CN115677169A - Three-stage concentration circulating treatment method for shield muddy water - Google Patents
Three-stage concentration circulating treatment method for shield muddy water Download PDFInfo
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- CN115677169A CN115677169A CN202211565352.2A CN202211565352A CN115677169A CN 115677169 A CN115677169 A CN 115677169A CN 202211565352 A CN202211565352 A CN 202211565352A CN 115677169 A CN115677169 A CN 115677169A
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Abstract
The invention discloses a three-stage concentration circulating treatment method of shield muddy water, which comprises the following steps: the slurry balance shield conveys the slag-containing slurry into the secondary screening unit; the screened slurry flows into a sand washing unit of a slurry storage tank and then enters a rotational flow unit, under the rotational flow screening, the underflow slurry is screened and reflowed by a vibration screening and dehydrating unit, and the overflow slurry flows into a precipitation unit for multistage precipitation; concentrating and separating the waste slurry in the waste slurry treatment unit into low specific gravity slurry and high concentration slurry, allowing the low specific gravity slurry to flow into a precipitation unit for multistage precipitation, and allowing the high concentration slurry to flow into a third-stage concentration unit for treatment to obtain filtrate water and a press cake; the slurry after multistage precipitation flows into a slurry mixing unit, and bentonite slurry, clear water and filtrate water are also introduced into the slurry mixing unit to adjust the concentration of the slurry. The invention has the advantages that: the proportion of the circulating slurry is reduced by the centrifugal machine to supplement the cyclone screening, so that the index change of the slurry is slowed down, and the adjustment times of the slurry are reduced.
Description
Technical Field
The invention belongs to the technical field of shield slurry treatment, and particularly relates to a three-stage concentration and circulation treatment method for shield slurry.
Background
The slurry balance shield stabilizes the front soil body by the slurry capable of adjusting the pressure when the shield cuts the front soil body to advance, and because the slurry balance shield is completely in a sealing state in the whole tunneling process, the stability of the slurry balance shield on the stratum is better than that of the slurry balance shield, the slurry balance shield is more and more popular by virtue of better stability and more reliable safety.
The slurry balance shield cuts the front soil body through the cutter head, the cut soil body and the slurry of the excavation bin are mixed and then enter the slurry discharge pipeline through the slurry door arranged at the bottom of the shield, the mixed slurry enters the slurry discharge pipeline and is conveyed to the ground slurry treatment field through the slurry discharge pipeline, and the slurry conveyed to the ground is subjected to multi-stage separation treatment through the slurry treatment field.
When the slurry balance shield is tunneled through the earth strata such as clay, silt, strong weathering, full weathering and the like, the separation index of the cyclone can be reduced due to the fact that the viscosity of slurry is high and the number of fine particles in the slurry is large. The fine clay particles in the slurry treated by the secondary separation equipment are gradually enriched, and if the fine clay particles are not removed in time, the specific gravity and the viscosity of the slurry are increased, so that the slag carrying capacity of the slurry and the pumping capacity of a circulation system are directly reduced, and the tunneling efficiency of the slurry balance shield is further reduced.
It is of utmost importance to control the specific gravity of the mud entering the formation so that it remains relatively stable while the formation is being driven. Instead of having to be replaced by clean water when the specific gravity of the whole circulating slurry is deteriorated, the circulating pump is overloaded and the torque of the shield machine is excessively large and cannot be pushed, so that the phenomenon that a large amount of slurry is discarded due to overflow of the slurry with the capacity exceeding the limit of the slurry circulating system is avoided.
Based on this, a method capable of performing three-stage concentration cycle treatment is urgently needed by those skilled in the art.
Disclosure of Invention
The invention aims to provide a three-stage concentration circulating treatment method for shield slurry according to the defects of the prior art, the three-stage concentration circulating treatment method carries out two-stage concentration through a cyclone unit, and realizes three-stage concentration of slurry through the cooperative work of a filter press and a centrifugal machine, and the three-stage concentration circulating treatment method is used as supplement of cyclone screening, so that the index change of slurry is slowed down, and the slurry adjusting times are reduced.
The purpose of the invention is realized by the following technical scheme:
a three-stage concentration circulating treatment method for shield muddy water is characterized by comprising the following steps: the slurry balance shield utilizes a shield circulation system in the slurry balance shield to convey the slurry containing slag in the tunneling process into a secondary screening unit for screening, and soil blocks and sludge groups larger than 50mm and sand and small sludge groups of 3-50mm are screened out; the screened slurry flows into a slurry storage tank sand washing unit, the slurry storage tank sand washing unit conveys the slurry to a cyclone unit and under the secondary cyclone screening of the cyclone unit, the underflow slurry of the cyclone unit is screened by a vibration screening and dewatering unit to screen 0.045-3mm sand grains and then flows back to the slurry storage tank sand washing unit, and the overflow slurry of the cyclone unit flows into a precipitation unit to carry out multistage precipitation; concentrating and separating waste slurry in the waste slurry treatment unit into low-specific-gravity slurry and high-concentration slurry through a secondary concentration unit, wherein the waste slurry in the waste slurry treatment unit is from waste slurry discharged from the slurry mixing unit, the low-specific-gravity slurry flows into the precipitation unit for multistage precipitation, and the high-concentration slurry flows into a tertiary concentration unit for filter pressing and centrifugal treatment to obtain filter liquor water and a filter press cake formed by filter pressing of sticky particles smaller than 0.045 mm; and the slurry subjected to multistage precipitation flows into a slurry mixing unit, and the slurry mixing unit also receives bentonite slurry and clear water prepared by a pulping unit and filtrate water from the three-stage concentration unit to adjust the slurry concentration so as to keep the slurry concentration in the slurry balance shield pumped by the slurry mixing unit constant.
