Desanding system of hydrolysis acidification pool

Abstract

The invention relates to a desanding system of a hydrolysis acidification pool. The desanding system comprises a water distribution assembly, a sand setting assembly, a sand scraping assembly and a sand discharging assembly, the sand setting assembly is mounted in the hydrolysis acidification pool to form a sand setting area, the water distribution assembly is arranged above the sand setting assembly, and a plurality of sand scraping plates of the sand scraping assembly are uniformly distributed in the sand setting area; the sand discharging assembly is arranged below the sand setting area and communicates with a sand discharging opening of the sand setting area. A water inlet of the water distribution assembly is communicated with a sewage pipe, sewage can be uniformly discharged into the sand setting area through the water distribution assembly, mud and sand in the sand setting area are scraped and conveyed to the sand discharging opening through the sand scraping plate to enter the sand discharging assembly, and the mud and sand are discharged out of the hydrolysis acidification pool through the sand discharging assembly. The water distribution assembly, the sand setting assembly, the sand scraping assembly and the sand discharging assembly form a complete sand removing chain, and the sand removing effect is remarkably improved through the synergistic effect of all the assemblies. And the structure is simple, installation and maintenance are easy, the operation cost is low, and good economic benefits and environmental benefits are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, in particular to a hydrolysis acidification tank sand removal system. Background Art

[0002] At present, in the sewage treatment process, the hydrolysis acidification tank is an important treatment unit, and its function is to decompose the macromolecular organic matter in the sewage into small molecular organic matter and improve the biodegradability of the sewage. However, sewage usually contains a certain amount of impurities such as mud and sand. If these mud and sand accumulate in large quantities in the hydrolysis acidification tank, many problems will arise. On the one hand, the mud and sand will occupy the effective volume of the hydrolysis acidification tank and reduce the treatment capacity of the tank; on the other hand, too much mud and sand will affect the living environment and metabolic activities of microorganisms in the tank, thereby reducing the efficiency and effect of hydrolysis acidification. There are some shortcomings in the traditional sand removal method of the hydrolysis acidification tank, such as incomplete sand removal, resulting in a lot of mud and sand remaining; or the sand removal process is relatively complicated, requiring a lot of manpower, material resources and time costs, affecting the overall operation efficiency and economy of the sewage treatment system. Summary of the invention

[0003] 1. Technical issues to be resolved In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a hydrolysis acidification tank sand removal system, which solves the technical problems of the prior art that the sand removal effect is poor and the sand removal process is complicated, affecting the sewage treatment efficiency.

[0004] (II) Technical solution In order to achieve the above object, the main technical solutions adopted by the present invention include: The invention provides a sand removal system for a hydrolysis acidification tank, comprising a water distribution component, a sand settling component, a sand scraping component and a sand discharge component; the sand settling component is installed in the hydrolysis acidification tank to form a sand settling area, the water distribution component is arranged above the sand settling component, and a plurality of sand scraping plates of the sand scraping component are evenly distributed in the sand settling area; the sand discharge component is arranged below the sand settling area and is connected to a sand discharge port of the sand settling area; the water inlet of the water distribution component is connected to a sewage pipe, sewage can be evenly discharged into the sand settling area through the water distribution component, mud and sand in the sand settling area are scraped and sent to the sand discharge port and enter the sand discharge component through the sand scraping plate, and mud and sand are discharged from the hydrolysis acidification tank through the sand discharge component.

[0005] Optionally, the water distribution assembly includes a circular water inlet pipe and multiple water distribution branch pipes; the water inlet of the circular water inlet pipe is connected to the sewage pipe; both ends of the water distribution branch pipe are connected to the circular water inlet pipe and the sand scraping drive mechanism of the sand scraping assembly, and the multiple water distribution branch pipes are evenly distributed in the shape of wheel spokes between the circular water inlet pipe and the sand scraping drive mechanism; the bottom of the water distribution branch pipe is evenly provided with multiple water outlets along its length.

[0006] Optionally, the diameter of the water distribution branch pipe gradually decreases along the water flow direction, and the diameter ratio of the head end to the tail end of the water distribution branch pipe is 1.2 to 1.5:1.

