Sand and impurity removal system

Abstract

The utility model discloses a sand and impurity removal system. The system comprises a sedimentation tank with a V-shaped bottom; the sand collecting pit is arranged at one end of the sedimentation tank; the horizontal spiral sand discharging mechanism is used for conveying sediments at the bottom of the sedimentation tank to the sand collecting pit; the horizontal spiral sand discharging mechanism is arranged at the lowest position in the V-shaped sedimentation tank; the sand removing mechanism is connected with the sand collecting pit; a liquid outlet of the desanding mechanism is connected with the sedimentation tank; the floating spiral skimming mechanism is mounted at the water outlet end of the sedimentation tank; the scum squeezing mechanism is connected with the floating spiral skimming mechanism; a liquid outlet of the scum squeezing mechanism is connected with the sedimentation tank; the fine grid filtering mechanism is connected with the sedimentation tank, and the filtering aperture of the fine grid filtering mechanism is less than 4mm; a solid discharge port of the scum squeezing mechanism and a solid discharge port of the fine grid filtering mechanism are both communicated with the extrusion dewatering mechanism. The sand and impurity removal system provided by the specification can play the function of the slurry sedimentation tank to the greatest extent, and is matched with complete treatment equipment, so that slag and sand are removed and recycled to the greatest extent.

Description

TECHNICAL FIELD

[0001] The present specification relates to the technical field of sand removal, and particularly relates to a sand and impurity removal system. BACKGROUND

[0002] The sedimentation tank is a structure for removing suspended solids in water by sedimentation, and is a water purification device. The suspended solids in water are removed by natural sedimentation or coagulation sedimentation.

[0003] However, the treatment of slurry in the existing sedimentation tank is not perfect or is too simple, especially the treatment of organic slurry such as kitchen waste, which easily causes waste of organic matter and cannot effectively remove the sand in the slurry. CONTENT OF THE UTILITY MODEL

[0004] In view of the deficiencies of the prior art, one object of the present specification is to provide a sand and impurity removal system which can maximize the function of the slurry sedimentation tank, and complete the treatment equipment so that the sand is removed and recycled to the maximum extent.

[0005] To achieve the above object, the embodiment of the present specification provides a sand and impurity removal system, comprising:

[0006] A sedimentation tank, the bottom of the sedimentation tank is V-shaped;

[0007] A sand collecting pit arranged at one end of the sedimentation tank;

[0008] A horizontal screw sand discharging mechanism for conveying the sediment at the bottom of the sedimentation tank to the sand collecting pit; the horizontal screw sand discharging mechanism is arranged at the lowest position in the V-shaped sedimentation tank;

[0009] A sand removal mechanism connected with the sand collecting pit for cleaning and separating the sand-water mixture in the sand collecting pit; the liquid outlet of the sand removal mechanism is connected with the sedimentation tank;

[0010] A floating screw skimming mechanism installed at the water outlet end of the sedimentation tank;

[0011] A floating skimming pressing mechanism connected with the floating screw skimming mechanism for filtering and dewatering the floating skimming; the liquid outlet of the floating skimming pressing mechanism is connected with the sedimentation tank;

[0012] A fine mesh filter mechanism connected with the sedimentation tank, the filter aperture of the fine mesh filter mechanism is less than 4mm;

[0013] An extrusion dewatering mechanism, the solid outlet of the floating skimming pressing mechanism and the solid outlet of the fine mesh filter mechanism are both connected with the extrusion dewatering mechanism.

[0014] As a preferred implementation, the precipitation tank is connected with a steam pipe for conveying steam to the precipitation tank; the steam pipe is provided with a first electric valve for controlling the opening and closing of the steam pipe.

[0015] As a preferred implementation, the horizontal spiral sand discharging mechanism includes a horizontal sand discharging screw, and the diameter of the horizontal sand discharging screw is greater than or equal to 270 mm.

