CN212334986U - Sea reclamation solidified soil composition production parameter model test equipment - Google Patents
Sea reclamation solidified soil composition production parameter model test equipment Download PDFInfo
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Abstract
The utility model relates to a sea reclamation solidified soil composition production parameter model test device, which comprises a sludge storage tank, a flocculating agent stirring tank, a flocculating agent storage tank, a spherical mixing tee joint, a static mixer and a product output tank; the flocculating agent stirring tank is communicated with the flocculating agent storage tank; the sludge storage tank and the flocculant storage tank are respectively connected with two interfaces of the spherical mixing tee joint, and the other interface of the spherical mixing tee joint is communicated with the static mixer; the static mixer is communicated with the product output tank; the product output tank is provided with a viscosity sensor and a turbidity sensor. The test equipment is convenient to obtain the optimal production equipment size and the optimal output flow of the sludge and the flocculant solution, is beneficial to batch production of the optimal sea-filling solidified soil composition, adopts automatic control and automatic data acquisition in the whole process, can greatly save manpower in actual engineering, and saves the labor cost of sea-filling engineering.
Description
Technical Field
The utility model belongs to civil engineering and hydraulic engineering field especially relates to a novel sea reclamation solidified soil composition production parameter model test equipment.
Background
The sea reclamation project is an important measure for fully utilizing ocean resources and guaranteeing the development of economy and society, and greatly relieves the objective contradiction between the rapid economic development and the insufficient land resource supply in coastal areas.
The land reclamation project of China is implemented in the fifth and sixty years of the last century, and large-scale land reclamation is started from the 80 th year of the last century. The sea reclamation project not only presents a situation of increasing year by year in China, but also is implemented successively in a plurality of island countries and coastal countries in the world. For example, the netherlands begin to carry out sea reclamation projects as early as the 13 th century, and the area of the netherlands sea reclamation projects accounts for twenty percent of the territorial area nowadays. Since the economic and rapid growth period in japan, large-scale reclamation of land by sea has been emerging, and the development and use of urban functions mainly for transportation, housing, business, information, culture, entertainment, and the like have been shifted from industrial development to diversified development and use.
Currently, sea reclamation mainly refers to the activities of coffering a dam around a coastal shallow water area or an island, and then pouring a large amount of sand and stones into the sea to build a land or construct an artificial island. At present, the problem of land for large-scale harbors and harbor facing industry construction is solved by adopting a measure of sea reclamation. The dredger filling method for dredging silt in ports and channels is widely applied to sea filling land reclamation, but most dredger filling foundations are silt and silt soft clay, the water content and the compressibility are very large, uniform settlement of foundations is difficult to guarantee when buildings or structures are built on the dredger filling land reclamation foundation, the thicknesses of the foundations are large, the strength is very low, and the dredger filling land reclamation method belongs to ultra-soft foundations, and therefore a series of problems that the construction period of sea filling areas and the structures are long, the construction difficulty is large, the construction cost is high and the like are caused. The drainage consolidation method and the dynamic compaction method adopted in the past for treating ultra-soft foundation (deep soft soil layer) can not obtain ideal reinforcement effect in practical application, the construction period is long, a large amount of manpower and material resources need to be input, although the technology such as rapid reinforcement of shallow surface layer can improve the soil body strength of the surface layer of the foundation in a short time, the soil body strength can not be ensured due to certain problems and defects in system setting, the effective reinforcement depth is insufficient, and the potential safety hazard can be brought to the subsequent engineering construction.
Over a century, and particularly since the evolution of the open, with the development of society and the rapid growth of coastal economy, the number of dredged sludges produced by port, channel, ocean coast engineering to dump into the ocean has also increased. At present, it is increasingly difficult to divide a sea dumping area for large-scale dredging engineering at a river mouth and an offshore area, and dredging sludge dumping becomes an obstacle for the development of ports, navigation channels and ocean coastal engineering in future.
The sea filling material composition for sea filling construction in coastal areas of China is prepared by mixing the following raw materials in parts by weight: 1-5 parts of sludge; 1-5 parts of tailing sand; 1-5 parts of carbon slag; 0.04-0.06 of cement; nonionic surfactant 0.004-0.006; the moisture content of the sludge is 70-90%. With the reduction of natural resources and the enhancement of environmental awareness of people, river sand is more and more difficult to mine, and the river sand is more and more uneconomical to use as a sea-filling material due to the rising price and the prolonging of transportation distance. Therefore, the sea reclamation materials become important cost factors for the development and construction of some sea reclamation projects, particularly large sea reclamation projects.
