Shield pressure-maintaining sewage sludge water-gas centrifugal separation system and method

Abstract

The present application provides a shield pressure maintaining sewage slurry gas centrifugal separation system and method, and relates to the technical field of sewage treatment, which comprises a sandstone separation device, a mud-water separation device and a turbid gas recovery device.The sandstone separation device comprises a sandstone separation main body, a feed pipe connected to the bottom of the sandstone separation main body, and a discharge pipe connected to the top of the sandstone separation main body, wherein a spiral separator is arranged between the feed pipe and the discharge pipe.The mud-water separation device comprises a mud-water separation main body, a feed joint, a liquid outlet assembly and a mud outlet assembly, wherein the liquid outlet assembly and the mud outlet assembly are in a relatively sealed state.The turbid gas recovery device is connected to the top of the mud-water separation main body.The present application does not need a vibrating screen, and simplifies the related separation equipment, and also realizes self-production and self-sale of turbid gas, without the need for a separate gas purification device, which improves the processing efficiency, simplifies the related equipment, further reduces the space occupied by the shield device, and ensures the long-term normal operation of the automatic pressure maintaining system of the shield device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, in particular to a shield pressure-maintaining sewage slurry-gas centrifugal separation system and method. BACKGROUND

[0002] The mechanical excavation of the tunnel mainly has two shield technologies of earth pressure balance and slurry balance, in construction, the pressure of the tunneling operation face is automatically adjusted and controlled by using air control technology, so that it is always in a balanced state, the excavation face is stable in the shield tunneling, so as to ensure the safety and efficiency of the shield construction; the automatic pressure-maintaining system of the shield equipment is a single-parameter constant-value closed-loop automatic control system taking the soil bin or slurry bin as the controlled object and the pressure in the bin as the controlled parameter.

[0003] In the automatic pressure-maintaining system of the shield equipment, lubricating liquid needs to be continuously pumped towards the working face to maintain the pressure of the tunneling operation face, so as to realize efficient tunneling of the working face, and a large amount of wastewater containing sand and slurry is generated in the process of the shield.

[0004] By separating the wastewater, the sand and the dried sludge are discharged, and the purified wastewater is discharged into the working face, which can realize resource saving, reduce the water consumption of the shield equipment, and also reduce the burden of the related conveying equipment; the traditional equipment realizes the separation of sand and slurry and the conveying of dried sludge by combining a vibrating screen, a vortex separator and a spiral conveying blade.

[0005] However, the traditional separation equipment is large in size, not only occupies the volume inside the shield equipment, but also affects the placement of other equipment, and at the same time, the relatively open separation equipment also produces a large amount of turbid gas in the separation process, the humidity of the turbid gas is large and contains part of particulate matter, which affects the surrounding working environment and affects the long-term normal operation of the automatic pressure-maintaining system of the shield equipment. SUMMARY

[0006] In view of the above problems, the present application provides a shield pressure-maintaining sewage slurry-gas centrifugal separation system and method, which improves the separation efficiency, eliminates the need for a vibrating screen, simplifies the related separation equipment, and also realizes self-production and self-sale of turbid gas without the need for a separate gas purification device, which not only improves the processing efficiency, but also simplifies the related equipment, further reduces the space occupied by the shield equipment, and ensures the long-term normal operation of the automatic pressure-maintaining system of the shield equipment.

[0007] To solve the above problems, the technical scheme adopted by the present application is:

[0008] The shield pressure maintaining sewage sludge gas centrifugal separation system comprises a sand and stone separation device, a sludge and water separation device, and a turbid gas recovery device.

[0009] The sludge and water gas is treated separately by the device, the relatively pure sewage is pumped into the side of the tunneling construction surface through the pressure maintaining system, the pressure balance of the tunneling surface is maintained, the pressure balance in the sludge tank is ensured, and the normal tunneling of the shield device is ensured; the sludge can be fully dried and transported to the outside of the shield device; the turbid gas can be introduced into the sewage for mixing, the waste gas is self-produced and self-sold, no turbid gas treatment device is needed, the related structure is simplified, the turbid gas treatment efficiency is improved, and the long-term normal operation of the automatic pressure maintaining system of the shield device is ensured.