[0016] As a preferred implementation, the horizontal spiral sand discharging mechanism further includes a U-shaped groove body and a first driving member, the U-shaped groove body is made of 304 stainless steel, the outer shell of the U-shaped groove body is provided with a reinforcing rib, and a wear-resistant lining plate is arranged in the U-shaped groove body; the horizontal sand discharging screw includes a plurality of connected sub-screws, and adjacent sub-screws are fixed through a socket shaft; and the first driving member is a dry-type motor reducer provided with an overload protection part.

[0017] As a preferred implementation, the sand removal mechanism has a separation efficiency of greater than 95% for fine sand with a diameter of greater than or equal to 0.2 mm, and the content of sand organic matter is less than or equal to 3%; and the sand removal mechanism has a processing capacity of greater than or equal to 60 m 3 / h.

[0018] As a preferred implementation, the sand removal mechanism includes a cyclone feeder, a wall effect flow guide, a separation cavity, a sand washing stirrer, a fluidized scrubber, and a sand lifting device; the separation cavity adopts a rounded conical flat bottom structure, and is used for sand separation and sand washing; and the sand lifting device is inclined and provided with a sand discharging screw, the diameter of the sand discharging screw is less than or equal to 350 mm, and the bottom end bearing of the sand discharging screw adopts a ceramic bearing.

[0019] As a preferred implementation, the floating spiral skimming mechanism includes a conveying screw, a chain for driving the conveying screw to rotate, and a floating residue removal member coupled to the conveying screw.

[0020] As a preferred implementation, the floating residue squeezing mechanism includes a stainless steel box body and a screen mesh obliquely installed in the box body, the screen mesh is connected with a second driving member for driving the screen mesh to rotate upward; and the floating residue squeezing mechanism has a residue output solid content of greater than or equal to 30%.

[0021] As a preferred implementation, the fine mesh filter mechanism has a filter aperture of 2 mm to 4 mm, and is connected with a frequency conversion part for adjusting the operating speed of the fine mesh filter mechanism.

[0022] As a preferred implementation, the extrusion dewatering mechanism has a solid residue water content of less than or equal to 60% after extrusion, and has a processing capacity of 10 t / h to 15 t / h. Advantages

[0023] The sand and impurity removing system provided by the embodiment can remove heavy substances (such as shells, glass, porcelain chips, sand, etc.) in the slurry by setting the horizontal spiral sand removing mechanism and the sand removing mechanism, and can remove light floating substances (such as plastic pieces, chili seeds, and fine fibers) in the slurry by setting the floating spiral skimming mechanism, thereby preventing damage to the centrifuge, pump, pipeline and other equipment caused by the impurities and preventing the impurities from settling and accumulating in the tank of the anaerobic digestion system. The bottom of the sedimentation tank is V-shaped, which is beneficial to the sedimentation and collection of fine sand. In addition, the scum squeezing mechanism can filter and dewater the scum discharged by the floating spiral skimming mechanism, and the dewatered liquid is transported back to the sedimentation tank, thereby avoiding waste of organic matter. The fine grid filter mechanism has a filter aperture of less than 4 mm, which can further filter the slurry after removing the inorganic heavy substances and scum, and effectively remove the suspended impurities. The extrusion dewatering mechanism can extrude and dewater the solid discharged by the scum squeezing mechanism and the fine grid filter mechanism, so that the filter residue has a higher solid content and a lower oil content, thereby facilitating external transportation and disposal. The sand and impurity removing system can maximize the function of the slurry sedimentation tank, and is matched with complete treatment equipment, so that the sand and slag are maximally removed and recycled.

[0024] The specific embodiments of the present application are disclosed in detail in the following description and drawings, and the principles of the present application can be used in the manner indicated. It should be understood that the embodiments of the present application are not limited in scope in this regard.

[0025] Features described and / or illustrated with respect to one embodiment can be used in the same or similar manner in one or more other embodiments, in combination with or in place of features in the other embodiments.

[0026] It should be emphasized that the term "comprises / comprising" when used in this specification is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0028] Figure 1 It is a structural schematic diagram of a sand and impurity removing system provided in the embodiment.

