Spiral extrusion solid-liquid separation device applied to biogas slurry

Abstract

The utility model provides a spiral extrusion solid-liquid separation device applied to biogas slurry. The spiral extrusion solid-liquid separation device comprises a rack, the screw extrusion device is arranged on the rack and comprises a hollow filter screen and an extrusion screw which is arranged in the filter screen and is provided with a central shaft, the filter screen is provided with a feeding bin and a discharging port, and the section size of the filter screen is gradually reduced in the advancing direction of the extrusion screw; and the motor device is arranged on the rack and is used for driving the central shaft to rotate. Compared with the prior art, the spiral extrusion solid-liquid separation device applied to the biogas slurry has the advantages that the section size of the filter screen is gradually reduced along the advancing direction of the extrusion spiral, so that the space of the material in the forward extrusion process is gradually reduced, the solid-liquid separation efficiency is improved, and the ideal water content of the biogas residue after separation is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of environmental protection, and more specifically, relates to a spiral extrusion solid-liquid separation device applied to biogas slurry. Background Art

[0002] Using biogas engineering to treat livestock and poultry manure is a process technology that achieves harmlessness, reduction and resource utilization of organic waste. Wet anaerobic fermentation is one of the mainstream processes of biogas engineering. The fermentation liquid produced by wet anaerobic fermentation contains about 5-10% solids. The biogas residue in the fermentation liquid generally needs to be pre-dehydrated before aerobic composting to save storage space and improve production efficiency.

[0003] As an important part of the post-processing and utilization of biogas slurry and biogas residue, the research on solid-liquid separation and the optimization of solid-liquid separator technology are of great practical significance. At present, the screw extrusion solid-liquid separator commonly used for solid-liquid separation in biogas projects has mature technology and is widely used in the livestock and poultry manure solid-liquid separation industry. However, the existing screw extrusion solid-liquid separators have the following main defects:

[0004] Due to the high viscosity of the biogas slurry material, the separation efficiency of the existing screw extruder is not ideal. The moisture content of the separated biogas residue is higher than 70%, and the solid content of the biogas liquid is higher than 5%, which makes it impossible to use it for subsequent biogas residue fertilizer making and biogas liquid return to the field.

[0005] Due to the unsatisfactory separation effect, the existing strip wedge-shaped screens filter high concentrations of coarse matter in the biogas slurry, resulting in frequent clogging of the screens, which requires frequent shutdowns for manual cleaning. At present, the existing screw extrusion dehydrator screen cleaning mostly adopts manual unloading and cleaning, which causes inconvenience and low efficiency in operation, not only increasing labor costs, but also reducing material processing efficiency.

[0006] In view of this, it is indeed necessary to provide a screw extrusion solid-liquid separation device for biogas slurry with ideal solid-liquid separation efficiency. Utility Model Content

[0007] The invention aims to overcome the shortcomings of the prior art and provide a spiral extrusion solid-liquid separation device for biogas slurry with ideal solid-liquid separation efficiency.

[0008] In order to achieve the above-mentioned invention object, the utility model provides a screw extrusion solid-liquid separation device applied to biogas slurry, which comprises:

[0009] frame;

[0010] A screw extrusion device is arranged on the frame, comprising a hollow filter screen and an extrusion screw installed in the filter screen and provided with a central axis, wherein the filter screen is provided with a feed bin and a discharge port, and the cross-sectional size of the filter screen gradually decreases along the advancing direction of the extrusion screw; and

[0011] The motor device is arranged on the frame and is used for driving the central shaft to rotate.

[0012] According to an embodiment of the screw extrusion solid-liquid separation device applied to biogas slurry of the utility model, the motor device comprises a motor and a driving device, and a reducer is provided between the central shaft and the motor device.

[0013] According to an embodiment of the spiral extrusion solid-liquid separation device applied to biogas slurry of the utility model, the filter screen is formed by integrally sintering stainless steel, and the filter screen is provided with a plurality of filter holes, and the aperture of the filter holes is 50-100 microns.