[0010] Preferably, the sand and stone separation body is provided with two parallel sand and stone separation bodies, the feed pipe and the discharge pipe are both three-way pipes, and a first electromagnetic valve is arranged in the three-way pipe, and the two first electromagnetic valves are electrically connected.

[0011] Preferably, the turbid gas recovery device comprises a recovery main pipe and two recovery branch pipes, the first ends of the two recovery branch pipes are communicated with the recovery main pipe through a three-way joint, a second electromagnetic valve is arranged in the three-way joint, the second electromagnetic valve is electrically connected with the first electromagnetic valve, and the second ends of the recovery branch pipes are communicated with the interiors of the corresponding sand and stone separation bodies.

[0012] Preferably, a flow guide pipe is vertically arranged at the central position in the interior of the sand and stone separation body, the flow guide pipe penetrates the spiral separator, a flow guide opening is formed in the side wall of the flow guide pipe, and the flow guide opening is located close to the spiral bottom of the spiral separator.

[0013] Preferably, a plurality of air permeation openings are formed in the upper end surface of the spiral separator, and the turbid gas recovery device is communicated with the plurality of air permeation openings.

[0014] Preferably, the plurality of air permeation openings are divided into a plurality of air permeation groups according to the distribution positions, the plurality of air permeation openings in the same air permeation group are located on the same spiral line, a control valve is arranged in each of the plurality of air permeation groups, and the plurality of control valves are alternately adjusted to be in a conducting state.

[0015] Preferably, the sludge-water separation main body comprises a relatively fixed separation shell, a separation cylinder is rotationally connected in the separation shell, a spiral conveying auger is arranged in the separation cylinder and rotates in a direction, the spiral conveying auger is attached to the inner wall of the separation cylinder at the edge, a plurality of water-permeable holes are formed in the separation cylinder opposite to the liquid outlet assembly, and a plurality of sludge outlet openings are formed in the separation cylinder opposite to the sludge outlet assembly.

[0016] Preferably, the sludge outlet assembly comprises a sludge outlet shell, the sludge outlet shell is communicated with the lower end of the sludge-water separation main body through a sludge guide cylinder, a spiral blade is rotationally connected in the sludge outlet shell, and the sludge outlet shell is arranged across the sludge guide cylinder.

[0017] Preferably, the liquid outlet assembly comprises a funnel-shaped collecting bucket, a U-shaped liquid discharge pipeline is communicated with the lower end of the collecting bucket, and the opening of the liquid discharge pipeline faces upward.

[0018] The shield pressure-maintaining sludge-water gas centrifugal separation method uses the shield sludge-water gas centrifugal separation system, and comprises the following steps: S1, pumping shield sludge containing sand and mud into the sand separation device to separate the sand, and pumping the separated mud into the sludge-water separation device; S2, performing sludge-water separation on the mud in the sludge-water separation main body of the sludge-water separation device to obtain relatively dry sludge and relatively pure sludge water; and S3, pumping the turbid gas in the sludge-water separation main body into the sand separation main body by the turbid gas recovery device.

[0019] The relatively pure sludge water obtained in step S2 is re-pumped to the side of the tunneling construction surface through the pressure-maintaining system, so that the pressure balance of the tunneling surface can be maintained, the pressure balance in the sludge chamber can be ensured, and the normal tunneling of the shield equipment can be ensured.

[0020] The shield pressure-maintaining sludge-water gas centrifugal separation method has the following beneficial effects:

[0021] Compared with the prior art, through the above structural design, the sand separation device is arranged, the mud containing sand can be preliminarily separated under the action of centrifugal force and gravity, the liquid inlet mode at the bottom of the feeding pipeline reduces the wear of the inner wall and improves the separation efficiency, the vibration screen is not needed, and the related separation equipment is simplified; the sludge-water separation device is designed as a whole and is closed, the turbid gas generated in the sludge-water separation device can be pumped in one direction through the turbid gas recovery device, the sand separation device at the front side is combined, compared with the traditional vibration screen, the turbid gas is prevented from overflowing to the greatest extent, the internal working environment is improved, the long-term normal operation of the automatic pressure-maintaining system of the shield equipment is ensured, the self-production and self-sale of the turbid gas are realized, the gas purification equipment does not need to be arranged separately, the processing efficiency is improved, the related equipment is simplified, and the space occupied in the shield equipment is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a perspective view of the present application.