[0029] Explanation of reference signs:

[0030] 1, sedimentation tank; 2, horizontal screw sand discharge mechanism; 21, first driving member; 3, sand pumping device; 4, sand removing mechanism; 41, separation cavity; 42, sand lifting device; 43, sand washing stirrer; 44, second electric valve; 5, floating screw skimming mechanism; 51, skimming pump; 6, dross pressing mechanism; 7, fine grid filter mechanism; 8, extrusion dehydration mechanism; 9, steam pipe; 10, first electric valve. DETAILED DESCRIPTION

[0031] In order to make the technical personnel in the technical field better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0032] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can be a middle element present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be a middle element present. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be limiting.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein only for the purpose of describing specific embodiments and is not intended to limit the present application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] Please refer to Figure 1 The embodiment of the present application provides a sand and impurity removing system, characterized by comprising: a sedimentation tank 1, a sand collecting pit (not shown in the figure), a horizontal screw sand discharge mechanism 2, a sand removing mechanism 4, a floating screw skimming mechanism 5, a dross pressing mechanism 6, a fine grid filter mechanism 7 and an extrusion dehydration mechanism 8.

[0035] The bottom of the sedimentation tank 1 is V-shaped. The sand collecting pit is arranged at one end of the sedimentation tank 1. The horizontal spiral sand discharging mechanism 2 is used for conveying the sediment at the bottom of the sedimentation tank 1 to the sand collecting pit. The horizontal spiral sand discharging mechanism 2 is arranged at the lowest position in the V-shaped sedimentation tank 1. The sand removing mechanism 4 is connected with the sand collecting pit and is used for cleaning and separating the sand-water mixture in the sand collecting pit. The liquid outlet of the sand removing mechanism 4 is connected with the sedimentation tank 1. The floating spiral skimming mechanism 5 is installed at the water outlet end of the sedimentation tank 1. The floating skimming mechanism 5 is connected with the floating spiral skimming mechanism 5 and is used for filtering and dewatering the floating skimming. The liquid outlet of the floating skimming mechanism 6 is connected with the sedimentation tank 1. The fine grid filter mechanism 7 is connected with the sedimentation tank 1. The filter aperture of the fine grid filter mechanism 7 is less than 4 mm. The solid outlet of the floating skimming mechanism 6 and the solid outlet of the fine grid filter mechanism 7 are connected with the extrusion dewatering mechanism 8.

[0036] The sand and impurity removing system provided by the embodiment can remove heavy substances (such as shells, glass, porcelain chips, sand, etc.) in the slurry by arranging the horizontal spiral sand discharging mechanism 2 and the sand removing mechanism 4, and can remove light and floating suspended substances (such as plastic pieces, chili seeds, and fine fibers) in the slurry by arranging the floating spiral skimming mechanism 5, thereby preventing damage to equipment such as centrifuges, pumps, and pipelines, and preventing the accumulation of impurities in the tank of the anaerobic digestion system. The bottom of the sedimentation tank 1 is V-shaped, which is beneficial to the sedimentation and collection of fine sand. In addition, the floating skimming mechanism 6 can filter and dewater the floating skimming discharged by the floating spiral skimming mechanism 5, and convey the dewatered liquid back to the sedimentation tank 1, thereby avoiding the waste of organic matter. The filter aperture of the fine grid filter mechanism 7 is less than 4 mm, which can further filter the slurry after removing inorganic heavy substances and floating skimming, and effectively remove suspended impurities. The extrusion dewatering mechanism 8 can extrude and dewater the solid discharged by the floating skimming mechanism 6 and the fine grid filter mechanism 7, so that the filter residue has a higher solid content and a lower oil content, thereby facilitating external transportation and disposal. The sand and impurity removing system can maximize the function of the slurry sedimentation tank 1, and is complete with the supporting treatment equipment, so that the sand and impurities are maximally removed and recovered.

