CN113582505A - Continuous type high-water-content mud decrement hardening system and method - Google Patents
Continuous type high-water-content mud decrement hardening system and method Download PDFInfo
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- CN113582505A CN113582505A CN202110890815.1A CN202110890815A CN113582505A CN 113582505 A CN113582505 A CN 113582505A CN 202110890815 A CN202110890815 A CN 202110890815A CN 113582505 A CN113582505 A CN 113582505A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
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Abstract
The invention discloses a continuous high-water-content slurry decrement hardening system and method, which comprises a flocculation pipe connected with slurry, wherein the other end of the flocculation pipe is sequentially connected with a pressure regulating system and a pressure pump, the other end of the pressure pump is connected with a filtering pipeline, a vacuum pipe is sleeved outside the filtering pipeline, flowmeters are respectively arranged on the flocculation pipe and the filtering pipeline, and a plurality of dosing systems are connected on the flocculation pipe. According to the invention, through coagulation, flocculation and suction filtration, the effect of rapid reduction of slurry is achieved, and the addition of the hardening agent enables the product to have strength within a certain time, so that the soil material meeting transportation conditions and realizing resource utilization is achieved; the effects of hardening, coagulation and flocculation stirring are ensured by controlling the Reynolds number; the effect of continuous work is achieved by matching the Reynolds number with the timing switch device; the mud does not need to be treated, and mud-water separation is completed in the pipeline flowing process, so that land resources are saved; the device is simple and can be carried on a vehicle; the mud is hardened into a soil material capable of being recycled in one step while being reduced.
Description
Technical Field
The invention relates to a mud decrement hardening recycling system and method, in particular to a continuous mud decrement hardening system and method with high water content.
Background
In the water environment treatment process of China, the dredging (desilting) of polluted bottom mud is a necessary part. The slurry produced by cutter-suction dredging or hydraulic scouring is over 50 hundred million each year, contains a large amount of clay and pollutants, and has the problems of difficult dehydration and sedimentation, lack of site disposal, possibility of secondary pollution, difficult resource utilization of treated products and the like. Therefore, the engineering needs a technical method for quickly separating mud and water from low-concentration mud.
The existing method for quickly separating mud from water mostly adopts an intermittent working mode, and after one batch of mud is treated, the next batch of mud can be treated, so that the efficiency is lower; the cleaning mode of the clogging mud skin mainly adopts a back flush blowing-off mode or utilizes self-weight dehydration, and the mud skin is solidified through evaporation and self-weight, on one hand, the efficiency of the mode of washing the mud skin is low, and the suction filtration process needs to be interrupted for cleaning; on the other hand, the cleaning efficiency is low, and a washing dominant channel is easy to appear, so that the rest part of the mud skin is not washed cleanly; the slurry needs to be processed in a field, and is difficult to apply to projects lacking the field; in addition, the separated slurry has low strength and is difficult to be recycled.
Aiming at the problems, the mud-water separation method which has the advantages of higher mud reduction, no occupation of the field and direct resource utilization of the treated mud is urgently needed to be found for solving the problems of low intermittent efficiency, low mud skin cleaning efficiency, the field where the mud needs to be dewatered, low mud dewatering speed, difficult resource utilization of mud treatment products and the like of the existing mud dewatering method.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a continuous type slurry decrement hardening system with high water content and a method thereof, which can reduce the amount of low-concentration slurry and simultaneously process the slurry into a soil material with strength in one step.
The technical scheme is as follows: the invention comprises a flocculation pipe connected with slurry, wherein the other end of the flocculation pipe is sequentially connected with a pressure regulating system and a pressure pump, the other end of the pressure pump is connected with a filtering pipeline, a vacuum pipe is sleeved outside the filtering pipeline, flow meters are respectively arranged on the flocculation pipe and the filtering pipeline, and a plurality of dosing systems are connected on the flocculation pipe.
The dosing system comprises a hardening agent dosing system and a coagulation and flocculant dosing system which are respectively arranged at the front part and the middle front part of the flocculation tube.
The dosing system adopts a multipoint injection dosing mode, and the dosage and the type of the medicament are obtained through a pilot test.
The vacuum tube is connected with a vacuum device, and a timing switch device is arranged on a connecting pipeline of the vacuum tube and used for controlling the timing switch of the vacuum device.