[0023] Figure 2 is a perspective view of the present application. Figure 1

[0024] Figure 3 is a perspective view of the present application. Figure 1

[0025] Figure 4 is a perspective view of the present application. Figure 1

[0026] Figure 5 is a perspective view of the present application.

[0027] Figure 6 is a perspective view of the present application. Figure 5

[0028] Figure 7 is a perspective view of the present application. Figure 6

[0029] Figure 8 is a perspective view of the present application. Figure 7

[0030] Figure 9 is a perspective view of the present application.

[0031] Figure 10 is a perspective view of the present application.

[0032] In the figure: 100, sandstone separation device; 110, feeding pipeline; 120, sandstone separation main body; 121, liquid inlet opening; 122, spiral separator; 1221, air permeable opening; 123, flow guide pipeline; 1231, flow guide opening; 124, conical shell; 130, discharging pipeline; 200, turbid gas recovery device; 210, recovery branch pipeline; 220, recovery main pipeline; 300, slurry separation device; 310, feeding joint; 320, slurry separation main body; 321, separation shell; 322, separation cylinder; 3221, water permeable hole; 3222, lower sludge outlet; 323, spiral conveying auger; 330, sludge discharging assembly; 331, sludge guide cylinder; 332, spiral blade; 333, sludge discharging shell; 340, liquid discharging assembly; 341, liquid discharging pipeline. DETAILED DESCRIPTION

[0033] The present application is further illustrated below in conjunction with the accompanying drawings and examples.

[0034] Referring to the accompanying Figure 1 - the accompanying Figure 10 ​​​​​​, shield pressure maintaining sewage slurry gas centrifugal separation system, including sand separation device 100, turbidity recovery device 200, slurry separation device 300, the slurry containing sand first enters the sand separation device 100 and is centrifugally separated, can centrifugally separate the sand with larger particles, the separated slurry is transported to the slurry separation device 300, and the slurry and liquid are separated by centrifugal separation, to obtain the sludge with lower water content and the purified sewage, the sludge is discharged and transported outside the shield equipment, and the purified sewage is pumped into the working face by the shield equipment automatic pressure maintaining system to perform shield operation; a large amount of contaminated turbidity gas is generated in the centrifugal separation process in the slurry separation device 300, and the turbidity gas in the slurry separation device 300 can be pumped into the sand separation device 100 and mixed with the sewage by the turbidity recovery device 200, to realize automatic treatment of the turbidity gas and avoid the influence of the turbidity gas in the environment on the shield equipment automatic pressure maintaining system.

[0035] The sand separation device 100 includes a sand separation main body 120, the bottom of the sand separation main body 120 is communicated with a feeding pipe 110, the top is communicated with a discharging pipe 130, and a spiral separator 122 is arranged between the feeding pipe 110 and the discharging pipe 130; the feeding pipe 110 at the bottom can pump the slurry containing sand into the spiral separator 122, the slurry containing sand can move along the surface of the spiral separator 122 and rotate in the sand separation main body 120 during the movement, under the action of centrifugal force, the sand with large size and mass is centrifugally separated to the outside position and gradually slows down and finally stops, the particles with large size and the slurry are discharged through the top discharging pipe 130 and finally enter the slurry separation device 300 for subsequent slurry separation.

[0036] And the feeding pipe 110 is arranged at the bottom position, which can slow down the rising of the sand under the double actions of centrifugal force and gravity and shorten the sand settling time.

[0037] The slurry separation device 300 includes a slurry separation main body 320, a feeding connector 310, a liquid discharging assembly 340 and a sludge discharging assembly 330, and the liquid discharging assembly 340 and the sludge discharging assembly 330 are in a relatively sealed state; the feeding connector 310 is communicated with the discharging pipe 130, the slurry enters the slurry separation main body 320 through the feeding connector 310 and can be spun dry by centrifugal separation, to obtain the spun sludge and the relatively purified sewage, realizing real-time separation; the liquid discharging assembly 340 and the sludge discharging assembly 330 are in a relatively sealed state, which can avoid the turbid gas from being discharged from the two positions and avoid the turbid gas overflowing to affect the surrounding working environment, ensuring the long-term normal operation of the shield equipment automatic pressure maintaining system.