[0037] As shown in Figure 1 The sedimentation tank 1 is connected with a steam pipe 9 for conveying steam to the sedimentation tank 1, which can heat the slurry to help the slurry separate more efficiently, and can also flush the sedimentation tank 1. The steam pipe 9 is provided with a first electric valve 10 for controlling the opening and closing of the steam pipe 9, so that steam can be supplied to the sedimentation tank 1 as needed.

[0038] In the embodiment, the fine solids such as inorganic sand particles deposited in the sedimentation tank 1 are transported and collected by the horizontal screw sand discharge mechanism 2 installed at the bottom of the sedimentation tank 1. The horizontal screw sand discharge mechanism 2 is started periodically to transport the sediment at the bottom of the sedimentation tank 1 to the sand collecting pit at one end of the sedimentation tank 1, and then the sand water mixture is discharged into the sand removal mechanism 4 by the sand lifting pump 3.

[0039] The horizontal screw sand discharge mechanism 2 includes a horizontal sand discharge screw rod installed in the sand collecting groove at the bottom of the sedimentation tank 1. The bottom sand is transported to the sand collecting pit along the rotation direction of the horizontal sand discharge screw rod according to the set working period. The sand water mixture in the sand collecting pit is lifted to the sand removal mechanism 4 by the sand lifting pump 3 for sand water separation. The horizontal sand discharge screw rod can meet the working conditions of long-term continuous or intermittent operation or long-term stop and then operation, and the rotation speed of the screw rod is adjustable. The diameter of the horizontal sand discharge screw rod is greater than or equal to 270 mm.

[0040] Specifically, the horizontal screw sand discharge mechanism 2 further includes a U-shaped groove body and a first driving member 21. The U-shaped groove body is made of 304 stainless steel, and the outer shell of the U-shaped groove body is provided with reinforcing ribs to ensure sufficient rigidity and prevent deformation. The U-shaped groove body is filled after the bottom groove is fixed. The U-shaped groove body is configured with a replaceable wear-resistant lining plate. The horizontal sand discharge screw rod includes a plurality of connected sub-screw rods, and adjacent sub-screw rods are fixed by a socket shaft. The sand conveying process is completed by a high-strength stainless steel shaft screw rod (horizontal sand discharge screw rod). The stainless steel shaft screw conveyor has sufficient rigidity, a single screw shaft length exceeds the standard length of 6 m, a separate design center positioner is provided to ensure the concentricity during the conveying process, and the connection is completed by a socket shaft fixed coupling. The first driving member 21 is a dry motor reducer provided with an overload protection part, and the protection level is IP65.

[0041] In the embodiment, the sand removal mechanism 4 is specially used for cleaning and separating the sand water mixture discharged from the sand collecting pit of the sedimentation tank 1, has the dual functions of sand water separation and sand surface contaminant cleaning, can realize full automatic operation function, the separation efficiency of fine sand with a diameter of 0.2 mm or more is greater than 95%, the organic matter content of the discharged sand is less than or equal to 3%, and the recovery rate of sand in wastewater is effectively improved. At the same time, the organic matter generated in the sand washing and separating process is returned to the sedimentation tank 1, preventing the loss of carbon source. The capacity of the sand removal mechanism 4 for treating sand water mixture is greater than or equal to 60 m3 / h.

[0042] Specifically, the sand removing mechanism 4 comprises a cyclone feeder, a wall effect flow guide, a separation cavity 41, a sand washing stirrer 43, a fluidized washer and a sand lifting device 42, and can also be provided with test instruments and an automatic control cabinet. The separation cavity 41 adopts a reverse conical flat bottom structure, and is used for sand separation and sand washing. The bottom of the separation cavity 41 can be connected with a second electric valve 44, which controls the opening and closing of the flushing pipeline, so that the outlet end of the separation cavity 41 can be flushed as needed. The sand removing mechanism 4 is not affected by the washing and sand discharging operation function when continuously feeding. The sand lifting device 42 is inclined and provided with a sand discharging screw rod. The diameter of the sand discharging screw rod is less than or equal to 350 mm, and the bottom end bearing of the sand discharging screw rod adopts a ceramic bearing, which is sand-proof and wear-resistant, and is free of oil lubrication maintenance for life, and the sand discharging screw rod does not need to be provided with a guide strip or a non-metallic shell pad in the groove. The sand discharging period and duration of the sand lifting device 42 can be adjusted.