The pulping unit comprises a clean water tank, a fresh pulp tank and an ash tank, a clean water pump is arranged at a water outlet of the clean water tank, the clean water pump pumps clean water in the clean water tank into the fresh pulp tank and the pulp mixing unit respectively, pulping stirring equipment is arranged in the fresh pulp tank, a pulp supplementing pump is arranged at a pulp outlet of the fresh pulp tank, the pulp supplementing pump pumps out pulp in the fresh pulp tank and pumps the pulp back into the fresh pulp tank to form a circulating pulping pipeline, and a discharge port of the ash tank is connected into the circulating pulping pipeline to add bentonite raw materials; and the slurry supplementing pump is also provided with a pipeline communicated to the slurry mixing unit so as to supplement and inject newly prepared bentonite slurry into the slurry mixing unit.
The slurry mixing unit comprises a slurry mixing tank, slurry mixing and stirring equipment is arranged in the slurry mixing tank, newly prepared bentonite slurry from the new slurry tank is received in the slurry mixing tank, clear water from the clear water tank is received, slurry subjected to multistage sedimentation in the sedimentation unit is received, and filtrate water from the three-stage concentration unit is received in the slurry mixing tank so as to adjust and prepare the slurry meeting the concentration requirement; the mud outlet of the slurry mixing tank is provided with a first pump, a waste slurry outlet is provided with a waste slurry pump, the first pump is communicated to the interior of the slurry balance shield so as to pump the prepared slurry into the slurry balance shield, and the waste slurry pump is communicated to the waste slurry treatment unit so as to pump the high-concentration waste slurry precipitated in the slurry mixing tank to the interior of the waste slurry treatment unit.
The mud water balance shield discharges mud through a second pump, and a distributor is arranged between the second pump and the secondary screening unit; the secondary screening unit comprises a large separator and a pre-screening device, a mud discharge pipeline extending out of the distributor is branched into a first mud discharge branch pipe and a second mud discharge branch pipe, a switching valve is arranged at the branch position, the first mud discharge branch pipe is communicated with the large separator, the second mud discharge branch pipe is communicated with the pre-screening device, and the liquid outlet end of the large separator is communicated with the pre-screening device; the conversion valve controls the sludge discharge branch pipes to be switched according to the stratum into which the slurry balance shield is currently tunneled, if the slurry balance shield is tunneled in a sludge layer, the conversion valve is communicated with the first sludge discharge branch pipe, the large block separator separates out soil blocks or sludge groups with the block diameter larger than 50mm and then enters the pre-screening device for secondary screening, and the pre-screening device screens out sand and stone or small sludge groups with the particle diameter of 3-50 mm; if the slurry balance shield is tunneled in a sand layer or a rock stratum, the conversion valve is communicated with the second sludge discharge branch pipe, and the pre-screening is carried out to screen out sand or small mud groups with the particle size of 3-50 mm.
The slurry storage tank sand washing unit comprises a slurry storage tank and a slurry conveying pump, and the slurry storage tank receives and stores slurry pre-screened by the secondary screening unit;
the cyclone unit comprises a first-stage cyclone group and a second-stage cyclone group, the first-stage cyclone group comprises a first-stage slurry inlet pipe, a first-stage overflow pipe and a plurality of first-stage cyclones, slurry inlets of the first-stage cyclones are connected to the first-stage slurry inlet pipe in parallel, and overflow ports of the first-stage cyclones are connected to the first-stage overflow pipe in parallel; the second-stage swirler group comprises a second-stage overflow pipe and a plurality of second-stage swirlers, the slurry inlet of each second-stage swirler is connected to the first-stage overflow pipe in parallel, and the overflow port of each second-stage swirler is connected to the second-stage overflow pipe in parallel;
the slurry in the slurry storage tank is pumped to the primary slurry inlet pipe by the slurry conveying pump and respectively enters slurry inlets of the primary cyclones, underflow discharge ports of the primary cyclones convey underflow slurry to the vibrating screening and dewatering unit, and overflow ports of the primary cyclones flow overflow slurry into slurry inlets of the secondary cyclones through the primary overflow pipes; the underflow discharge port of each secondary cyclone conveys underflow slurry into the vibratory screening dehydration unit, and the overflow port of each secondary cyclone conveys overflow slurry into the sedimentation tank unit through the secondary overflow pipe; the vibrating screening and dewatering unit screens out sand grains of 0.045-3mm in the underflow slurry and the screened underflow slurry is screened to the slurry storage tank.