[0014] According to an embodiment of the screw extrusion solid-liquid separation device applied to biogas slurry of the utility model, the porosity of the filter screen is not less than 70%.

[0015] According to an embodiment of the screw extrusion solid-liquid separation device applied to biogas slurry of the utility model, the gap between the extrusion screw and the inner wall of the filter screen is 0.4-0.6 mm, preferably 0.5 mm.

[0016] According to an embodiment of the spiral extrusion solid-liquid separation device applied to biogas slurry of the utility model, the cross-sectional size of the filter screen gradually decreases from an end adjacent to the motor device to an end away from the motor device.

[0017] According to an embodiment of the spiral extrusion solid-liquid separation device applied to biogas slurry of the utility model, the filter screen is in the form of a cone, and the side surface of the cone is inclined downward from the end adjacent to the motor device to the end away from the motor device relative to the horizontal direction, and the inclination angle is 30-40 degrees.

[0018] According to an embodiment of the screw extrusion solid-liquid separation device applied to biogas slurry, the frame is provided with a backwashing support rod and a backwashing ring that can reciprocate along the backwashing support rod, and the bottom of the filter screen is provided with a backwashing liquid outlet.

[0019] According to an embodiment of the spiral extrusion solid-liquid separation device applied to biogas slurry of the utility model, an inspection port is provided at the bottom of one end of the filter screen away from the motor device.

[0020] According to an embodiment of the spiral extrusion solid-liquid separation device applied to biogas slurry of the utility model, the backwashing circle is provided with dense high-pressure flushing water columns and brushes, and the brushes are in close contact with the filter screen.

[0021] Compared with the prior art, the screw extrusion solid-liquid separation device applied to biogas slurry of the utility model has the following beneficial technical effects:

[0022] The cross-sectional size of the filter screen gradually decreases along the forward direction of the extrusion screw. The use of a continuously variable diameter screw on the central axis can ensure that the space occupied by the material gradually becomes smaller during the forward extrusion process, thereby making full use of the force between the materials to fully squeeze out the moisture, improving its solid-liquid separation efficiency, and ensuring that the ideal moisture content of the sludge is obtained after separation. The design has been proven to ensure that the moisture content of the sludge is stably below 70%.

[0023] A stainless steel sintered filter screen is used. The pore size of the stainless steel sintered filter screen is 50-100 microns, which can better intercept the coarse matter in the filtered biogas slurry and ensure that the solid content of the biogas slurry after separation is not higher than 5%.

[0024] A movable reciprocating backwashing circle is arranged outside the filter screen, and a brush and a high-pressure water outlet are provided on the circle. When the screen is seriously clogged, the backwashing can be started through the PLC system, and the clogged sludge can be flushed clean on the spot under the action of the brush and the high-pressure water column, thus avoiding manual disassembly and off-site cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The following is a detailed description of the screw extrusion solid-liquid separation device for biogas slurry and its technical effects in conjunction with the accompanying drawings and specific embodiments, wherein:

[0026] Figure 1 The utility model is a structural schematic diagram of a spiral extrusion solid-liquid separation device applied to biogas slurry.

[0027] Reference numerals:

[0028] 1-motor; 2-driving device; 3-reducer; 4-feeding bin; 5-extrusion screw; 6-filter screen; 7-discharge port; 8-backwashing support rod; 9-backwashing ring; 10-backwashing liquid outlet; 11-inspection port; 12-frame. DETAILED DESCRIPTION

[0029] In order to make the invention purpose, technical solution and technical effect of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining the utility model, not for limiting the utility model.

[0030] Please refer to Figure 1As shown, the utility model provides a spiral extrusion solid-liquid separation device applied to biogas slurry, which comprises:

[0031] Rack 12;

[0032] A screw extrusion device is arranged on a frame 12, comprising a hollow filter screen 6 and an extrusion screw 5 installed in the filter screen 6 and provided with a central axis (not marked), the filter screen 6 is provided with a feed bin 4 and a discharge port 7, and the cross-sectional size of the filter screen 6 gradually decreases along the advancing direction of the extrusion screw 5; and

[0033] The motor device is arranged on the frame 12 and is used for driving the central shaft to rotate.

