width of the gas collecting hood and the size of the flow guide hood. This reduces the flow velocity through the gap, resulting in good settling conditions for granular sludge and ensuring a better liquid-solid separation effect.

[0024] In other words, the three-phase separator of this invention improves the separation effect of liquid and gas, and also improves the separation effect of liquid and solid. Attached Figure Description

[0025] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0026] Figure 1 This is a schematic diagram of a symmetrical three-phase separator with a five-layer gas collection hood in the prior art.

[0027] Figure 2 This is a schematic diagram of the structure of an asymmetric three-phase separator with a five-layer gas collection hood in the prior art.

[0028] Figure 3 This is a schematic diagram of the structure of the three-phase separator used in the anaerobic tank in an embodiment of this utility model.

[0029] Among them, 1-three-phase separator, 2-gas collection hood, 3-lower gas collection hood, 4-guide hood, 5-upper gas collection hood, 6-folded edge, 7-guide plate. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without novelty are within the protection scope of the present utility model.

[0031] like Figure 3 As shown, this utility model provides a three-phase separator for an anaerobic tank, wherein the three-phase separator 1 includes a lower gas collection hood 3, a flow guide hood 4, and an upper gas collection hood 5.

[0032] The three-phase separator 1 has a three-layer structure, including two gas collecting hoods arranged vertically, with a flow guide 4 installed between the two gas collecting hoods; that is, a flow guide 4 is installed between the upper gas collecting hood 5 and the lower gas collecting hood 3. Specifically, the three-layer structure is compared to... Figure 1 , Figure 2 The five-layer structure reduces the overall height of the three-phase separator, saving space. The saved space is then used to increase the reaction zone at the bottom of the anaerobic reactor, thereby improving the anaerobic fermentation efficiency. At the same time, it also saves on the amount of separator material used and reduces manufacturing costs.

[0033] The lower gas collecting hood 3 is positioned on the center line below two adjacent guide hoods 4, and the upper gas collecting hood 5 is positioned above the upper opening of the guide hood 4. Specifically, the three-phase separator provided by this utility model is a symmetrical three-phase separator, with the lower gas collecting hood 3 positioned on the center line below two adjacent guide hoods 4, and the upper gas collecting hood 5 positioned above the upper opening of the guide hood 4. However, the upper gas collecting hood 5, the lower gas collecting hood 3, and the guide hood 4 are not completely fixedly connected, but rather have gaps. That is, there is a gap between the upper end of the guide hood 4 and the upper gas collecting hood 5 for the passage of biogas slurry, and there is a gap between the lower end of the guide hood 4 and the lower gas collecting hood 3 for the passage of granular sludge.

[0034] Both the upper gas collecting hood 5 and the lower gas collecting hood 3 have folded edges 6 at their lower edges, and the folded edges 6 are oriented vertically. Specifically, the folded edges 6 have a reinforcing function, improving the biogas collection efficiency inside the gas collecting hood and preventing the biogas collected inside the gas collecting hood from leaking from both ends of the gas collecting hood.

[0035] The three-phase separator provided by this invention is suitable for anaerobic tanks, and especially for side-flow circulating anaerobic reactors. That is, the flow direction of the mud-water mixture in the reaction zone is different from the direction of the mud-water mixture's upflow into the three-phase reactor.

[0036] The three-phase separator provided by this utility model allows the collected biogas to rise along the inner inclined wall of the guide hood 4 until it converges into the upper gas collection hood 5. Under the lift of the biogas, the biogas slurry enters the area below the guide hood 4 through the gap between the upper end of the guide hood 4 and the upper gas collection hood 5. The area above the guide hood 4 is a settling zone. The settled granular sludge falls along the outer inclined wall of the guide hood 4 and flows back to the reaction zone at the bottom of the anaerobic tank through the gap between the lower end of the guide hood 4 and the lower gas collection hood 3. That is, the biogas slurry forms a micro-circulation inside and outside the guide hood 4. The granular sludge settling return channel and the biogas slurry rising channel do not interfere with each other, resulting in good granular sludge settling conditions.

[0037] In some embodiments, the width of the lower gas collection hood 3 is greater than the gap width between two adjacent guide hoods 4; the width of the upper gas collection hood 5 is greater than the width of the upper opening of the guide hood 5, which facilitates the complete collection of biogas.

[0038] In some embodiments, the gap width between two adjacent air deflectors is the same as or similar to the width in the prior art, and the specific value can be determined according to actual needs. For example, it can be 180-220mm, specifically 180mm, 190mm, 200mm, 210mm, 220mm, etc.

[0039] In some embodiments, the width of the upper opening, the height, and the width of the air deflector are the same as or similar to those in the prior art, and the specific values ​​can be determined according to actual needs. For example, the width of the upper opening of the air deflector 4 can be 130-170mm, specifically 130mm, 140mm, 150mm, 160mm, 170mm, etc. The height of the air deflector 4 is 620-660mm, specifically 620mm, 630mm, 640mm, 650mm, 660mm, etc. The width of the air deflector 4 is 830-870mm, specifically 830mm, 840mm, 850mm, 860mm, 870mm, etc.