The filter pipeline is provided with a plurality of small holes at the periphery, and a filter medium is arranged in the filter pipeline and clings to the inner wall of the filter pipeline.
The pressure regulating system regulates the pressure of the pressure pump according to the Reynolds coefficient.
A continuous type slurry decrement hardening method with high water content comprises the following steps:
(1) sampling, performing small-scale test on the sample to obtain the types and the dosages of the hardening agent and the flocculating agent, continuing the test on the basis to obtain the types and the dosages of the flocculating agent, and obtaining a flocculation formula according to the small-scale test;
(2) installing the system on the site, or driving the system installed on the working vehicle to the site;
(3) the system is debugged, a pressure pump, a flowmeter, a pressure regulating system and a circulating operation system are started, after the Reynolds numbers of two sections of the system reach set requirements, a chemical adding system and a vacuum device are started to flocculate and pump-filter the system, so that the mud peels fall off, and the subsequently pumped mud washes the fallen mud peels off a pipeline;
(4) and after the mud-water separation is finished, conveying the mud skin with the strength which is gradually hardened to a site needing resource utilization, and detaching the system from the site or taking the system installed on the operation vehicle away from the site.
The step (1) is to obtain the median diameter d of the slurry50The flocculant is not less than 350 μm in type and dosage.
Reynolds numbers of two sections of the system in the step (3) meet: the Reynolds number Re of the slurry entering the flocculation tube is 2500-5000, and the Reynolds number Re of the slurry leaving the system is 2000-2500.
Has the advantages that:
(1) through coagulation, flocculation and suction filtration, the effect of rapid reduction of the slurry can be achieved, and the addition of the hardening agent can enable the product to have strength within a certain time, so that the soil material meeting transportation conditions and resource utilization is achieved;
(2) the effects of hardening, coagulation and flocculation stirring can be ensured by controlling the Reynolds number; the effect of continuous work is achieved by controlling the Reynolds number to be matched with the timing switch device;
(3) the mud does not need to be treated, and mud-water separation is completed in the pipeline flowing process, so that land resources are saved;
(4) the device is simple and easy, can be on-vehicle, and the convenience is gone into the field work in mud takes place the region.
Drawings
FIG. 1 is a schematic diagram of the principles of the present invention;
FIG. 2 is a schematic view of the overall structure of the present invention;
FIG. 3 is a schematic view of a filter conduit according to the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in figure 2, the invention comprises a pressure pump 1, a flowmeter 2, a flocculation pipe 3, a hardening agent dosing system 4, a coagulation and flocculant dosing system 5, a filtering pipeline 6, a vacuum pipe 7, a vacuum device 8, a pressure regulating system 9 and a timing switch device 10, wherein the flocculation pipe 3 adopts a snake-shaped flocculation pipe and is used for uniformly mixing slurry with a hardening agent, a flocculation agent and a flocculant, one end of the snake-shaped flocculation pipe is connected with the slurry needing slurry-water separation, the other end of the snake-shaped flocculation pipe is sequentially connected with the pressure regulating system 9 and the pressure pump 1, the pressure pump 1 is used for regulating the slurry conveying pressure so that the slurry conveying speed in the system can be regulated, and the pressure regulating system 9 controls the pressure pump 1 to regulate the pressure of the pressure pump according to the Reynolds coefficient. The adjusting basis is as follows: controlling the Reynolds number Re of the slurry entering the snakelike flocculation tube to be 2500-5000; and controlling the Reynolds number Re of the slurry to be between 2000 and 2500 immediately before the slurry leaves the system.
The Reynolds number Re is calculated by the formula:
where ρ is the density of the fluid (kg/m)3) And v is the average velocity (m/s) of the fluid, DHIs the hydraulic radius (m) of the pipe, and μ is the dynamic viscosity of the fluid (Pa · s — N · s/m)2Kg/(m · s)). For the slurry in the serpentine flocculation tube, the average velocity v of the fluid is measured by a flow meter installed in the middle of the serpentine flocculation tube, DHThe hydraulic radius of the pipeline is calculated according to the shape of the pipe of the snakelike flocculation pipe, the density rho and the dynamic viscosity mu of the fluid are conservative values according to empirical values, wherein the density rho of the fluid is 1030 (kg/m)3) The dynamic viscosity μ is 0.0016(Pa · s); for the slurry leaving the system, the average velocity v of the fluid is measured by a flow meter mounted at the end of the slurry transport filter pipe, DHThe hydraulic radius of the pipeline is calculated according to the shape of the pipe of the filtering pipeline, the density rho and the dynamic viscosity mu of the fluid are conservative values according to empirical values, wherein the density rho of the fluid is 1160 (kg/m)3) The dynamic viscosity μ was 0.0205 (pas).