[0038] The first end of the turbid gas recovery device 200 is communicated with the top of the sludge separation main body 320, and the second end is communicated with the inside of the sandstone separation main body 120; turbid gas at the top of the sludge separation main body 320 is pumped into the sandstone separation main body 120 by the turbid gas recovery device 200; the turbid gas can be mixed with the liquid in the sandstone separation main body 120, and the particulate matter in the turbid gas is absorbed by the liquid, realizing automatic treatment of the turbid gas and avoiding the influence of turbid gas overflow on the automatic pressure maintaining system of the shield equipment.

[0039] In summary, through the above structural design, by setting the sandstone separation device 100, the slurry containing sand and stone can be preliminarily separated under the action of centrifugal force and gravity, the bottom liquid inlet of the feeding pipe 110 reduces the wear of the inner wall and improves the separation efficiency, and the related separation equipment is simplified; the sludge separation device 300 is designed as a whole and closed, and the turbid gas generated in the sludge separation device 300 can be pumped by the turbid gas recovery device 200, combined with the front sandstone separation device 100, compared with the traditional vibrating screen, the turbid gas overflow is avoided to the greatest extent, the internal working environment is improved, and the self-production and self-sale of turbid gas are realized, without the need for separately setting a gas purification device, which improves the processing efficiency and simplifies the related equipment, reduces the space occupied in the shield equipment.

[0040] Further, the sandstone separation main body 120 is arranged in parallel, the feeding pipe 110 and the discharging pipe 130 are both three-way pipes, and the first electromagnetic valve is arranged in the three-way pipe; the two first electromagnetic valves are electrically connected, the above-mentioned first electromagnetic valve is selected as a three-way valve, which can automatically control the flow direction of sewage; the state of the two first electromagnetic valves is synchronously controlled, and the slurry containing sand and stone can be controlled to flow directionally for separation.

[0041] While the first sandstone separation main body 120 is in a sandstone separation state, the second sandstone separation main body 120 is opened to be in a sandstone cleaning state, and the sandstone separation main body 120 is provided with a sealing gate plate at the bottom, which can quickly discharge the centrifugally separated sandstone; the continuous treatment of sewage is realized, and the efficiency of sewage treatment is further improved.

[0042] Specifically, the turbid gas recovery device 200 comprises a recovery main pipe 220 and two recovery branch pipes 210; the first end of the two recovery branch pipes 210 is communicated with the recovery main pipe 220 through a three-way joint, and the second electromagnetic valve is arranged in the three-way joint; the second electromagnetic valve is electrically connected with the first electromagnetic valve, and the second end of the recovery branch pipe 210 is communicated with the inside of the corresponding sandstone separation main body 120.

[0043] Through the above structural design, the turbid gas can be automatically pumped into the working sandstone separation main body 120, realizing automatic pumping control and further improving the turbid gas treatment effect.

[0044] Specifically, a flow guide pipe 123 is vertically arranged at a central position inside the sand separation body 120, the flow guide pipe 123 penetrates the spiral separator 122, the spiral separator 122 extends upward in a spiral shape, the spiral separator 122 is provided with an opening for the flow guide pipe 123 to pass through, and the side wall of the flow guide pipe 123 is provided with a flow guide opening 1231 located close to the spiral bottom of the spiral separator 122.

[0045] During the pumping of the sand-containing slurry, the sand-containing slurry can continuously rise along the spiral separator 122, and the rising slurry can be affected by the centrifugal force and the gravity to settle close to the edge of the bottom; small-size particulate matter and the slurry can enter the discharge pipe 130 from the flow guide opening 1231 under the action of the liquid flow, and finally enter the slurry separation device 300 for slurry separation.