[0040] In some embodiments, the height and width of the lower gas collection hood 3 or the upper gas collection hood 5 are the same as or similar to those of the prior art, and the specific values ​​can be determined according to actual needs.

[0041] For example, the width of the lower gas collecting hood 3 can be 330-370mm, specifically 330mm, 340mm, 350mm, 360mm, 370mm, etc. The height of the lower gas collecting hood 3 can be 300-340mm, specifically 300mm, 310mm, 320mm, 330mm, 340mm, etc.

[0042] For example, the width of the upper gas collecting hood 5 can be 330-370mm, specifically 330mm, 340mm, 350mm, 360mm, 370mm, etc. The height of the upper gas collecting hood 5 can be 300-340mm, specifically 300mm, 310mm, 320mm, 330mm, 340mm, etc.

[0043] In some embodiments, the height of the air guide shroud is 1.9-2.1 times the height of the lower or upper air collection shroud, preferably 2 times.

[0044] In some embodiments, the guide hood 4 is arranged in a figure-eight shape, with two guide plates 7 forming the figure-eight guide hood 4. Specifically, the lower area of ​​the figure-eight guide hood 4 is the biogas slurry upflow zone, and the upper area of ​​the figure-eight guide hood 4 is the settling zone. Under the lift of biogas, the biogas slurry enters the settling zone from the lower area of ​​the figure-eight guide hood 4 through the gap between the upper gas collecting hood 5 and the guide hood 4. In the settling zone, the granular sludge in the biogas slurry settles. The settled granular sludge falls along the outer inclined wall of the guide hood 4 and flows back to the reaction zone at the bottom of the anaerobic tank through the gap between the guide hood 4 and the lower gas collecting hood 3. That is, the biogas slurry forms a micro-circulation inside and outside the guide hood 4, and the granular sludge settling return channel and the biogas slurry upflow channel do not interfere with each other, resulting in good granular sludge settling conditions.

[0045] In some embodiments, the upper and lower edges of the flow guide 4 are provided with folded edges 7, and the direction of the folded edges 7 is vertical.

[0046] In some embodiments, the height of the folded edge is 50-100mm, specifically 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, etc. The specific value can be determined according to actual needs.

[0047] In some embodiments, the angle between the upper gas collecting hood 5, the guide hood 4, and the lower gas collecting hood 3 and the horizontal plane is 55-60°, specifically 55°, 56°, 57°, 58°, 59°, 60°, etc. The specific values ​​can be determined according to actual needs.

[0048] In some embodiments, the angle between the upper gas collection hood, the flow guide hood, and the lower gas collection hood and the horizontal plane is 55°.

[0049] In some embodiments, while ensuring that the coverage area of ​​the three-phase separator remains unchanged, the sum of the gap areas between the lower gas collecting hoods or the sum of the gap areas between the upper gas collecting hoods accounts for 65-70% of the projected area of ​​the three-phase separator. This is an increase of 25-100% compared to the prior art, with a corresponding decrease in the interstitial flow velocity of 20-50%, resulting in better settling conditions for granular sludge.

[0050] It should be noted that the water flow direction in the anaerobic reactor is from bottom to top. Passing through the three-phase separator, the water can only flow through the gaps between the gas collecting hoods due to obstruction. The projected area of ​​this gap (considering its narrowest point) on the horizontal plane is the gap area. The water flow rate is constant; the larger the sum of the gap areas between the gas collecting hoods, the lower the water flow velocity; conversely, the smaller the sum of the gap areas between the gas collecting hoods, the higher the water flow velocity.

[0051] The three-phase separator provided by this utility model allows the collected biogas to rise along the inner inclined wall of the guide hood 4 until it converges into the upper gas collection hood 5. Under the lift of the biogas, the biogas slurry enters the area below the guide hood 4 through the gap between the upper end of the guide hood 4 and the upper gas collection hood 5. The area above the guide hood 4 is a settling zone. The settled granular sludge falls along the outer inclined wall of the guide hood 4 and flows back to the reaction zone at the bottom of the anaerobic tank through the gap between the lower end of the guide hood 4 and the lower gas collection hood 3. That is, the biogas slurry forms a micro-circulation inside and outside the guide hood 4. The granular sludge settling return channel and the biogas slurry rising channel do not interfere with each other, resulting in good granular sludge settling conditions. By adjusting the width of the gas collecting hood and the size of the flow guide hood 4, the proportion of the gap area between the lower gas collecting hoods 3 or the gap area between the upper gas collecting hoods 5 to the positive projection area of ​​the three-phase separator is increased, the flow velocity through the gap is reduced, the settling conditions of the granular sludge are good, and the liquid-gas separation effect and liquid-solid separation effect are guaranteed.