The primary cyclone comprises a cyclone shell, a slurry inlet is formed in the side wall of the cyclone shell, and a slurry inlet pipe body is tangent to the cyclone shell; the lower end of the rotational flow shell is provided with the underflow discharge port, the underflow discharge port is provided with a paddle type discharger, the paddle type discharger consists of two rubber sheets with sealed and connected side edges, the upper parts of the two rubber sheets form a circular interface to be connected with the underflow discharge port in a sealed way, and the lower parts of the two rubber sheets are jointed in a separable way; a sleeve box is coaxially arranged at the upper end of the rotational flow shell and is communicated with the inner cavity of the rotational flow shell, and an overflow port and an inner cavity pressure adjusting device are arranged on the sleeve box; the circular interface of the paddle type discharger is sleeved outside the underflow discharge port and is tightly hooped by a hoop to realize sealed connection; the inner cavity pressure adjusting device comprises a pressure release valve and a booster pump; the bottom edge of the rubber sheet is provided with a through hole, and a rubber band with a binding opening is inserted in the through hole.
The lower end of the primary overflow pipe is lower than the paddle type discharger on the primary cyclone; the structure of the secondary cyclone is the same as that of the primary cyclone; the lower end of the secondary overflow pipe is lower than the paddle type discharger on the secondary cyclone in height.
The sedimentation tank unit consists of a plurality of sedimentation tanks which are sequentially communicated, and the liquid outlet of the sedimentation tank at the tail end is communicated to the size mixing tank; the waste slurry treatment unit comprises a waste slurry pool and a waste slurry stirring device arranged in the waste slurry pool, and the waste slurry pump on the slurry mixing pool transfers waste slurry into the waste slurry pool; and a slurry outlet on the waste slurry tank is communicated with the second-stage concentration unit through a slurry conveying pump, the second-stage concentration unit concentrates and separates the waste slurry into low-specific-gravity slurry and high-concentration slurry, wherein the low-specific-gravity slurry is introduced into the sedimentation tank at the initial end, and the high-concentration slurry is introduced into the third-stage concentration unit.
The three-stage concentration unit comprises an underflow tank, a filtrate tank, a filter press and a centrifuge, wherein the underflow tank receives high-concentration slurry conveyed by the second-stage concentration unit, an underflow stirring device is arranged in the underflow tank, two liquid outlets are arranged on the underflow tank, one of the liquid outlets is communicated with the filter press through a filter press pump, the other liquid outlet is communicated with the centrifuge through a third pump, the filter press presses and filters sticky particles smaller than 0.045mm in the high-concentration slurry into cakes, the cakes are conveyed out, filtrate water generated by filter pressing is conveyed into the filtrate tank, and the centrifuge separates the sticky particles smaller than 0.045mm in the high-concentration slurry and conveys the separated filtrate water into the filtrate tank; and conveying the filtrate water in the filtrate tank into the size mixing tank.
The invention has the advantages that:
(1) Adopting a centrifuge and filter press cooperative treatment mode; the proportion of the circulating slurry is reduced in an online mode by a centrifugal machine to supplement cyclone screening, so that the index change of the slurry is slowed down, the slurry adjustment times are reduced, and the pulping cost is saved; treating the discharged waste slurry by using a filter press, introducing an off-line working mode of a centrifugal machine, and performing waste slurry treatment in cooperation with the filter press;
(2) The cyclone is provided with an inner cavity pressure regulating device on an overflow pipeline and a paddle type discharger on an underflow discharge port thereof, so that the underflow density is reasonably regulated, proper slurry is provided for a downstream dewatering screen, and the highest underflow concentration of the cyclone can reach 85%; the inner cavity pressure adjusting device changes along with the changes of the slurry inlet concentration and the slurry inlet pressure, so that the underflow concentration is constant, and the classification efficiency is improved; the siphon action makes the outlet pressure less than ordinary swirler, and the inlet pressure is little thereby reduce the energy consumption.
Drawings
FIG. 1 is a process flow diagram of a three-stage concentration circulating treatment discharging method of shield muddy water in the invention;
FIG. 2 is a schematic structural view of a cyclone unit according to the present invention;
FIG. 3 is a schematic view of the construction of a primary cyclone according to the present invention;
FIG. 4 is a detailed view of a portion of a paddle blade type eductor provided at the underflow discharge outlet of a primary cyclone of the present invention;
FIG. 5 is a front view of a paddle blade type eductor provided at the underflow discharge outlet of a primary cyclone in accordance with the present invention.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example in conjunction with the following drawings to facilitate understanding by those skilled in the art:
referring to fig. 1-5, the symbols in the figures are: the device comprises a rotational flow shell 1, a sleeve box 2, a slurry inlet 3, an overflow port 4, a pressure release valve 5, a booster pump 6, a paddle type discharger 7, a hoop 8, a primary overflow pipe 9 and a binding rubber band 10.