[0046] The flow guide opening 1231 located close to the spiral bottom of the spiral separator 122 can maximize the distance from the edge of the sand, thereby avoiding the sand from entering the flow guide opening 1231 and affecting the normal separation of the sand.

[0047] A plurality of air permeation openings 1221 are opened on the upper end surface of the spiral separator 122, the turbid gas recovery device 200 communicates with the plurality of air permeation openings 1221, the turbid gas in the turbid gas recovery device 200 can finally be discharged from the air permeation openings 1221, and the discharged gas can be directly mixed with the sewage, so that the particulate matter in the turbid gas can be absorbed by the sewage. The sewage rising in the spiral separator 122 can further prolong the contact time with the turbid gas, thereby improving the absorption effect of the turbid gas. The turbid gas that is not completely absorbed can be subsequently stored in the conical shell 124 and gradually mixed with the sewage at the top of the liquid surface. The bottom of the sand separation body 120 is in a liquid-sealed state, and the leakage of the turbid gas is also avoided.

[0048] Meanwhile, the turbid gas discharged from the air permeation openings 1221 can exert a force on the sand and the slurry at the upper end of the spiral separator 122, thereby further improving the separation effect of the sand and the slurry. The sand raised by the gas can be separated and rotated to the edge position under the action of the liquid flow centrifugal force. Meanwhile, the slurry at the bottom of the sand can be accelerated to separate from the sand under the action of the gas, thereby improving the separation and recovery effect of the slurry.

[0049] Preferably, the plurality of air permeation openings 1221 are divided into a plurality of air permeation assemblies according to the distribution positions, the plurality of air permeation openings 1221 of the same air permeation assembly are located on the same spiral line, and the plurality of air permeation assemblies are each provided with a control valve.

[0050] Through the structural design, the number of gas exhaust openings 1221 of the single exhaust gas can be reduced, the flow of the exhaust gas of the gas exhaust openings 1221 can be increased, and the treatment effect on the sand and stones can be improved. Meanwhile, the multiple gas exhaust assemblies exhaust the gas in sequence, which can alternately achieve deep cleaning of the surface of the spiral separator 122, and the separation of the sand and stones is achieved to the greatest extent.

[0051] Preferably, the multiple gas exhaust assemblies exhaust the gas from the inside to the edge position step by step. In this process, the sand and stones located at the inside can continuously be affected by the airflow and move towards the inside. The airflow can lift the sand and stones in all stages until the sand and stones move to the edge position, and the separation effect of the sand and stones and the mud is further improved.

[0052] Specifically, the sludge separation body 320 includes a relatively fixed separation shell 321, the separation shell 321 is rotationally connected with a separation cylinder 322, the separation cylinder 322 is horizontally arranged, and in the process of directional rotation of the separation cylinder 322, the separation cylinder 322 can achieve spin-drying of the sludge. The separation cylinder 322 is internally provided with a directional rotation spiral conveying auger 323, the separation cylinder 322 and the spiral conveying auger 323 are controlled to rotate through a separate driving structure. The spiral conveying auger 323 is in abutment with the inner wall of the separation cylinder 322 at the edge, and in the process of rotation of the spiral conveying auger 323, the spiral conveying auger 323 can clean the inner wall of the separation cylinder 322, realize scraping of the sludge, and drive directional movement of the scraped sludge. The separation cylinder 322 is provided with multiple water permeable holes 3221 opposite to the liquid outlet assembly 340, and the separation cylinder 322 is provided with multiple sludge outlet ports 3222 opposite to the sludge outlet assembly 330.

[0053] It should be noted that in the process of sludge separation, the liquid level in the liquid outlet assembly 340 needs to be controlled to be below the separation cylinder 322, so as to avoid failure to achieve the effect of sludge separation. In the process of continuous rotation of the separation cylinder 322, the liquid is continuously discharged from the water permeable holes 3221, and the dewatered sludge can move directionally along the inner wall of the separation cylinder 322 and finally be discharged from the sludge outlet ports 3222.