[0052] In other words, the three-phase separator of this invention improves the separation effect of liquid and gas, and also improves the separation effect of liquid and solid.

[0053] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be described in detail below with reference to specific embodiments.

[0054] Example 1

[0055] This utility model provides a three-phase separator 1, such as... Figure 3 As shown, the system includes a lower gas collection hood 3, a flow guide hood 4, and an upper gas collection hood 5. The lower gas collection hood 3 is arranged on the center line below two adjacent flow guide hoods 4, and the width of the lower gas collection hood 3 is greater than the gap width between the two adjacent flow guide hoods 4. The upper gas collection hood 5 is arranged directly above the flow guide hoods 4, and the width of the upper gas collection hood 5 is greater than the upper opening width of the flow guide hood 4.

[0056] The lower edge of the lower gas collecting hood 3, the upper and lower edges of the flow guide hood 4, and the lower edge of the upper gas collecting hood 5 are folded. The folded edge 6 is in the vertical direction and has a height of 70mm.

[0057] The width of both the lower gas collecting hood 3 and the upper gas collecting hood 5 is 350 mm. The height of both the lower gas collecting hood 3 and the upper gas collecting hood 5 is 320 mm. The gap width between two adjacent lower gas collecting hoods 3 or two adjacent upper gas collecting hoods 5 is 700 mm.

[0058] The upper opening of the air deflector 4 is 150mm wide, the height is 640mm, and the width is 850mm. The gap between two adjacent air deflectors is 200mm.

[0059] The included angle between the lower gas collecting hood 3, the guide hood 4, the upper gas collecting hood 5 and the horizontal plane is 55°.

[0060] In this embodiment of the three-phase separator, during use, the collected biogas rises along the inner inclined wall of the guide hood 4 until it converges into the upper gas collection hood 5. Under the lift of the biogas, the biogas slurry enters the area below the guide hood 4 through the gap between the upper end of the guide hood 4 and the upper gas collection hood 5. The area above the guide hood 4 is a settling zone. The settled granular sludge falls along the outer inclined wall of the guide hood 4 and flows back to the reaction zone at the bottom of the anaerobic tank through the gap between the lower end of the guide hood 4 and the lower gas collection hood 3. That is, the biogas slurry forms a micro-circulation inside and outside the guide hood 4. The granular sludge settling return channel and the biogas slurry rising channel do not interfere with each other, resulting in good granular sludge settling conditions and low sludge loss, thus ensuring good liquid-gas separation and liquid-solid separation effects.

[0061] It should be noted that the terms indicating direction in this article, such as inside and outside, are set according to the direction of the accompanying drawings in the instruction manual, and are only for the convenience of expression, and do not have any other specific meaning.

[0062] It should also be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or apparatus comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or apparatus that includes the aforementioned element.

[0063] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A three-phase separator for an anaerobic digester, characterized in that, It includes two layers of gas collection hoods arranged vertically, with a flow guide between the upper and lower gas collection hoods; The lower gas collection hood is positioned on the center line below two adjacent guide hoods, and the upper gas collection hood is positioned above the upper opening of the guide hood; The lower edges of both the upper and lower gas collecting hoods are provided with folded edges, and the direction of the folded edges is vertical.

2. The three-phase separator as described in claim 1, characterized in that, The width of the lower gas collecting hood is greater than the gap width between two adjacent flow guide hoods; the width of the upper gas collecting hood is greater than the width of the upper opening of the flow guide hood.

3. The three-phase separator as described in claim 1 or 2, characterized in that, The gap width between two adjacent air guides is 180-220mm; the width of the upper opening of the air guide is 130-170mm.

4. The three-phase separator as described in claim 1, characterized in that, The height of the air guide shroud is 1.9-2.1 times the height of the lower or upper air collection shroud.

5. The three-phase separator as described in claim 1, characterized in that, The fairing is arranged in a figure-eight shape, with two guide plates forming a figure-eight fairing.

6. The three-phase separator as described in claim 1, characterized in that, The upper and lower edges of the air guide are both provided with folded edges, and the folded edges are in the vertical direction.

7. The three-phase separator as described in claim 1 or 6, characterized in that, The height of the folded edge is 50-100mm.

8. The three-phase separator as described in claim 1, characterized in that, The angle between the upper gas collection hood, the guide hood, and the lower gas collection hood and the horizontal plane is 55-60°.

9. The three-phase separator as described in claim 8, characterized in that, The angle between the upper gas collection hood, the guide hood, and the lower gas collection hood and the horizontal plane is 55°.

10. The three-phase separator as described in claim 1, characterized in that, The sum of the gap areas between the lower gas collecting hoods or the sum of the gap areas between the upper gas collecting hoods accounts for 65-70% of the projected area of ​​the three-phase separator.

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