Example (b): as shown in fig. 1, this embodiment specifically relates to a three-stage concentration cycle processing method for shield slurry, which includes the following steps:
the slurry balance shield utilizes a shield circulating system in the slurry balance shield to convey the slurry containing slag in the tunneling process into a secondary screening unit for screening, and soil blocks and sludge groups larger than 50mm and sand and small sludge groups of 3-50mm are screened out;
the screened slurry flows into a slurry storage tank sand washing unit, the slurry storage tank sand washing unit conveys the slurry to a cyclone unit and under the secondary cyclone screening of the cyclone unit, the underflow slurry of the cyclone unit screens sand grains with the size of 0.045-3mm through a vibration screening and dewatering unit and then flows back to the slurry storage tank sand washing unit, and the overflow slurry of the cyclone unit flows into a precipitation unit for multi-stage precipitation;
concentrating and separating the waste slurry in the waste slurry treatment unit into low-specific-gravity slurry and high-concentration slurry through a second-stage concentration unit, wherein the waste slurry in the waste slurry treatment unit is from the waste slurry discharged from a slurry mixing unit, the low-specific-gravity slurry flows into a precipitation unit for multistage precipitation, and the high-concentration slurry flows into a third-stage concentration unit for filter pressing and centrifugal treatment to obtain filter liquor water and a filter press cake formed by filter pressing of sticky particles smaller than 0.045 mm;
the slurry after multistage sedimentation flows into the slurry mixing unit, and the slurry mixing unit also receives bentonite slurry and clear water prepared by the slurry preparation unit and filtrate water from the three-stage concentration unit to adjust the slurry concentration so as to keep the slurry concentration in the slurry balance shield pumped by the slurry mixing unit constant. The determination of the mud concentration can be monitored by means of a hydrometer.
As shown in fig. 1, the implementation of the three-stage concentration cyclic treatment method depends on the whole three-stage concentration cyclic treatment system, and the three-stage concentration cyclic treatment system comprises a pulping unit, a size mixing unit, a waste pulp treatment unit, a secondary screening unit, a pulp storage tank sand washing unit, a cyclone unit, a vibration screening dehydration unit, a sedimentation tank unit, a secondary concentration unit and a three-stage concentration unit; the slurry preparing unit is communicated with the slurry mixing unit, a slurry outlet on the slurry mixing unit is connected to a slurry balance shield to feed slurry, a slurry outlet of the slurry balance shield discharges the slurry and is communicated to the secondary screening unit through a distributor, the secondary screening unit is connected with a slurry storage tank sand washing unit, the slurry storage tank sand washing unit is connected with a rotational flow unit, an underflow outlet of the rotational flow unit is connected to a vibration screening and dewatering unit, the through-screening slurry in the vibration screening and dewatering unit flows back to the slurry storage tank sand washing unit, an overflow outlet of the rotational flow unit is connected to a sedimentation tank unit, the sedimentation tank unit is connected with the slurry mixing unit, a waste slurry transfer outlet of the slurry mixing unit is connected with a waste slurry processing unit, and a liquid outlet of the waste slurry processing unit is respectively connected with the sedimentation tank unit and the third-level concentrating unit through the secondary concentrating unit.
As shown in fig. 1, the slurry making unit comprises a clean water tank, a new slurry tank and an ash tank, wherein bentonite raw materials are stored in the ash tank and used for conveying the bentonite raw materials into the new slurry tank, the clean water tank respectively pumps clean water into the new slurry tank and pumps clean water into a slurry mixing tank of the slurry mixing unit through a clean water pump, a plurality of slurry making and stirring devices are arranged in the new slurry tank, and the bentonite and the clean water are stirred and mixed through the slurry making and stirring devices to prepare bentonite slurry; a slurry supplementing pump is arranged at a slurry outlet of the new slurry pool and is branched into two paths, wherein one path pumps out the bentonite slurry in the new slurry pool and then conveys the bentonite slurry back to the new slurry pool for cyclic slurry preparation, and a discharge port of the ash tank is arranged in the cyclic slurry preparation pipeline to be mixed with the bentonite slurry; the other path is communicated to the size mixing tank to supplement new size to the size mixing tank, namely newly prepared bentonite slurry is supplemented into the size mixing tank.
As shown in fig. 1, the slurry mixing unit includes a slurry mixing tank, a slurry mixing and stirring device is arranged in the slurry mixing tank, a first pump is arranged at a slurry outlet of the slurry mixing tank, a waste slurry pump is arranged at a waste slurry outlet, the first pump is connected to a slurry balance shield to convey the mixed slurry into the slurry balance shield (i.e., to feed the slurry), the waste slurry pump is connected to a waste slurry treatment unit (waste slurry tank), and one pipeline of the clean water pump pumps clean water in the clean water tank into the slurry mixing tank; in the whole process of the three-stage concentration circulating treatment system, slurry subjected to screening and two-stage cyclone screening flows into a slurry mixing tank of a slurry mixing unit after being subjected to multi-stage precipitation by a precipitation tank unit, filtrate water subjected to three-stage concentration treatment flows into the slurry mixing tank, and is mixed and adjusted with newly prepared bentonite slurry and clear water, so that the slurry meeting the requirements is obtained and is pumped into a slurry balance shield.