[0034] According to an embodiment of the screw extrusion solid-liquid separation device applied to biogas slurry of the utility model, the motor device includes a motor 1 and a driving device 2, and a reducer 3 is arranged between the central axis and the motor device. Unseparated biogas slurry enters the screw extrusion device from the feed bin 4. Under the joint action of the motor 1 and the driving device 2, the reducer 3 sets the extrusion speed according to the viscosity and scale of the material. The material is driven by the driving force and is transported forward along the extrusion screw 5. As the extrusion space gradually becomes smaller, the liquid after the material is extruded is filtered out through the filter screen 6, and the extruded biogas residue is collected through the discharge port 7.

[0035] According to an embodiment of the spiral extrusion solid-liquid separation device applied to biogas slurry of the utility model, the filter screen 6 is made of stainless steel sintered in one piece, and the filter screen 6 is provided with a plurality of filter holes, the aperture of the filter holes is 50-100 microns, and the porosity of the filter screen 6 is not less than 70%. The filter screen 6 is a horizontally placed hollow cone, and the side of the cone is inclined downward from the end adjacent to the motor device to the end away from the motor device relative to the horizontal direction, and the inclination angle is 30-40 degrees. Therefore, the cross-sectional size of the filter screen 6 gradually decreases from the end adjacent to the motor device to the end away from the motor device. The gap between the extrusion spiral 5 and the inner wall of the filter screen 6 is 0.4-0.6mm, preferably 0.5mm.

[0036] For biogas slurry with high viscosity, the problem of sieve hole clogging is more prominent. In order to alleviate the clogging of the filter screen 6 and reduce the frequency of manual cleaning, the screw extrusion solid-liquid separation device applied to biogas slurry of the utility model is provided with a timed backwashing device, which includes a backwashing support rod 8 arranged on a frame 12 and a backwashing ring 9 that can reciprocate along the backwashing support rod 8, a backwashing liquid outlet 10 is arranged at the bottom of the filter screen 6, and an inspection port 11 is arranged at the bottom of the end of the filter screen 6 away from the motor device.

[0037] The backwashing circle 9 is provided with dense high-pressure flushing water columns and brushes, and the brushes are in close contact with the filter screen 6. When the filter screen 6 is seriously clogged and needs to be cleaned, the backwashing program is turned on by the control system. At this time, the feed bin 4 and the motor drive 1 are suspended, and the backwashing circle 9 is turned on along the support rod 8 for repeated flushing. The backwashing circle 9 is provided with dense high-pressure fine water columns and brushes, which directly contact the filter screen 6 and flush it. In order to ensure that the filter screen 6 is transparent, the water column is followed by a brush, and the sludge adhered to the surface of the filter screen 6 is further removed by physical brushing. Under the joint action of the two, the filter screen 6 can be restored to the designed flux after the backwashing circle 9 goes back and forth several times, and the cleaning liquid after brushing is collected and discharged from the backwashing outlet 10. In addition, the device is provided with an inspection port 11, through which difficult-to-wash residues can be manually cleaned.

[0038] The following combination Figure 1 As shown, the working principle of the screw extrusion solid-liquid separation device of the utility model applied to biogas slurry is described in detail:

[0039] First, after the control system is started, the motor 1, the driving device 2 and the reducer 3 are turned on, and the extrusion screw 5 is rotated and pushed forward by the driving force, and the biogas slurry from the fermentation tank enters from the feed bin 4, wherein the feed bin 4 is provided with a distribution system, which evenly stirs the biogas slurry and enters the filter screen 6 with the action of gravity;

[0040] The biogas slurry is transported forward in the filter screen 6 by the thrust of the extrusion screw 5. The inclination angle of the filter screen 6 is 30-40 degrees to ensure that the space of the material gradually becomes smaller during the forward extrusion process, so as to improve its solid-liquid separation efficiency and ensure that the moisture content of the biogas residue after separation is less than 70%.