[0007] Optionally, the water outlet is a slit-type structure, the length direction of which forms an angle of 50° to 60° with the axis of the water distribution branch pipe, the width of the water outlet is 5 to 8 mm, and the distance d between adjacent water outlets satisfies d = 0.8vt, where v is the designed flow velocity and t is the sedimentation time threshold of sand particles.

[0008] Optionally, the sand settling component includes a plurality of sand settling plates; the plurality of sand settling plates are arranged circumferentially along the hydrolysis acidification tank to form an inverted frustum-shaped sand settling area; the angle between the outer side of the sand settling plate and the horizontal plane is 25° to 35°.

[0009] Optionally, the sand discharging component includes a sand collecting hopper, a sand discharging valve and a sand discharging pipe; the sand inlet of the sand discharging pipe is communicated with the sand discharging port of the sand settling area through the sand collecting hopper, and the sand discharging valve is arranged at the connection of the sand discharging pipe and the sand collecting hopper.

[0010] Optionally, the sand removal system further includes a controller and a data acquisition component; the signal output end of the data acquisition component is connected to the signal input end of the controller; the signal output end of the controller is connected to the water distribution component, the sand scraping component and the sand discharging component; the data acquisition component includes a sand settling monitor and a sand volume monitor; the sand settling monitor is arranged on the sand settling component, and the sand volume monitor is arranged on the sand discharging component.

[0011] Optionally, the controller dynamically adjusts the sand scraping frequency f according to the sand volume signal fed back by the sand volume monitor, satisfying: .

[0012] where K is a proportionality coefficient, and its value range is 0.8 to 1.2, W t is the real-time sand volume, and W0 is the reference sand volume.

[0013] Optionally, the controller proportionally adjusts the flow rate of the water distribution component according to the difference between the real-time data of the sand settling amount and the preset threshold, satisfying: .

[0014] where Q 实际 is the real-time flow rate of the water distribution component; Q 设计 is the initial designed flow rate; α is the flow rate attenuation coefficient, and its value range is 0.1 to 0.3; S is the real-time monitored sand settling amount in the sand settling area; S0 is the designed threshold of the sand settling amount.

[0015] Optionally, when the sand settling amount S > S0, the controller synchronously reduces the flow rate of the water distribution component and adjusts the sand scraping component, and the rotation speed of the sand scraping plate satisfies: .

[0016] Wherein, n is the real-time rotation speed of the sand scraping plate; n0 is the reference rotation speed of the sand scraping plate; β is the sand scraping plate compensation coefficient, and its value range is 0.2 - 0.4.

[0017] (III) Beneficial Effects The beneficial effects of the present invention are as follows: A sand removal system for a hydrolysis acidification tank provided by the present invention, in which the water distribution component is arranged above the sand sedimentation component, can evenly cover the sand sedimentation area with sewage, create a stable flow field for subsequent sand sedimentation, make sand grains more likely to settle in the sand sedimentation area, avoid the problems of short circuit flow and eddy current caused by traditional single-point water distribution, improve the uniformity of the water flow velocity in the sand sedimentation area, reduce the sedimentation blind area of sediment in the tank, and improve the sand sedimentation efficiency. The sand sedimentation component forms an independent sand sedimentation area in the hydrolysis acidification tank, and the sand sedimentation area can increase the sand grain sedimentation area and achieve efficient separation of sand grains and water phase by using the density difference. Multiple sand scraping plates are evenly distributed in the sand sedimentation area, fitting the bottom of the tank and the surface of the sand sedimentation area, and scraping the precipitated sand grains to the sand discharge port of the sand sedimentation area in a directional manner, with high sand cleaning efficiency. The sand discharge component is connected to the sand discharge port of the sand sedimentation area and realizes gravity-driven or low-power discharge by using the gravity of sand grains. Compared with the prior art, its water distribution component, sand sedimentation component, sand scraping component and sand discharge component form a complete sand removal chain, and each component works together: uniform water distribution → efficient sand sedimentation → thorough sand scraping → precise sand discharge, significantly improving the sand removal effect, reducing the impact of sediment on microorganisms in the hydrolysis acidification tank, improving the effect of hydrolysis acidification, thereby enhancing the treatment capacity and effluent quality of the sewage treatment system; moreover, it has a simple structure, is easy to install and maintain, has a low operation cost, has good economic and environmental benefits, and can be widely applied to sewage treatment plants and industrial wastewater treatment fields of various scales. Description of the Drawings