[0043] In the embodiment, the floating spiral skimming mechanism 5 comprises a conveying screw rod, a chain for driving the conveying screw rod to rotate and a floating skimming device coupled with the conveying screw rod. The conveying screw rod can be driven to rotate by the high-strength engineering plastic chain. The floating skimming mechanism 5 can transport the floating sludge to the collection port through the rotation of the conveying screw rod. The conveying screw rod has a floating performance, and when the liquid level in the sedimentation tank 1 fluctuates up and down, the conveying screw rod also changes with the floating. The floating skimming mechanism 5 is coupled with the floating conveying screw rod to realize the discharge of the floating sludge, and is connected with a flexible pipeline and a submersible pump, so that the discharge flow of the floating sludge can be kept constant even in the case of liquid level fluctuation. In the case of liquid level fluctuation, the conveying screw rod and the floating skimming device coupled therewith must be able to automatically adjust the height up and down. In addition, as shown in the figure, the floating spiral skimming mechanism 5 can be connected with a skimming pump 51 for providing power. Figure 1

[0044] In the embodiment, the floating sludge squeezing mechanism 6 comprises a stainless steel box body and a screen mesh obliquely installed in the box body. The screen mesh is connected with a second driving member for driving the screen mesh to rotate upward. The discharge sludge of the floating sludge squeezing mechanism 6 has a solid content of greater than or equal to 30%.

[0045] Since the floating sludge collected by the floating spiral skimming mechanism 5 has a high water content, it is discharged into the floating sludge squeezing mechanism 6 for filtering and dewatering. The floating sludge squeezing mechanism 6 is a high-efficiency separation receiving mechanism with a fine grid as the core part. When the sewage passes through the obliquely placed screen mesh, floating, sedimentation and suspended substances are effectively intercepted and squeezed and separated. It is a "three-in-one" grid mechanism integrating the functions of filtering, conveying, lifting and squeezing, and can realize periodic sealed cleaning of the filter sludge, realize closed transfer of the filter sludge, greatly reduce the load of the later stage, and no odor overflow.

[0046] ​In the embodiment, the slurry is discharged from the sedimentation tank 1 after removing inorganic heavy substances and dregs, and then enters the fine grid filtering mechanism 7 to filter and remove suspended impurities in the slurry. The filtering aperture of the fine grid filtering mechanism 7 is preferably 2mm-4mm, and a grid bar type grid can be used. The grid can be free of washing water, thereby reducing the water consumption of the system and simplifying the process.

[0047] The fine grid filtering mechanism 7 can use a scraper rotary fine grid. All the tooth harrows and the transmission chains on both sides and the upper and lower rotating chain gears are all installed on the water-facing side of the grid bar and the grid back plate. The grid net through which the sewage flows is made of a stainless steel wedge-shaped grid net, and the sewage flow-through efficiency is very high. The trapped pollutants are collected in the channel bottom area, and then scraped and transported to the residue discharge area along the grid net by the rotary tooth harrow. A residue scraping plate is installed in the upper residue discharge area, and the grid residue can be cleaned and discharged by the residue scraping plate without the need for cleaning brushes and washing water. The fine grid filtering mechanism 7 is connected with a frequency conversion part for adjusting the running speed of the fine grid filtering mechanism 7. Under normal water quantity and normal grid residue conditions, the frequency conversion part controls the fine grid filtering mechanism 7 to run at a low speed; when the water quantity and the grid residue are large, the frequency conversion part controls the fine grid filtering mechanism 7 to run at a high speed, quickly cleaning the residue and keeping the water flow unobstructed, while maintaining a low water head loss.