[0054] Specifically, the sludge outlet assembly 330 includes a sludge outlet shell 333, the sludge outlet shell 333 is communicated with the lower end of the sludge separation body 320 through a sludge guide cylinder 331, the sludge outlet shell 333 is rotationally connected with a spiral blade 332 inside, and the sludge outlet shell 333 and the sludge guide cylinder 331 are cross arranged. Through the cross arrangement of the sludge outlet shell 333 and the sludge guide cylinder 331, a sludge sealing effect can be formed therebetween. By controlling the rotation rate of the spiral blade 332, part of the sludge remaining in the sludge guide cylinder 331 can be used as a sealing medium to avoid leakage of turbid gas from the sludge guide cylinder 331.

[0055] The liquid outlet assembly 340 comprises a funnel-shaped collecting bucket, and a U-shaped liquid discharge pipeline 341 is communicated with the lower end of the collecting bucket, and the opening of the liquid discharge pipeline 341 faces upward, so that a curved sealing channel can be formed at the bottom, and a liquid sealing effect can be formed at the bottom of the liquid discharge pipeline 341, so as to avoid leakage of turbid gas. The inside of the liquid discharge pipeline 341 is the purified sewage, and the content of sand and slurry is greatly reduced. The shield equipment automatic pressure maintaining system discharges the sewage to one side of the shield equipment tunneling construction surface at a predetermined rate, maintains the pressure balance inside the shield equipment tunneling construction surface, and ensures the continuous and normal tunneling operation.

[0056] The application is further described below in combination with the mud gas centrifugal separation method.

[0057] The shield pressure maintaining sewage mud gas centrifugal separation method uses the shield mud gas centrifugal separation system, and comprises the following steps.

[0058] S1, the shield sewage containing sand and slurry is pumped into the sand separation device 100 for sand separation, and the obtained slurry is pumped into the mud separation device 300; a separate pump body can be arranged in the feed joint 310 to pump the slurry into the mud separation main body 320 of the mud separation device 300 for mud separation.

[0059] S2, the slurry in step S1 is subjected to mud separation in the mud separation main body 320 of the mud separation device 300, the sand separation main body 120 is provided with a liquid inlet opening 121 at the bottom, and the liquid inlet opening 121 is located at a tangential upward position, so that relatively dry sludge and relatively pure sewage are obtained, the relatively pure sewage is pumped back into the tunnel face for shield construction, and resource saving is realized; a large amount of turbid gas is generated in the process of mud rotation separation, and the turbid gas has high humidity and contains fine particulate matter.

[0060] S3, the turbid gas in the mud separation main body 320 is pumped into the sand separation main body 120 by the turbid gas recovery device 200 for absorption, so that the turbid gas is self-produced and self-sold, and a gas purification device does not need to be separately arranged, which improves the treatment efficiency, simplifies the related equipment, and reduces the space occupied in the shield equipment.

[0061] The mud gas is treated separately through the method; the relatively pure sewage obtained is pumped into the side of the tunneling construction surface through the pressure maintaining system, the pressure balance of the tunneling surface can be maintained, the pressure balance in the slurry chamber is ensured, and the normal tunneling of the shield equipment is ensured; the sludge obtained can be fully spun dry and dried and finally transported to the outside of the shield equipment; the turbid gas generated can be introduced into the sewage for mixing, the self-production and self-sale of the waste gas are realized, the turbid gas treatment equipment does not need to be increased, the related structure is simplified, the turbid gas treatment efficiency is improved, and the long time normal operation of the automatic pressure maintaining system of the shield equipment is ensured