The other end of the pressure pump 1 is connected with a filter pipeline 6 for conveying and filtering the slurry. The vacuum pipe 7 is sleeved outside the filter pipeline 6 and used for providing filter negative pressure for the filter pipeline 6 for conveying slurry and guiding out filtered water, the vacuum pipe 7 is connected with the vacuum device 8 and provides a vacuum environment for the vacuum pipe 7, the timing switch device 10 is arranged on the connecting pipeline and controls the timing switch of the vacuum device 8, the vacuum device 8 can be controlled to pump for 5s, and the frequency switch of 1s is stopped, so that mud peels on the filter pipeline 6 are washed and fall off, and the frequency can be properly changed according to the specific condition during slurry suction filtration; the timing switch device 10 enables the mud skin to be flushed out of the pipeline by mud pumped subsequently after falling off from the conveying pipeline 6, so that blockage is avoided, the pipeline does not need to be replaced frequently, and continuous operation is formed.
The tail end of the filtering pipeline 6 and the middle part of the flocculation pipe 3 are respectively provided with a flowmeter 2 which is respectively used for monitoring the flow rate of the mud at the tail end of the mud conveying and filtering pipeline and the flow rate of the mud in the middle of the snake-shaped flocculation pipe, and a pressure adjusting system 9 controls a pressure pump 1 by receiving the real-time mud flow rate data of the flowmeter 2, so that the transport speed of the mud in the system is adjusted. The shape of the filtering pipeline 6 is not fixed, and can be a mosquito-repellent incense shape or a straight shape, and the filtering pipeline needs to be manufactured into a corresponding shape according to practical application. Through and dense small holes 12 are formed in the periphery of the filter tube, a filter medium 11 is arranged in the tube, as shown in figure 3, the filter medium 11 is tightly attached to the inner wall of the filter tube 6, and the filter tube 6 can be detached and replaced, so that the filter tube is convenient to clean.
The flocculation tube 3 is sequentially connected with a hardening agent dosing system 4 and a coagulation and flocculant dosing system 5 which are respectively arranged at the front part and the middle front part of the snake-shaped flocculation tube, the dosing system adopts a multipoint injection dosing mode and is dosed in two stages, the hardening agent dosing system 4 at one stage is arranged at the front end of the snake-shaped flocculation tube, the coagulation and flocculant dosing system 5 at the middle front end of the snake-shaped flocculation tube is added with a flocculation agent or a flocculant. The dosage and the type of the medicament are obtained through a small test, wherein in a formula obtained through the small test, a cement hardener is added, and an inorganic coagulant is added, so that the Zeta potential of the slurry is close to-5 (mV); the polymeric flocculant added on the basis of the Zeta potential is used for ensuring the median particle diameter d of the slurry50Not less than 350 (mu m).
Whole mud processing system mountable is on the car, can open during the operation to the mud processing scene, and demountable installation also can use on the car at the field usage, links to each other with snakelike flocculation pipe with sending the thick liquid pipeline and can begin work, and the mountable is driven away on the car after the end operation, and the installation is transported conveniently, is convenient for remove.
The use method of the system comprises the following steps:
the first step is as follows: sampling on-site dredging mud, and carrying out a small test on the sample in a laboratory to obtain the types and the dosages of a hardening agent and a coagulant which enable the Zeta potential of the mud to be close to-5 (mV); based on the hardener, the coagulant and the addition amount, the test was continued to obtain the median diameter d of the slurry50The type and dosage of the flocculating agent is not less than 350 (mu m), and the current flocculating formula is obtained according to a small test.
The second step is that: the system is installed on site, or the system already installed on the work vehicle is driven to the site.