As shown in fig. 1, a shield circulation pipeline is arranged in the slurry balance shield and used in the tunneling process, slag-containing slurry generated in the tunneling process is discharged through a second pump (a sludge discharge pump) in the shield circulation pipeline, a plurality of slurry treatment lines with the same structure are arranged on site, the discharged slag-containing slurry is distributed through a distributor, and the distributed slag-containing slurry enters a secondary screening unit; the secondary screening unit comprises a massive separator and a pre-screening device, a sludge discharge pipeline extending out of the distributor is branched into a first sludge discharge branch pipe and a second sludge discharge branch pipe, and a switching valve is arranged at the branch of the first sludge discharge branch pipe and the second sludge discharge branch pipe and used for controlling the sludge discharge branch pipes to be connected, wherein the first sludge discharge branch pipe is connected to the massive separator, the second sludge discharge branch pipe is connected to the pre-screening device, and the liquid outlet end of the massive separator is positioned above the material distribution end of the pre-screening device; the conversion valve controls the mud discharging branch pipes to be switched and communicated according to the stratum into which the mud water balance shield is currently tunneled; specifically, the method comprises the following steps:
if the slurry balance shield is tunneled in a sludge layer, it is shown that the slurry containing slag will contain soil blocks with large particle size and sludge clusters, therefore, the conversion valve is communicated with the first sludge discharge branch pipe, the large block separator is specifically of a sludge scraper device structure, the large block separator scrapes out the soil blocks or the sludge clusters with the block size larger than 50mm in the slurry containing slag, the soil blocks or the sludge clusters enter a material distribution end of a pre-screening device for secondary screening, and the pre-screening device screens out sand stones or small sludge clusters with the particle size of 3-50 mm;
if the slurry balance shield tunnels in a sand layer or a rock layer, the conversion valve is controlled to be communicated with the second sludge discharge branch pipe, the sludge-containing slurry enters the material distribution end of the pre-screening device, and the pre-screening device screens out gravels or small mud groups with the particle size of 3-50 mm.
As shown in fig. 1, the slurry storage tank sand washing unit includes a slurry storage tank and a slurry conveying pump, the slurry storage tank receives and stores the slurry pre-screened by the secondary screening unit, and the slurry conveying pump is used for pumping the slurry in the slurry storage tank into the cyclone unit for secondary concentration.
As shown in fig. 1-2, the cyclone unit specifically includes a first-stage cyclone group and a second-stage cyclone group; the primary swirler group comprises a primary slurry inlet pipe, a primary overflow pipe and a plurality of primary swirlers, wherein the slurry inlet of each primary swirler is connected to the primary slurry inlet pipe in parallel, and the overflow port of each primary swirler is connected to the primary overflow pipe in parallel; the second-stage swirler group comprises a second-stage overflow pipe and a plurality of second-stage swirlers, the slurry inlet of each second-stage swirler is connected in parallel to the first-stage overflow pipe, and the overflow ports of each second-stage swirler are connected in parallel to the second-stage overflow pipe. The slurry pump of the slurry storage tank pumps the slurry in the slurry storage tank to the primary slurry inlet pipe and respectively enters the slurry inlets of the primary cyclones, the underflow discharge ports of the primary cyclones convey the underflow slurry to the vibratory screening and dewatering unit, and the overflow ports of the primary cyclones flow the overflow slurry into the slurry inlets of the secondary cyclones through the primary overflow pipes; the underflow discharge port of each secondary cyclone conveys underflow slurry into a vibrating screening dehydration unit, and the overflow port of each secondary cyclone conveys overflow slurry into a sedimentation tank unit through a secondary overflow pipe; the vibrating screening and dewatering unit screens out sand grains of 0.045-3mm in the underflow slurry and the screened underflow slurry flows back to the slurry storage tank through the screen.
As shown in fig. 1-5, the primary cyclone and the secondary cyclone are identical in construction and differ only in some of their dimensional parameters. In this embodiment, the structure of the primary cyclone is taken as an example for explanation, the main body of the primary cyclone is a cyclone casing 1, and a slurry inlet 3 is formed on a side wall surface of the cyclone casing 1; a jacket 2 is coaxially arranged at the upper end of the rotational flow shell 1, and an overflow port 4 and a corresponding inner cavity pressure adjusting device are arranged on the jacket 2; the lower end of the cyclone shell 1 is an underflow discharge port, and a paddle type discharger 7 is communicated with the underflow discharge port; under the combined use of the internal cavity pressure regulating device and the paddle board type discharger 7, the reasonable adjustment of the density of the underflow can be realized, and the proper slurry can be provided for the downstream dewatering screen. The cyclone shell 1 consists of two parts, namely a cylindrical shell at the upper part and a conical shell with a wide upper part and a narrow lower part, wherein a primary slurry inlet pipe is connected to a slurry inlet 3 on the cylindrical shell and is used for conveying slurry into the cyclone shell 1; the upper opening of the rotational flow shell 1 is open and is coaxially arranged with the jacket 2 to be closed, the jacket 2 is provided with an overflow opening 4, the overflow opening 4 is communicated with a primary overflow pipe 9, and the lower opening of the primary overflow pipe 9 is lower than the paddle type discharger 7 on the underflow discharge port so as to utilize the siphon action. The inner chamber pressure adjusting device provided on the jacket 2 is composed of a pressure release valve 5 and a