How to solve the three contradictions and scientifically utilize a great deal of waste dredged sludge resource, relieve the shortage of sea-filling materials and improve the construction efficiency of sea-filling and land-making engineering is a problem to be solved urgently.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems of difficult river sand exploitation, large sludge waste amount and the like in the sea filling material in the prior art, the sea filling solidified soil composition production parameter model test equipment based on sludge and flocculating agents is provided, and then the optimal size of the production equipment and the optimal output flow of the sludge and the flocculating agents are obtained.
In order to realize the technical purpose, the utility model discloses a following technical scheme:
the utility model relates to a sea filling solidified soil composition, including the mass percent be 90.0 ~ 99.9% silt and the mass percent be 0.1 ~ 1% flocculant solution, the dilution ratio of flocculant solution is 0.1% ~ 5%.
The utility model also relates to a sea reclamation solidified soil composition production parameter model test device, which comprises a sludge storage tank, a flocculating agent stirring tank, a flocculating agent storage tank, a spherical mixing tee joint and a product output tank; the output end of the flocculant stirring tank is communicated with the input end of the flocculant storage tank through a pipeline; the output end of the sludge storage tank and the output end of the flocculant storage tank are respectively connected with two interfaces of the spherical mixing tee joint through pipelines; the other connector of the spherical mixing tee joint is communicated with the input end of the product output tank through a pipeline; the product output tank is provided with a viscosity sensor for detecting the viscosity of the composition and a turbidity sensor for detecting the turbidity of the composition; the pipeline on all be equipped with electric valve, on the pipeline of connecting flocculating agent agitator tank and flocculating agent storage jar, on connecting the pipeline of silt storage jar and spherical mixing tee bend, all be equipped with the measuring pump that is used for controlling output flow on connecting the pipeline of flocculating agent storage jar and spherical mixing tee bend.
Silt storage jar, flocculating agent agitator tank, flocculating agent storage jar, product output jar and pipeline all adopt transparent material to make.
Preferably, a static mixer is further arranged between the spherical mixing tee joint and the product output tank, the other interface of the spherical mixing tee joint is communicated with one end of the static mixer, and the other end of the static mixer is communicated with the input end of the product output tank through a pipeline. The static mixer is arranged between the spherical mixing tee joint and the product output tank, so that under the condition of no need of external power, a flocculating agent solution has three functions of shunting, cross mixing and reverse rotational flow, the added flocculating agent solution is rapidly and uniformly diffused into the whole sludge slurry, the purpose of instantaneous mixing is achieved, the mixing efficiency is as high as 90-96%, the flocculating agent consumption can be saved by about 20-35%, the great significance is provided for improving the reaction efficiency and saving energy, and further the sludge and the flocculating agent solution can be fully mixed and reacted and then output into the product output tank, the reaction efficiency of the sludge and the flocculating agent solution can be greatly improved, and good economic benefits are created.
Preferably, a flowmeter for detecting the actual output flow is arranged on a pipeline connecting the sludge storage tank and the spherical mixing tee joint and a pipeline connecting the flocculant storage tank and the spherical mixing tee joint.
Preferably, the intelligent control system also comprises a control cabinet, wherein a programmable logic controller and a data collector are arranged in the control cabinet, and the data collector is in communication connection with the programmable logic controller; the viscosity sensor, the turbidity sensor and the flowmeter are all in communication connection with the data acquisition unit; and the metering pump and the electric valve are in communication connection with the programmable logic controller.
Preferably, silt storage jar, flocculating agent agitator tank, flocculating agent storage jar and product output tank all include jar body and cover, the connection can be dismantled to cover and jar body.
Preferably, the cover of silt storage jar, flocculating agent agitator tank, flocculating agent storage jar and product output tank on all be equipped with the level gauge that is used for detecting the liquid level, level gauge and data collection station communication connection.
Preferably, a stirrer is arranged in each of the flocculant stirring tank and the sludge storage tank. The purpose of arranging a stirrer in the sludge storage tank is to keep the slurry in a uniform suspension state, prevent the sedimentation of slurry particles and ensure the output of uniform dredged sludge slurry; the purpose of arranging the stirrer in the flocculating agent stirring tank is to fully mix flocculating agent powder and water for reaction and obtain stable flocculating solution.
Preferably, a sludge discharge hole is formed in the position, located at one tenth of the total tank body height of the bottom, of the side wall of the sludge storage tank; a discharge port of the flocculant stirring tank is formed in the position, located at one tenth of the total tank body height of the bottom, on the side wall of the flocculant stirring tank; a flocculant storage tank feeding hole is formed in the position, located at the height of one tenth of the total tank body at the bottom, of the side wall of the flocculant storage tank, and a flocculant storage tank discharging hole is formed in the other side position, located at the height of one tenth of the total tank body at the bottom, of the side wall of the flocculant storage tank; a product feeding hole is formed in the side wall of the product output tank at the position which is positioned at the top and is ten times the height of the total tank body; all be carved with the screw thread that is used for connecting tube on flocculating agent agitator tank discharge gate, flocculating agent storage jar feed inlet, flocculating agent storage jar discharge gate and the product feed inlet.