[0018] Figure 1 is the overall structural schematic diagram of a sand removal system for a hydrolysis acidification tank according to Embodiment 1 of the present invention; Figure 2 is the structural top view of a sand sedimentation area and a scraper assembly according to Embodiment 1 of the present invention; Figure 3 is the structural schematic diagram of the water distribution component according to Embodiment 1 of the present invention; Figure 4 is the structural schematic diagram of the water distribution branch pipe according to Embodiment 1 of the present invention; Figure 5 is the connection relationship diagram of the controller according to Embodiment 1 of the present invention.

[0019]

Description of the Reference Numerals

[0020] In order to better understand the above technical solution, the exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and the scope of the present invention can be completely conveyed to those skilled in the art.

[0021] Embodiment 1:

[0022] As Figure 1 shown, the detailed implementation manner of the present invention provides a sand removal system for a hydrolysis acidification tank, including a water distribution component, a sand sedimentation component, a sand scraping component and a sand discharging component; the sand sedimentation component is installed in the hydrolysis acidification tank 1 to form a sand sedimentation area 2, the water distribution component is arranged above the sand sedimentation component, and a plurality of sand scraping plates 31 of the sand scraping component are evenly distributed in the sand sedimentation area; the sand discharging component is arranged below the sand sedimentation area 2 and communicates with the sand discharging port of the sand sedimentation area 2; the water inlet of the water distribution component communicates with the sewage pipe, and through the water distribution component, sewage can be evenly discharged into the sand sedimentation area 2. The sand and sediment in the sand sedimentation area 2 are scraped by the sand scraping plate 31 to the sand discharging port and enter the sand discharging component, and the sand and sediment are discharged from the hydrolysis acidification tank 1 through the sand discharging component. In this embodiment, the sand scraping plate 31 is made of rubber and has a certain flexibility, and the sand scraping plate 31 can closely adhere to the surface of the sand sedimentation area 2 for sand scraping operation.

[0023] Specifically, the water distribution component is arranged above the sand sedimentation component, which can evenly cover the sand sedimentation area 2 with sewage, create a stable flow field for subsequent sand sedimentation, make sand grains more likely to settle in the sand sedimentation area 2, avoid the problems of short flow and vortex caused by traditional single-point water distribution, improve the uniformity of the water flow velocity in the sand sedimentation area 2, reduce the sedimentation blind area of sand and sediment in the tank, and improve the sand sedimentation efficiency. The sand sedimentation component forms an independent sand sedimentation area 2 in the hydrolysis acidification tank 1, and the sand sedimentation area 2 can increase the sand grain sedimentation area and realize the efficient separation of sand grains and water phase by using the density difference. A plurality of sand scraping plates 31 are evenly distributed in the sand sedimentation area 2, fit the bottom of the tank and the surface of the sand sedimentation area 2, and scrape the deposited sand grains to the sand discharging port of the sand sedimentation area 2 with high sand cleaning efficiency. The sand discharging component communicates with the sand discharging port of the sand sedimentation area 2 and realizes the discharge without power or with low power by using the gravity of sand grains. Compared with the prior art, its water distribution component, sand sedimentation component, sand scraping component and sand discharging component form a complete sand removal chain, and each component works together: evenly distributing water → efficiently sedimenting sand → thoroughly scraping sand → precisely discharging sand, significantly improving the sand removal effect, reducing the impact of sand and sediment on microorganisms in the hydrolysis acidification tank 1, improving the effect of hydrolysis acidification, thereby enhancing the treatment capacity and effluent quality of the sewage treatment system; moreover, the structure is simple, easy to install and maintain, with low operating cost, having good economic and environmental benefits, and can be widely applied to sewage treatment plants and industrial wastewater treatment fields of various scales.