The third step: for the project adopting the cutter suction type dredging mode on site, the snake-shaped flocculation pipe can be directly connected with a dredging pipeline; for the engineering of adopting hydraulic scouring dredging on site, the snakelike flocculation pipe can be connected with the slurry confluence part generated on site.
The fourth step: the system is debugged, a pressure pump, a flowmeter, a pressure regulating system and a circulating operation system are started, when the Reynolds numbers of two sections of the system reach set requirements, namely the Reynolds number Re of slurry entering a snakelike flocculation tube is 2500-5000, the Reynolds number Re of the slurry leaving the system is 2000-2500, a chemical adding system is started simultaneously, a vacuum device starts flocculation suction filtration on the system, a timing switch device controls a vacuum supply device to be closed for 1s every 5s, so that mud peels off, the subsequently pumped slurry washes the fallen mud peels off a pipeline, blockage is prevented, and continuous operation is formed. Under the operation of the system, the dredged slurry is rapidly changed into thick mud, the thick mud can be rapidly hardened due to the existence of the hardening agent and becomes a soil material which has certain strength, meets the transportation requirement and is recycled, and water pumped out by the system process can be directly returned to rivers and lakes or enter a rainwater system, as shown in figure 1.
The fifth step: after the mud-water separation is completed, the mud skins which are gradually hardened and have strength can be transported to a site needing resource utilization by following processes, and the system is detached from the site or the system installed on the operation vehicle is separated from the site.
Example (b):
firstly, sampling on-site dredging mud, and carrying out a bench test on the sample in a laboratory to obtain the types and the dosages of a hardening agent and a coagulant which enable the Zeta potential of the mud to be close to-5 (mV), for example, 0.001mol/L of aluminum sulfate is adopted for the mud of the Taihu lake sludge, and 0.5g/kg of cement hardening agent is added; on the basis of the hardening agent and the coagulant, the test was continued to obtain the median diameter d of the slurry50Flocculant types and dosages not less than 350 (mu m), such as polyacrylamide in an amount of 0.025% for Taihu lake sludge slurry. According to pilot experiments, the present flocculation formulation, e.g. 0.001mol/L aluminium sulphate in this example in combination with 0.025% polyacrylamide, was obtained for use in the hardener dosing system 4 and the coagulation and flocculant dosing system 5, respectively.
The system is installed on the site, or the system installed on the operation vehicle is driven to the site, and for the project adopting the cutter suction type dredging mode on the site, the flocculation pipe 3 can be directly connected with the dredging pipeline; for the project of using hydraulic scouring dredging on site, the flocculation pipe 3 can be connected with the confluence of slurry generated on site; the method comprises the steps of debugging a system, starting a pressure pump 1, a flowmeter 2 and a pressure regulating system 9, circularly operating the system, starting a hardening agent feeding system 4, a coagulation and flocculant feeding system 5 and a vacuum device 8 when Reynolds numbers of two sections of the system reach set requirements, namely Reynolds numbers Re of slurry entering a flocculation tube 3 are between 2500-5000 and Reynolds numbers Re of the slurry leaving the system are between 2000-2500, starting flocculation and suction filtration of the system, starting a timing switch device 10 to control the on-off of the vacuum device 8 at a frequency of 5s per opening and 1s per closing to enable mud to fall off, and flushing the fallen mud off a pipeline by the subsequently pumped slurry to form continuous operation; in the suction filtration process, the Reynolds number of the system will change, the pressure regulating system 9 can monitor the data of the flowmeter 2 in real time, correspondingly adjust the pressure pump 1, and adjust the timing switch device 10 to control the switching frequency of the vacuum device 8.
If the Reynolds number Re in the flocculation pipe 3 is less than 2500, the slurry is represented as laminar flow, the flow rate is slow, the slurry is thick, the treatment efficiency is low, the pressure regulating system 9 regulates the pressure pump 1 to increase the pressure so that the flow rate is fast, and if Re is too large, the pressure is reduced; if the Reynolds number Re of the slurry at the tail part of the slurry filtering pipeline is more than 2500, the slurry treatment effect is poor, the water content does not reach the expectation, the timing switch device 10 is adjusted to be switched from 1s every 5s to 1s every 7s, and simultaneously the pressure is fed back to the pressure regulating system 9, the pressure of the pressure pump 1 is reduced, and the whole system is dynamically fed back and balanced in time to form continuous operation.