booster pump 6, the pressure release valve 5 can reduce the pressure in the cyclone casing 1, and the booster pump 6 can increase the pressure in the cyclone casing 1, that is, the inner chamber pressure adjusting device can adjust according to the actual pressure value. The paddle discharger 7 connected to the underflow discharge opening of the cyclone casing 1 is similar to a paddle in front view, as shown in fig. 5. The device is composed of two rubber sheets, the side edge parts of the two rubber sheets are connected in a sealing way, the sealing connection mode can be glue bonding or bonding in a high-temperature hot melting mode, the upper parts of the two rubber sheets are combined to form a circular interface and sleeved on an underflow outlet, and meanwhile, the two rubber sheets are clamped and connected in a sealing way through a hoop 8; the lower parts of the two rubber sheets are not bonded, but are in a separable attaching form, namely, the two rubber sheets are extruded to be opened when the grout is discharged, and the two rubber sheets are closed when the grout is not discharged. In order to further improve the joint performance of the two rubber sheets, the bottom edge of the rubber sheet is provided with a hole for the rope to penetrate through, the opening restricting rubber band 10 penetrates through the hole, the lower parts of the two rubber sheets can be tightly jointed under the resilience force of the opening restricting rubber band 10, and the two rubber sheets can be opened only under the extrusion action of the grout. The working method of the primary cyclone mainly comprises the following steps: the primary slurry inlet pipe conveys slurry into the cylindrical shell in a horizontal tangential mode through the slurry inlet 3, and then strong three-dimensional elliptical strong-rotation shearing turbulent flow motion is generated, as the coarse particles, the fine particles and the liquid in the slurry are subjected to different magnitudes of centrifugal force, centripetal buoyancy, fluid drag force and the like and are subjected to centrifugal sedimentation, the coarse particles in the slurry are discharged through the underflow discharge port of the cyclone, and most of the fine particles and the liquid carried by the fine particles are discharged through the primary overflow pipe 9, so that the separation and classification purposes are achieved; it should be noted that, because a certain height difference exists between the lower port of the primary overflow pipe 9 and the paddle type discharger 7, a siphon phenomenon can be generated, and the siphon phenomenon can generate an upward suction force in the cyclone shell 1; the paddle type discharger 7 can seal the inner cavity of the cyclone shell 1, and can control the opening amplitude of two rubber sheets under the action of upward suction force and coarse particle slurry, so as to adjust the concentration change of underflow slurry.
As shown in fig. 1, the sedimentation tank unit is composed of a plurality of sedimentation tanks which are sequentially communicated to perform multistage sedimentation, overflow slurry of the cyclone unit flows into the sedimentation tank at the beginning, and a liquid outlet of the sedimentation tank at the tail end is communicated to the slurry mixing tank to convey the slurry which is subjected to sedimentation into the slurry mixing tank.
As shown in fig. 1, the waste slurry treatment unit includes a waste slurry tank and a plurality of waste slurry stirring devices disposed in the waste slurry tank, and a waste slurry pump on the slurry mixing tank transfers waste slurry into the waste slurry tank; and a slurry outlet on the waste slurry tank is communicated with the second-stage concentration unit through a slurry conveying pump, and the waste slurry output by the waste slurry tank is concentrated and screened through the second-stage concentration unit, namely, the waste slurry is separated into low-specific-gravity slurry and high-concentration slurry, wherein the low-specific-gravity slurry is introduced into a sedimentation tank at the beginning end, and the high-concentration slurry is introduced into the third-stage concentration unit.
As shown in fig. 1, the three-stage concentration unit includes an underflow tank, a filtrate tank, a filter press and a centrifuge, the underflow tank receives high-concentration slurry conveyed by the two-stage concentration unit, an underflow stirring device is disposed in the underflow tank, two liquid outlets are disposed on the underflow tank, one of the liquid outlets is communicated with the filter press through a filter press pump, the other liquid outlet is communicated with the centrifuge through a third pump, the filter press filter-presses sticky particles smaller than 0.045mm in the high-concentration slurry into cakes and conveys the cake out, filtrate water generated by the filter press is conveyed into the filtrate tank, and the centrifuge separates the sticky particles smaller than 0.045mm in the high-concentration slurry and conveys the separated filtrate water into the filtrate tank; and conveying the filtrate water in the filtrate tank into the size mixing tank.
The advantages of this embodiment are:
(1) Adopting a centrifuge and filter press cooperative treatment mode; the proportion of the circulating slurry is reduced in an online mode by a centrifugal machine to supplement cyclone screening, so that the index change of the slurry is slowed down, the slurry adjustment times are reduced, and the pulping cost is saved; treating the discharged waste slurry by using a filter press, introducing an offline working mode of a centrifuge, and performing waste slurry treatment by cooperating with the filter press;
(2) The cyclone is provided with an inner cavity pressure regulating device on an overflow pipeline and a paddle type discharger on an underflow discharge port thereof, so that the underflow density is reasonably regulated, proper slurry is provided for a downstream dewatering screen, and the highest underflow concentration of the cyclone can reach 85%; the inner cavity pressure adjusting device changes along with the changes of the slurry inlet concentration and the slurry inlet pressure, so that the underflow concentration is constant, and the classification efficiency is improved; the siphon action makes the outlet pressure less than ordinary swirler, and the inlet pressure is little thereby reduce the energy consumption.