[0048] In the embodiment, the grid residue discharged from the dregs pressing mechanism 6 and the fine grid filtering mechanism 7 is concentrated and dewatered by the extrusion dewatering mechanism 8, so that the filter residue has a higher solid content and a lower oil content, facilitating external transportation and disposal.

[0049] The extrusion dewatering mechanism 8 is designed in an integrated manner, the whole device is corrosion-resistant, and the flow-through material is SS304 stainless steel. The extrusion dewatering mechanism 8 uses a single-shaft screw extruder, which mainly consists of a rack, a fixed screen, a screw shaft, an inlet and outlet hopper, a cover, a third driving part and a hydraulic system. The screw shaft dewatering is realized by screw conveying and pressing, achieving the best extrusion effect. The discharge end pressure of the extrusion dewatering mechanism 8 is adjustable, and the water content of the solid residue after extrusion can be less than or equal to 60%. The extrusion dewatering mechanism 8 is continuous production, convenient to control, and has high efficiency. The processing capacity of the extrusion dewatering mechanism 8 is set to 10t / h-15t / h.

[0050] The sand and light removal system provided by the embodiment has a high sand and light removal rate, can effectively remove sand and stones in each particle size range, ensure less sand accumulation in the tank in the rear-end process section, and reduce equipment wear. The active sand removal process is used, and the sand removal effect can be controlled. The contact part of the sand and light removal system and the material is made of 304 stainless steel, which has strong corrosion resistance. The sand and light removal system has few power consumption devices and low operation power consumption.

[0051] It should be noted that, in the description of the present specification, the terms "first", "second", and the like are used only for the purpose of description and distinguishing similar objects, and there is no precedence or significance between them. In addition, in the description of the present specification, unless otherwise specified, the meaning of "plurality" is two or more.

[0052] Any numerical values recited herein include all values from the lower value and the upper value in increments of one unit, provided that there is a separation of at least two units between any lower value and any higher value. As an example, if a numerical value is recited as being from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, it is intended that values such as 15 to 85, 22 to 68, 43 to 51, 30 to 32, etc. are expressly enumerated in this specification. For values which are less than one, one unit is considered to be 0.0001, 0.001, 0.01, 0.1, etc. These are only examples of what is specifically enumerated herein, and all possible combinations of numerical values between the lowest value and the highest value enumerated, are to be considered to be expressly stated in this application.

[0053] Unless otherwise stated, all ranges include the endpoints and all numbers between the endpoints. "Approximately" or "about" when used with a range means that both the lower and upper endpoints are approximated. Thus, "about 20 to 30" is intended to cover "about 20 to about 30", including at least the endpoints.

[0054] All articles and references, including patents and publications, disclosed previously are incorporated herein by reference for all purposes. The term "consisting essentially of to describe combinations shall include the elements, ingredients, components or steps identified, and such other elements, ingredients, components or steps that do not materially affect the basic and novel characteristics of the combinations. The use of the term "comprising" or "including" to describe combinations herein is also intended to cover embodiments consisting essentially of the elements, ingredients, components or steps. The use of the term "may" herein is intended to mean that the described attribute is optional.

[0055] Plural elements, ingredients, components or steps can be provided by a single integrated element, ingredient, component or step. Alternatively, a single integrated element, ingredient, component or step might be divided into separate plural elements, ingredients, components or steps. To "comprise" or "comprising", "include" or "including" or "has" or "having" or "contain" or "containing" or "consist" or "consisting" or "consisting essentially of" as used herein, can vary between "open" and "closed" transitions, and should be interpreted as "open" transitions, unless otherwise stated.

[0056] It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided would be apparent upon reading the above description. The scope of the teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated by reference for the purpose of the present disclosure. Any incorporation by reference of any article, reference or document shall not be construed as an admission that such article, reference or document is prior art to the present disclosure. Any omission of an aspect of the subject matter disclosed herein from any claim does not preclude that aspect from being claimed through reliance on another claim thereof.