In the whole suction filtration process, the Reynolds number always meets the Reynolds number Re of slurry entering the flocculation tube 3 between 2500 and 5000, and the Reynolds number Re of the slurry leaving the system is between 2000 and 2500, so that the flocculation effect is ensured, and the suction filtration efficiency and quality are also ensured; after the suction filtration process is finished, the thick mud can be quickly hardened due to the existence of the hardening agent, and becomes a soil material which has certain strength, meets the transportation requirement and can be recycled; the water pumped and filtered by the system can directly return to the river or sea or enter a rainwater system; after the mud-water separation is completed, the mud skins with strength which are gradually hardened are transported to a site needing resource utilization by the following process, and the system is detached from the site or is removed from the site.
Claims (9)
1. The utility model provides a continuous type high moisture content mud decrement hardening system, its characterized in that includes flocculation pipe (3) that links to each other with mud, the other end of flocculation pipe (3) is connected with pressure regulation system (9) and force pump (1) in proper order, the other end and the filter tube way (6) of force pump (1) link to each other, the outside cover of filter tube way (6) has vacuum tube (7), flocculation pipe (3) and filter tube way (6) on all install flowmeter (2), be connected with a plurality of medicine systems on flocculation pipe (3).
2. The continuous type mud decrement hardening system with high water content according to claim 1, characterized in that the dosing system comprises a hardening agent dosing system (4) and a coagulation and flocculant dosing system (5) which are respectively arranged at the front part and the middle front part of the flocculation tube (3).
3. The continuous high water content mud weight-reduction hardening system according to claim 1 or 2, wherein the dosing system adopts a multi-point injection dosing mode.
4. The continuous high-water-content mud decrement hardening system according to claim 1, characterized in that the vacuum tube (7) is connected with a vacuum device (8), and a timing switch device (10) is arranged on the connecting pipeline.
5. The continuous type slurry decrement hardening system with high water content according to claim 1, characterized in that a plurality of small holes (12) are formed around the filtering pipe (6), a filtering medium (11) is installed inside the filtering pipe (6), and the filtering medium (11) is tightly attached to the inner wall of the filtering pipe (6).
6. The continuous high-water-content mud decrement hardening system according to the claim 1, characterized in that the pressure adjusting system (9) adjusts the pressure of the pressure pump (1) according to the Reynolds coefficient.
7. A continuous type slurry decrement hardening method with high water content is characterized by comprising the following steps:
(1) sampling, performing small-scale test on the sample to obtain the types and the dosages of the hardening agent and the flocculating agent, continuing the test on the basis to obtain the types and the dosages of the flocculating agent, and obtaining a flocculation formula according to the small-scale test;
(2) installing the system on the site, or driving the system installed on the working vehicle to the site;
(3) the system is debugged, a pressure pump, a flowmeter, a pressure regulating system and a circulating operation system are started, after the Reynolds numbers of two sections of the system reach set requirements, a chemical adding system and a vacuum device are started to flocculate and pump-filter the system, so that the mud peels fall off, and the subsequently pumped mud washes the fallen mud peels off a pipeline;
(4) and after the mud-water separation is finished, conveying the mud skin with the strength which is gradually hardened to a site needing resource utilization, and detaching the system from the site or taking the system installed on the operation vehicle away from the site.
8. The continuous type slurry decrement hardening method with high water content according to claim 7, characterized in that the step (1) is carried out to obtain the median diameter d of the slurry50The flocculant is not less than 350 μm in type and dosage.
9. The continuous type slurry decrement hardening method with high water content according to claim 7, characterized in that Reynolds numbers of two sections of the system in the step (3) satisfy: the Reynolds number Re of the slurry entering the flocculation tube is 2500-5000, and the Reynolds number Re of the slurry leaving the system is 2000-2500.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116078017A (en) * | 2022-12-15 | 2023-05-09 | 中交疏浚技术装备国家工程研究中心有限公司 | Method for filtering and draining mud entering cabin of trailing suction hopper dredger and implementation device thereof |
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| CN113582505B (en) | 2023-03-21 |
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