Claims (9)
1. A three-stage concentration circulating treatment method for shield muddy water is characterized by comprising the following steps: the slurry balance shield utilizes a shield circulating system in the slurry balance shield to convey the slurry containing slag in the tunneling process into a secondary screening unit for screening, and soil blocks and sludge groups larger than 50mm and sand and small sludge groups of 3-50mm are screened out; the screened serous fluid flows into a serous fluid scouring unit of a serous fluid storage tank, the serous fluid scouring unit of the serous fluid storage tank conveys serous fluid to a rotational flow unit, under the secondary rotational flow screening of the rotational flow unit, the underflow serous fluid of the rotational flow unit is screened by a vibrating screening dehydration unit and then flows back to the serous fluid scouring unit of the serous fluid storage tank, and the overflow serous fluid of the rotational flow unit flows into a precipitation unit for multi-stage precipitation; concentrating and separating waste slurry in the waste slurry treatment unit into low-specific-gravity slurry and high-concentration slurry through a secondary concentration unit, wherein the waste slurry in the waste slurry treatment unit is from waste slurry discharged from the slurry mixing unit, the low-specific-gravity slurry flows into the precipitation unit for multistage precipitation, and the high-concentration slurry flows into a tertiary concentration unit for filter pressing and centrifugal treatment to obtain filter liquor water and a filter press cake formed by filter pressing of sticky particles smaller than 0.045 mm; and the slurry subjected to multistage precipitation flows into a slurry mixing unit, and the slurry mixing unit also receives bentonite slurry and clear water prepared by a pulping unit and filtrate water from the three-stage concentration unit to adjust the slurry concentration so as to keep the slurry concentration in the slurry balance shield pumped by the slurry mixing unit constant.
2. The three-stage concentration circulation treatment method for shield slurry according to claim 1, wherein the slurry preparation unit comprises a clean water tank, a fresh slurry tank and an ash tank, a clean water pump is arranged at a water outlet of the clean water tank, the clean water pump pumps clean water in the clean water tank into the fresh slurry tank and the slurry mixing unit respectively, a slurry preparation stirring device is arranged in the fresh slurry tank, a slurry supplement pump is arranged at a slurry outlet of the fresh slurry tank, the slurry supplement pump pumps slurry in the fresh slurry tank out and pumps the slurry back into the fresh slurry tank to form a circulation slurry preparation pipeline, and a discharge port of the ash tank is connected into the circulation slurry preparation pipeline to add bentonite raw materials; and the slurry supplementing pump is also provided with a pipeline communicated to the slurry mixing unit so as to supplement and inject newly prepared bentonite slurry into the slurry mixing unit.
3. The three-stage concentration circulation treatment method for shield slurry according to claim 2, wherein the slurry mixing unit comprises a slurry mixing tank, a slurry mixing and stirring device is arranged in the slurry mixing tank, and the slurry mixing tank receives newly prepared bentonite slurry from the new slurry tank, clear water from the clear water tank, slurry from the precipitation unit after multistage precipitation and filtrate water from the three-stage concentration unit so as to adjust and prepare slurry meeting concentration requirements; the mud outlet of the slurry mixing tank is provided with a first pump, a waste slurry outlet is provided with a waste slurry pump, the first pump is communicated to the interior of the slurry balance shield so as to pump the prepared slurry into the slurry balance shield, and the waste slurry pump is communicated to the waste slurry treatment unit so as to pump the high-concentration waste slurry precipitated in the slurry mixing tank to the interior of the waste slurry treatment unit.
4. The three-stage concentration circulation treatment method for shield slurry according to claim 3, wherein the slurry balance shield is discharged by a second pump, and a distributor is arranged between the second pump and the secondary screening unit; the secondary screening unit comprises a large separator and a pre-screening device, a mud discharge pipeline extending out of the distributor is branched into a first mud discharge branch pipe and a second mud discharge branch pipe, a switching valve is arranged at the branch position, the first mud discharge branch pipe is communicated with the large separator, the second mud discharge branch pipe is communicated with the pre-screening device, and the liquid outlet end of the large separator is communicated with the pre-screening device; the conversion valve controls the mud discharging branch pipes to be switched according to the stratum into which the mud balance shield is currently tunneled, if the mud balance shield is tunneled in a mud layer, the conversion valve is communicated with the first mud discharging branch pipe, the large block separator separates out soil blocks or mud groups with the block diameter larger than 50mm and then enters the pre-screening device for secondary screening, and the pre-screening device screens out sand and stone or small mud groups with the particle diameter of 3-50 mm; if the slurry balance shield is tunneled in a sand layer or a rock stratum, the conversion valve is communicated with the second sludge discharge branch pipe, and the pre-screening is carried out to screen out sand or small mud groups with the particle size of 3-50 mm.