[0062] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A shield pressure-maintained sewage sludge water-gas centrifugal separation system, characterized by, The application relates to a sandstone separation device (100) which comprises a sandstone separation main body (120), a feeding pipe (110) communicated with the bottom of the sandstone separation main body (120), a discharging pipe (130) communicated with the top of the sandstone separation main body (120), and a spiral separator (122) arranged between the feeding pipe (110) and the discharging pipe (130); a slurry separation device (300) which comprises a slurry separation main body (320), a feeding joint (310), a liquid discharging assembly (340) and a sludge discharging assembly (330), and the liquid discharging assembly (340) and the sludge discharging assembly (330) are in a relatively sealed state; a turbid gas recovery device (200) which is communicated with the top of the slurry separation main body (320) at a first end and communicated with the inside of the sandstone separation main body (120) at a second end; turbid gas at the top of the slurry separation main body (320) is pumped into the sandstone separation main body (120) by the turbid gas recovery device (200) to be absorbed; a flow guide pipe (123) is vertically arranged at the central position of the inside of the sandstone separation main body (120), the flow guide pipe (123) penetrates through the spiral separator (122), a flow guide opening (1231) is formed in the side wall of the flow guide pipe (123), and the flow guide opening (1231) is located at a position close to the bottom of the spiral separator (122); a plurality of air permeation openings (1221) are formed in the upper end surface of the spiral separator (122), and the turbid gas recovery device (200) is communicated with the plurality of air permeation openings (1221). The sandstone separation main body (120) is arranged in parallel in two, the feeding pipe (110) and the discharging pipe (130) are all three-way pipes, a first electromagnetic valve is arranged in the three-way pipe, and the two first electromagnetic valves are electrically connected. The turbid gas recovery device (200) comprises a recovery main pipe (220) and two recovery branch pipes (210), the first ends of the two recovery branch pipes (210) are communicated with the recovery main pipe (220) through a three-way joint, a second electromagnetic valve is arranged in the three-way joint, the second electromagnetic valve is electrically connected with the first electromagnetic valve, and the second ends of the recovery branch pipes (210) are communicated with the insides of the corresponding sandstone separation main bodies (120). The plurality of air permeation openings (1221) are divided into a plurality of air permeation assemblies according to distribution positions, the plurality of air permeation openings (1221) of the same air permeation assembly are located on the same spiral line, control valves are arranged in the plurality of air permeation assemblies, and the plurality of control valves are alternately adjusted to be in a conducting state. ​ ​ 2. The shielded pressure retaining sewage sludge water gas centrifugal separation system according to claim 1, wherein, ​ 3. The shielded pressure retaining sewage sludge water gas centrifugal separation system of claim 2, wherein, ​ 4. The shielded pressure retaining sewage cement air-water centrifugal separation system of claim 1, wherein, ​ 5. The shielded pressure retaining sewage cement air-water centrifugal separation system of claim 1, wherein, The sludge-water separation main body (320) comprises a relatively fixed separation shell (321), a separation cylinder (322) is rotationally connected in the separation shell (321), a directional rotation spiral conveying auger (323) is arranged in the separation cylinder (322), the spiral conveying auger (323) is attached to the inner wall of the separation cylinder (322) at the edge, a plurality of water permeable holes (3221) are formed in the separation cylinder (322) opposite to the liquid outlet assembly (340), and a plurality of sludge outlet openings (3222) are formed in the separation cylinder (322) opposite to the sludge outlet assembly (330).

6. The shielded pressure retaining sewage cement air-water centrifugal separation system of claim 1, wherein, The sludge outlet assembly (330) comprises a sludge outlet shell (333), the sludge outlet shell (333) is communicated with the lower end of the sludge-water separation main body (320) through a sludge guide cylinder (331), a spiral blade (332) is rotationally connected in the sludge outlet shell (333), and the sludge outlet shell (333) and the sludge guide cylinder (331) are crossly arranged.

7. The shielded pressure retaining sewage cement air-water centrifugal separation system of claim 1, wherein, The liquid outlet assembly (340) comprises a funnel-shaped collecting bucket, the collecting bucket is communicated with a U-shaped liquid discharge pipeline (341) at the lower end, and the opening of the liquid discharge pipeline (341) faces upward.

8. A method for the hydro-aero centrifugal separation of sludge, characterized in that, The shield pressure-maintaining sludge-water gas centrifugal separation system according to any one of claims 1-7 comprises the following steps: S1, pumping shield sewage containing sand and sludge into the sand separation device (100) to separate sand, and the obtained sludge after separation is introduced into the sludge-water separation device (300); S2, the sludge in step S1 is subjected to sludge-water separation in the sludge-water separation main body (320) of the sludge-water separation device (300), to obtain relatively dry sludge and relatively pure sewage; S3, the turbid gas in the sludge-water separation main body (320) is pumped into the sand separation main body (120) by the turbid gas recovery device (200) in a one-way manner.

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