[0041] Under the action of the gradually increasing extrusion pressure, the separated liquid falls on the filter screen 6 with gravity. The filter screen 6 is made of stainless steel sintered in one piece, with filter holes with a pore size of 50-100 microns and a porosity of more than 70%. Larger volumes of impurities are intercepted by the screen gaps, ensuring higher filtration accuracy and reducing the proportion of suspended matter in the filtrate to less than 5%, thereby ensuring processing flux and processing efficiency.

[0042] Compared with the prior art, the screw extrusion solid-liquid separation device applied to biogas slurry of the utility model has the following beneficial technical effects:

[0043] The cross-sectional size of the filter screen 6 gradually decreases along the forward direction of the extrusion screw. The use of a continuously variable diameter screw on the central axis can ensure that the space of the material gradually becomes smaller during the forward extrusion process, thereby making full use of the force between the materials to fully squeeze out the moisture, improving its solid-liquid separation efficiency, and ensuring that the ideal moisture content of the sludge is obtained after separation. The design has been proven to ensure that the moisture content of the sludge is stably below 70%.

[0044] A stainless steel sintered filter screen 6 is used, and the aperture of the stainless steel sintered filter screen 6 is 50-100 microns, which can better intercept the coarse matter in the biogas slurry after filtering and ensure that the solid content of the biogas slurry after separation is not higher than 5%.

[0045] A movable reciprocating backwashing circle 9 is arranged outside the filter screen, and a brush and a high-pressure water outlet are arranged on the backwashing circle 9. When the screen is seriously clogged, the backwashing can be started through the PLC system, and the clogged sludge can be washed away on the spot under the action of the brush and the high-pressure water column, thereby avoiding manual disassembly and off-site cleaning.

[0046] According to the above principles, the present invention can also make appropriate changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A screw extrusion solid-liquid separation device for biogas slurry, characterized in that: include: frame; A screw extrusion device is arranged on the frame, comprising a hollow filter screen and an extrusion screw installed in the filter screen and provided with a central axis, wherein the filter screen is provided with a feed bin and a discharge port, and the cross-sectional size of the filter screen gradually decreases along the advancing direction of the extrusion screw; and A motor device, arranged on the frame, for driving the central shaft to rotate; Wherein, the frame is provided with a backwashing support rod and a backwashing ring which can reciprocate along the backwashing support rod, and the bottom of the filter screen is provided with a backwashing liquid outlet.

2. The screw extrusion solid-liquid separation device for biogas slurry according to claim 1 is characterized in that: The motor device comprises a motor and a driving device, and a reducer is arranged between the central shaft and the motor device.

3. The screw extrusion solid-liquid separation device for biogas slurry according to claim 1, characterized in that: The filter screen is formed by integrally sintering stainless steel, and the filter screen is provided with a plurality of filter holes, and the aperture of the filter holes is 50-100 microns.

4. The screw extrusion solid-liquid separation device for biogas slurry according to claim 3 is characterized in that: The porosity of the filter screen is not less than 70%.

5. The screw extrusion solid-liquid separation device for biogas slurry according to claim 1, characterized in that: The gap between the extrusion spiral and the inner wall of the filter screen is 0.4-0.6 mm.

6. The screw extrusion solid-liquid separation device for biogas slurry according to claim 1, characterized in that: The cross-sectional size of the filter screen gradually decreases from an end adjacent to the motor device to an end away from the motor device.

7. The screw extrusion solid-liquid separation device for biogas slurry according to any one of claims 1 to 6, characterized in that: The filter screen is in the form of a frustum, and the side surface of the frustum is inclined downward from an end adjacent to the motor device to an end away from the motor device relative to the horizontal direction, with an inclination angle of 30-40 degrees.

8. The screw extrusion solid-liquid separation device for biogas slurry according to claim 1, characterized in that: An inspection port is provided at the bottom of one end of the filter screen away from the motor device.

9. The screw extrusion solid-liquid separation device for biogas slurry according to claim 1, characterized in that: The backwashing circle is provided with dense high-pressure flushing water columns and brushes, and the brushes are in close contact with the filter screen.

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