[0024] Furthermore, if Figure 3 As shown, the water distribution assembly includes a circular water inlet pipe 41 and a plurality of water distribution branches 42; the water inlet of the circular water inlet pipe 41 is connected to the sewage pipe; the two ends of the water distribution branch pipe 42 are connected to the circular water inlet pipe 41 and the sand scraping drive mechanism 32 of the sand scraping assembly, and the plurality of water distribution branches 42 are evenly distributed in the shape of wheel spokes between the circular water inlet pipe 41 and the sand scraping drive mechanism 32; the bottom of the water distribution branch pipe 42 is evenly provided with a plurality of water outlets 43 along its length. The spoke-shaped distribution covers the entire circumference of the sand settling area 2, and the water outlets 43 are evenly arranged along the length of the branch pipe to ensure that the sewage forms a uniform laminar flow on the surface of the sand settling area 2 and reduce turbulent disturbance. The two ends of the water distribution branch pipe 42 are respectively connected to the circular water inlet pipe 41 and the sand scraping drive mechanism 32 to form an annular truss structure, which has both water distribution and support functions and resists water flow impact vibration. The sand scraping drive mechanism 32 is connected to the sand scraping plate 31 to drive the sand scraping plate 31 to rotate circumferentially along the sand settling area 2 to scrape mud and sand.

[0025] Furthermore, in this embodiment, the head loss along the way is offset by gradually changing the pipe diameter to ensure that the flow rates of the water outlets 43 of the water distribution branch pipe 42 are consistent, and the verification formula is: .

[0026] Among them, Q i is the flow rate of the i-th water distribution branch pipe 42, indicating the water discharge capacity of a certain water distribution branch pipe 42. i Make each water distribution branch pipe 42Q i Close to the same, to ensure uniform water distribution. i is the diameter of the i-th water distribution branch pipe 42. The diameter of the water distribution branch pipe 42 gradually decreases along the water flow direction. By changing D i Adjust the flow rate and resistance to offset the pressure drop along the way. g is the acceleration of gravity; H is the total effective water head of the water distribution component; f is the resistance coefficient along the way; L is the length of the water distribution branch pipe 42; ∑ξ is the sum of all local resistance coefficients in the water distribution branch pipe 42. The optimized diameter ratio of the water distribution branch pipe 42 is verified to be 1.2~1.5:1. Exceeding this range will result in too low flow rate at the head end (sand deposition) or too large pressure drop at the end (uneven water distribution).

[0027] Furthermore, if Figure 4As shown, the water outlet 43 has a slit structure, and the length direction thereof forms an angle of 50° - 60° with the axis of the water distribution branch pipe 42. The width of the water outlet 43 is preferably 5 - 8 mm, and the distance d between adjacent water outlets 43 satisfies d = 0.8vt, where v is the designed flow velocity and t is the sedimentation time threshold of sand grains. The inclination angle of the water outlet 43 causes the water flow to enter the grit chamber 2 tangentially, inducing the water flow to form a slow swirl, and extending the sedimentation path of sand grains (the swirl centrifugal force assists in sand grain separation). The slit width is designed to be larger than the common sand grain size, and the distance between adjacent slits satisfies dynamic design, which can not only ensure the water distribution uniformity but also avoid water flow interference caused by too small a distance and reduce the blockage probability.

[0028] Further, as Figure 1 and Figure 2 shown, the grit component includes a plurality of grit plates 21; the plurality of grit plates 21 are arranged circumferentially along the hydrolysis acidification tank 1 to form an inverted frustum-shaped grit chamber 2; the sand discharge port is opened on any one of the grit plates 21; the outer side of the grit plate 21 forms an angle of 25° - 35° with the horizontal plane. The upper cross-sectional area of the inverted frustum structure is large, which meets the sewage diffusion requirement; the lower cross-sectional area is small, which concentrates sand grains for convenient sand discharge and has a high volume utilization rate. In this embodiment, the grit plate 21 is made of a special hydrophilic material, and its surface has a certain roughness, which is beneficial to the adhesion and precipitation of sediment particles.