5. The three-stage concentration circulation treatment method for shield slurry water according to claim 4, wherein the slurry storage tank sand washing unit comprises a slurry storage tank and a slurry conveying pump, and the slurry storage tank receives and stores slurry pre-screened by the secondary screening unit;
the cyclone unit comprises a first-stage cyclone group and a second-stage cyclone group, the first-stage cyclone group comprises a first-stage slurry inlet pipe, a first-stage overflow pipe and a plurality of first-stage cyclones, slurry inlets of the first-stage cyclones are connected to the first-stage slurry inlet pipe in parallel, and overflow ports of the first-stage cyclones are connected to the first-stage overflow pipe in parallel; the second-stage swirler group comprises a second-stage overflow pipe and a plurality of second-stage swirlers, the slurry inlet of each second-stage swirler is connected to the first-stage overflow pipe in parallel, and the overflow port of each second-stage swirler is connected to the second-stage overflow pipe in parallel;
the slurry conveying pump is used for pumping the slurry in the slurry storage tank to the primary slurry inlet pipes and respectively enters the slurry inlets of the primary cyclones, the underflow discharge ports of the primary cyclones are used for conveying the underflow slurry to the vibrating screening and dewatering unit, and the overflow ports of the primary cyclones are used for flowing the overflow slurry into the slurry inlets of the secondary cyclones through the primary overflow pipes; the underflow discharge port of each secondary cyclone conveys underflow slurry into the vibratory screening dehydration unit, and the overflow port of each secondary cyclone conveys overflow slurry into the sedimentation tank unit through the secondary overflow pipe; the vibrating screening and dewatering unit screens out sand grains with the size of 0.045-3mm in the underflow slurry, and the screened underflow slurry is screened through to the slurry storage tank.
6. The three-stage concentration cycle treatment method for shield slurry water according to claim 5, wherein the primary cyclone comprises a cyclone casing, a slurry inlet is formed in a side wall of the cyclone casing, and a slurry inlet pipe body is tangential to the cyclone casing; the lower end of the rotational flow shell is provided with the underflow discharge port, the underflow discharge port is provided with a paddle type discharger, the paddle type discharger consists of two rubber sheets with sealed and connected side edges, the upper parts of the two rubber sheets form a circular interface to be connected with the underflow discharge port in a sealed way, and the lower parts of the two rubber sheets are jointed in a separable way; a sleeve box is coaxially arranged at the upper end of the rotational flow shell and is communicated with the inner cavity of the rotational flow shell, and an overflow port and an inner cavity pressure adjusting device are arranged on the sleeve box; the circular interface of the paddle type discharger is sleeved outside the underflow discharge port and is tightly hooped by a hoop to realize sealing connection; the inner cavity pressure regulating device comprises a pressure relief valve and a booster pump; the bottom edge of the rubber sheet is provided with a through hole, and a rubber band with a binding opening is inserted in the through hole.
7. The three-stage concentration and circulation treatment method for shield slurry according to claim 6, wherein the lower end of the primary overflow pipe is arranged at a height lower than that of the paddle type discharger on the primary cyclone; the structure of the secondary cyclone is the same as that of the primary cyclone; the lower end of the secondary overflow pipe is lower than the paddle type discharger on the secondary cyclone in height.
8. The three-stage concentration circulation treatment method for shield slurry according to claim 5, wherein the sedimentation tank unit comprises a plurality of sedimentation tanks which are sequentially communicated, and liquid outlets of the sedimentation tanks at the tail ends are communicated to the size mixing tank; the waste slurry treatment unit comprises a waste slurry pool and a waste slurry stirring device arranged in the waste slurry pool, and the waste slurry pump on the slurry mixing pool transfers waste slurry into the waste slurry pool; and a slurry outlet on the waste slurry tank is communicated with the second-stage concentration unit through a slurry conveying pump, the second-stage concentration unit concentrates and separates the waste slurry into low-specific-gravity slurry and high-concentration slurry, wherein the low-specific-gravity slurry is introduced into the sedimentation tank at the initial end, and the high-concentration slurry is introduced into the third-stage concentration unit.
9. The three-stage thickening cycle processing method of shield slurry according to claim 8, wherein the three-stage thickening unit comprises an underflow tank, a filtrate tank, a filter press and a centrifuge, the underflow tank receives the high-concentration slurry delivered by the second-stage thickening unit, an underflow stirring device is arranged in the underflow tank, two liquid outlets are arranged on the underflow tank, one of the liquid outlets is communicated with the filter press through a filter-pressing pump, the other liquid outlet is communicated with the centrifuge through a third pump, the filter press presses and filters the sticky particles smaller than 0.045mm in the high-concentration slurry into cakes and delivers the filtrate water generated by filter pressing into the filtrate tank, and the centrifuge separates the sticky particles smaller than 0.045mm in the high-concentration slurry and delivers the separated filtrate water into the filtrate tank; and conveying the filtrate water in the filtrate tank into the size mixing tank.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117127996A (en) * | 2023-10-27 | 2023-11-28 | 北京建工土木工程有限公司 | Movable tunneling machine muddy water circulating system and method for tunnel pump house excavation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117127996A (en) * | 2023-10-27 | 2023-11-28 | 北京建工土木工程有限公司 | Movable tunneling machine muddy water circulating system and method for tunnel pump house excavation |
| CN117127996B (en) * | 2023-10-27 | 2023-12-22 | 北京建工土木工程有限公司 | Movable tunneling machine muddy water circulating system and method for tunnel pump house excavation |
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