Claims

1. A sand and impurity removal system, characterized by, include: A sedimentation tank, wherein the bottom of the sedimentation tank is V-shaped; A sand collection pit is provided at one end of the sedimentation tank; A horizontal spiral sand discharge mechanism is used to transport the sediment at the bottom of the sedimentation tank to the sand collection pit; the horizontal spiral sand discharge mechanism is located at the lowest point in the V-shaped sedimentation tank; A sand removal mechanism connected to the sand collection pit is used to clean and separate the sand-water mixture in the sand collection pit; the discharge port of the sand removal mechanism is connected to the sedimentation tank. A floating spiral skimming mechanism installed at the effluent end of the sedimentation tank; The scum pressing mechanism connected to the floating spiral skimming mechanism is used to filter and dewater the scum; the discharge port of the scum pressing mechanism is connected to the sedimentation tank. A fine screen filter mechanism connected to the sedimentation tank, wherein the filter pore size of the fine screen filter mechanism is less than 4 mm; The extrusion dewatering mechanism is connected to both the solid discharge port of the scum pressing mechanism and the solid discharge port of the fine screen filtration mechanism.

2. The sand and tramp removal system of claim 1, wherein, The sedimentation tank is connected to a steam pipe for supplying steam to the sedimentation tank; the steam pipe is equipped with a first electric valve for controlling the opening and closing of the steam pipe.

3. The sand and tramp removal system of claim 1, wherein, The horizontal spiral sand discharge mechanism includes a horizontal sand discharge screw, the diameter of which is greater than or equal to 270 mm.

4. The sand and tramp removal system of claim 3, wherein, The horizontal spiral sand discharge mechanism also includes a U-shaped trough and a first driving component. The U-shaped trough is made of 304 stainless steel, and the outer shell of the U-shaped trough is provided with reinforcing ribs. The inner shell of the U-shaped trough is provided with a wear-resistant liner. The horizontal sand discharge screw includes multiple connected sub-screws, and adjacent sub-screws are fixed by a socket shaft. The first driving component is a dry motor reducer with an overload protection section.

5. The sand and tramp removal system of claim 1, wherein, The sand removal mechanism has a separation efficiency of greater than 95% for fine sand with a diameter of 0.2 mm or more, and the content of sand removal organic matter is less than or equal to 3%; the sand removal mechanism has a processing capacity of greater than or equal to 60 m 3 / h for sand-water mixed liquid.

6. The sand and tramp removal system of claim 5, wherein, The sand removal mechanism includes a cyclone feeder, a wall-attached effect guide, a separation chamber, a sand washing agitator, a fluidized bed scrubber, and a sand lifter. The separation chamber adopts an inverted conical flat-bottom structure and is used for sand separation and washing. The sand lifter is inclined and equipped with a sand discharge screw. The diameter of the sand discharge screw is less than or equal to 350 mm, and the bottom bearing of the sand discharge screw is a ceramic bearing.

7. The sand and tramp removal system of claim 1, wherein, The floating spiral skimming mechanism includes a transport screw, a chain for driving the transport screw to rotate, and a scum removal component coupled to the transport screw.

8. The sand and tramp removal system of claim 1, wherein, The scum pressing mechanism includes a stainless steel box and a screen installed at an incline inside the box. The screen is connected to a second driving component, which drives the screen to rotate upward. The solid content of the scum discharged from the scum pressing mechanism is greater than or equal to 30%.

9. The sand and tramp removal system of claim 1, wherein, The fine screen filter mechanism has a filter aperture of 2mm to 4mm, and the fine screen filter mechanism is connected to a frequency converter to adjust the operating speed of the fine screen filter mechanism.

10. The sand and tramp removal system of claim 1, wherein, The moisture content of the solid residue after extrusion dewatering by the extrusion dewatering mechanism is less than or equal to 60%, and the processing capacity of the extrusion dewatering mechanism is 10t / h to 15t / h.

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