[0029] Further, as Figure 1 shown, the sand discharge component includes a sand collecting hopper 51, a sand discharge valve 52, and a sand discharge pipe 53; the sand inlet of the sand discharge pipe 53 is connected to the sand discharge port of the grit chamber 2 through the sand collecting hopper 51, and the sand discharge valve 52 is arranged at the connection between the sand discharge pipe 53 and the sand collecting hopper 51. In this embodiment, the sand collecting hopper 51 can accelerate the convergence of sand grains under the action of gravity, improve the sand discharge efficiency, and reduce sediment residue. The on-demand sand discharge is realized through the sand discharge valve 52.

[0030] Further, as Figure 5 shown, in this embodiment, the sand removal system further includes a controller 61 and a data acquisition component; the signal output end of the data acquisition component is connected to the signal input end of the controller 61; the signal output end of the controller 61 is connected to the water distribution component, the sand scraping component, and the sand discharge component; the data acquisition component includes a grit monitor 62 and a sand volume monitor 63; the grit monitor 62 is arranged on the grit component, and the sand volume monitor 63 is arranged on the sand discharge component. Specifically, in this embodiment, the water distribution component further includes a flow control valve 44, and the signal output end of the controller 61 is connected to the flow control valve 44; the signal output end of the controller 61 is connected to the sand scraping driving mechanism 32 of the sand scraping component; the signal output end of the controller 61 is connected to the sand discharge valve 52 of the sand discharge brush component; the grit monitor 62 is arranged on the grit plate 21, and the sand volume monitor 63 is arranged in the sand collecting hopper 51.

[0031] Further, in this embodiment, the controller 61 dynamically adjusts the sand scraping frequency f according to the sand quantity signal fed back by the sand quantity monitor 63, satisfying: .

[0032] where K is a proportionality coefficient with a value range of 0.8 to 1.2, W t is the real-time sand quantity, and W0 is the reference sand quantity. The exponential term is used to achieve the non-linear matching between the sand scraping frequency and the sand quantity, avoiding the over-regulation caused by the linear relationship. The exponent is set to 0.6 to adapt to the characteristics of the sand layer accumulation that is fast first and then slow (the sand quantity increases rapidly in the initial stage and requires a rapid response, while the sand layer becomes dense in the later stage and needs to be stably removed). Based on the ratio of W t / W0, the growth trend of the sand layer is predicted, and the frequency is adjusted in advance to reduce the risk of the sand discharge port being blocked.

[0033] Further, in this embodiment, the controller 61 adjusts the flow rate of the water distribution component proportionally according to the difference between the real-time data of the sediment quantity and the preset threshold, satisfying: .

[0034] where Q 实际 is the real-time flow rate of the water distribution component; Q 设计 is the initial design flow rate; α is the flow rate attenuation coefficient with a value range of 0.1 to 0.3; S is the sediment quantity monitored in real time in the sedimentation area 2; S0 is the designed threshold of the sediment quantity. When the sediment quantity S approaches the designed threshold S0, the influent flow rate Q 实际 is reduced proportionally by the flow rate attenuation coefficient α, reducing the input of new sand and avoiding the sediment overflowing over the scraping plate 31 or the scraping plate 31 being stuck due to the instantaneous load in the sedimentation area 2 being too high. The reduction of the flow rate can reduce the water flow shear force in the sedimentation area 2, prevent the secondary scouring and suspension of the fine sand that has already settled, and ensure the stable effluent quality.

[0035] Further, in this embodiment, when the sediment quantity S > S0, the controller 61 synchronously reduces the flow rate of the water distribution component and adjusts the scraping component, and the rotation speed of the scraping plate 31 satisfies: .

[0036] where n is the real-time rotation speed of the scraping plate 31; n0 is the reference rotation speed of the scraping plate 31; β is the compensation coefficient of the scraping plate 31 with a value range of 0.2 to 0.4. The compensation coefficient β of the scraping plate 31 is used to enhance the sand discharge intensity and quickly remove the accumulated sand layer. The rotation speed has a linear relationship with the proportion of the sediment quantity exceeding the threshold, ensuring the matching between the driving force of the scraping plate 31 and the degree of sand layer accumulation.

[0037] Embodiment 2: This embodiment provides a sand removal method for the sand removal system of the hydrolysis acidification tank described in Embodiment 1, including the steps: S1. Before the sewage enters the circular inlet pipe 41, the sewage is pre-treated and filtered to intercept large-particle debris, prevent the slit from being blocked, reduce the maintenance frequency of the water distribution branch pipe 42 caused by debris jamming, avoid uneven water distribution caused by slit blockage, and indirectly ensure the uniform water flow in the grit chamber 2. Among them, according to the design flow rate Q 设计 = 500 m³ / h, the total inlet pressure is set so that the outlet velocity of the slit is 1.0 ± 0.2 m / s, and the water forms a swirling angular velocity of 0.5 - 1.2 rad / s after flowing through the slit with an inclination angle of 50° - 60°.

[0038] S2. The flow control valve 44 of the water distribution component is opened through the controller 61, and the sewage enters the circular inlet pipe 41 and diffuses into the hydrolysis acidification tank 1 through the water distribution branch pipes 42 evenly distributed in a radial shape. The sewage enters the grit chamber 2 from the slit-type water outlet 43 at the bottom of the water distribution branch pipe 42.

[0039] S3. The sediment carried by the sewage settles in the inverted frustum-shaped grit chamber 2. The grit monitor 62 monitors the thickness of the sediment in the grit chamber 2 in real time. The controller 61 adjusts the flow rate of the water distribution component proportionally according to the difference between the real-time data of the sediment volume and the preset threshold. When the sediment thickness exceeds the sediment threshold, the controller 61 starts the scraping drive mechanism 32. The scraping drive mechanism 32 drives a plurality of scraping plates 31 to rotate circumferentially along the grit chamber 2 to scrape the sediment in the grit chamber 2 to the sand discharge port and fall into the sand collecting hopper 51 of the sand discharge component. The controller 61 dynamically adjusts the scraping frequency f according to the sand quantity signal fed back by the sand quantity monitor 63 in the sand collecting hopper 51.

[0040] S4. The controller 61, according to the sand quantity in the sand collecting hopper 51 monitored by the sand quantity monitor 63 in real time, when the sand quantity reaches the set volume, the controller 61 opens the sand discharge valve 52, and the sediment is discharged along the sand discharge pipe 53 under the action of gravity.

[0041] Specifically, through the full-process control of pre-treatment for anti-blocking - intelligent water distribution - dynamic sand scraping - precise sand discharge, the comprehensive improvement of sand removal efficiency, operation reliability, and energy conservation is realized. Especially, significant technical advantages are formed in terms of anti-blocking and precise control, meeting the urgent needs of the sewage treatment industry for high-efficiency and low-consumption sand removal technology.

[0042] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0043] In the present invention, unless otherwise clearly defined or limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium; it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly defined or limited, when the first feature is "on" or "under" the second feature, it may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, when the first feature is "above", "over" and "on top of" the second feature, it may be that the first feature is directly above or obliquely above the second feature, or it merely means that the horizontal height of the first feature is higher than that of the second feature. When the first feature is "under", "beneath" and "underneath" the second feature, it may be that the first feature is directly below or obliquely below the second feature, or it merely means that the horizontal height of the first feature is lower than that of the second feature.

[0045] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0046] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A sand removal system for a hydrolysis acidification tank, characterized in that it includes a water distribution component, a sand sedimentation component, a sand scraping component and a sand discharging component; The sand sedimentation component is installed in the hydrolysis acidification tank (1) to form a sand sedimentation area (2). The water distribution component is arranged above the sand sedimentation component. Multiple scraping plates (31) of the sand scraping component are evenly distributed in the sand sedimentation area. The sand discharging component is arranged below the sand sedimentation area (2) and communicates with the sand discharging port of the sand sedimentation area (2); The water inlet of the water distribution component is connected to the sewage pipe. Through the water distribution component, sewage can be evenly discharged into the sand sedimentation area (2). The sediment in the sand sedimentation area (2) is scraped by the scraping plate (31) to the sand discharging port and enters the sand discharging component. The sediment is discharged from the hydrolysis acidification tank (1) through the sand discharging component.

2. The sand removal system for a hydrolysis acidification tank according to claim 1, characterized in that the water distribution component includes a circular water inlet pipe (41) and multiple water distribution branch pipes (42); The water inlet of the circular water inlet pipe (41) is connected to the sewage pipe. Both ends of the water distribution branch pipe (42) are connected to the circular water inlet pipe (41) and the sand scraping driving mechanism (32) of the sand scraping component. Multiple water distribution branch pipes (42) are evenly distributed in a spoke-like manner between the circular water inlet pipe (41) and the sand scraping driving mechanism (32). Multiple water outlets (43) are evenly arranged along the length direction of the bottom of the water distribution branch pipe (42).

3. The sand removal system for a hydrolysis acidification tank according to claim 2, characterized in that the diameter of the water distribution branch pipe (42) gradually decreases along the water flow direction, and the diameter ratio of the head end to the tail end of the water distribution branch pipe (42) is 1.2 - 1.5:

1.

4. The sand removal system for a hydrolysis acidification tank according to claim 2, characterized in that the water outlet (43) is of a slit-like structure, and the angle between its length direction and the axis of the water distribution branch pipe (42) is 50° - 60°. The width of the water outlet (43) is 5 - 8 mm, and the distance d between adjacent water outlets (43) satisfies d = 0.8vt, where v is the designed flow velocity and t is the sedimentation time threshold of sand particles.

5. The sand removal system for a hydrolysis acidification tank according to claim 1, characterized in that the sand sedimentation component includes multiple sand sedimentation plates (21); Multiple sand sedimentation plates (21) are arranged along the circumferential direction of the hydrolysis acidification tank (1) to form an inverted frustum-shaped sand sedimentation area (2); The angle between the outer side of the sand sedimentation plate (21) and the horizontal plane is 25° - 35°.

6. The sand removal system for a hydrolysis acidification tank according to claim 1, characterized in that the sand discharging component includes a sand collecting hopper (51), a sand discharging valve (52) and a sand discharging pipe (53); The sand inlet of the sand discharging pipe (53) is connected to the sand discharging port of the sand sedimentation area (2) through the sand collecting hopper (51), and the sand discharging valve (52) is arranged at the connection between the sand discharging pipe (53) and the sand collecting hopper (51).

7. The sand removal system for a hydrolysis acidification tank according to claim 1, characterized in that it further includes a controller (61) and a data acquisition component; The signal output end of the data acquisition component is connected to the signal input end of the controller (61); The signal output end of the controller (61) is connected to the water distribution component, the sand scraping component and the sand discharging component; The data acquisition component includes a sand sedimentation monitor (62) and a sand volume monitor (63); The grit monitor (62) is arranged on the grit component, and the sand volume monitor (63) is arranged on the sand discharging component.

8. The hydrolysis acidification tank sand removal system according to claim 7, wherein The controller (61) dynamically adjusts the scraping frequency f according to the sand volume signal fed back by the sand volume monitor (63) to satisfy: ； Among them, K is a proportionality coefficient, and its value range is 0.8 to 1.2, W t is the real-time sand volume, and W0 is the reference sand volume.

9. The hydrolysis acidification tank sand removal system according to claim 7, wherein The controller (61) proportionally adjusts the flow rate of the water distribution component according to the difference between the real-time data of the grit volume and the preset threshold value to satisfy: ； Among them, Q 实际 is the real-time flow rate of the water distribution component; Q 设计 is the initial design flow rate; α is the flow rate attenuation coefficient, and the value range is 0.1 to 0.3; S is the amount of sediment monitored in real time in the sedimentation area (2); S0 is the design threshold of the sediment amount.

10. The hydrolysis acidification tank sand removal system according to claim 9, wherein When the grit volume S > S0, the controller (61) synchronously reduces the flow rate of the water distribution component and adjusts the scraping component, and the rotation speed of the scraping plate (31) satisfies: ； wherein, n is the real-time rotation speed of the scraping plate (31); n0 is the reference rotation speed of the scraping plate (31); β is the compensation coefficient of the scraping plate (31), and the value range is 0.2 to 0.4.

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