Compared with the prior art, the utility model has the following characteristics and beneficial effect:
(1) adopt the utility model relates to a sea filling solidified soil composition production parameter model test equipment can simulate out the size of each part of actual sea filling solidified soil composition production facility and the optimum flow of silt and flocculating agent solution according to the silt and the different types of flocculating agent of different compositions, and then formulate the sea filling solidified soil composition that satisfies the sea filling requirement, the quality is optimal, automatic control and automatic data acquisition have been adopted to the overall process, can use manpower sparingly in actual engineering in a large number, the human cost of sea filling engineering has been saved.
(2) Adopt the utility model relates to an adopted static mixer to mix flocculating agent solution and silt among model test equipment and the model test method, reaction efficiency is very high, can save the flocculating agent, saves the cost.
(3) The tank body and the pipeline in the whole set of model test equipment are transparent, so that the whole test process can be visually observed, and the feasibility of the equipment for actual sea-filling engineering after the scale is enlarged is conveniently verified.
Drawings
FIG. 1 is a schematic diagram of a production parameter model test apparatus for a reclamation firming soil composition;
FIG. 2 is a schematic view of the structure of a sludge storage tank;
FIG. 3 is a schematic diagram of the configuration of a flocculant mixing tank;
FIG. 4 is a schematic diagram of the flocculant storage tank;
fig. 5 is a schematic diagram of the structure of the product output tank.
In the figure: 1-a sludge storage tank, 2-a stainless steel bracket, 3-an electric valve, 4-a metering pump, 5-a flow meter, 6-a sludge discharge port, 7-a flocculant stirring tank, 8-a liquid level meter, 9-a stirrer, 10-a tank cover, 11-a flocculant stirring tank discharge port, 12-a flocculant storage tank feed port, 13-a flocculant storage tank, 14-a flocculant storage tank discharge port, 15-a spherical mixing tee joint, 16-a static mixer, 17-a viscosity sensor, 18-a turbidity sensor, 19-a product feed port, 20-a pipeline, 21-a data acquisition device, 22-a programmable logic controller, 23-a control cabinet and 24-a product output tank.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, and the following examples are illustrative of the present invention and are not limited to the following examples.
Previous studies by the applicant show that: the waste dredged sludge in the dredging engineering is utilized, and the flocculating agent which is widely accepted and used in the field of drinking water treatment is adopted, so that the soil particles and water can be quickly separated due to the strong capability of adsorbing and precipitating the soil particles. According to related researches, the commonly used polymeric flocculant solution has a good rapid water-soil separation effect after being mixed with sludge with high water content and sludge soft clay, and the optimal mixing ratio of the flocculant powder and the dredged sludge can be obtained through experiments, so that the novel sea-filling solidified soil composition can be obtained. The sea-filling solidified soil composition comprises 90.0-99.9% of sludge and 0.1-1% of flocculant solution by mass, and the dilution ratio of the flocculant solution is 0.1-5%.
The flocculant solution selected in the embodiment is polyacrylamide flocculant solution, the sludge is dredging sludge, the mass percent of the polyacrylamide flocculant solution is 0.3%, the mass percent of the dredging sludge is 99.7%, and the dilution ratio of the flocculant in water is 1-2% when the polyacrylamide flocculant (PAM) solution is prepared.
Because the dredged sludge in various regions has complex components and different properties, and the types and the models of the flocculating agents are numerous, different flocculating agent types and models are required to be configured for the dredged sludge in various regions; however, in the actual construction process, the problems of difficulty in selecting the type and model of the flocculating agent, difficulty in selecting the optimal amount, and the like are faced. Therefore, the applicant proposes to adopt different sizes of production equipment and output flow rates of sludge and flocculant solution aiming at different components of sludge and types and models of flocculants so as to obtain the solidified soil composition with the best effect.
In order to obtain the size and pipe diameter of each part of the production equipment, the output flow of the sludge and the flocculant solution and further obtain the solidified soil composition with the best effect, the embodiment relates to production parameter model test equipment for obtaining the sea-filling solidified soil composition. Referring to fig. 1, the production parameter model test equipment for the sea-filling solidified soil composition comprises a sludge storage tank 1, a flocculant stirring tank 7, a flocculant storage tank 13, a spherical mixing tee 15, a static mixer 16 and a product output tank 24, wherein the sludge storage tank 1, the flocculant stirring tank 7, the flocculant storage tank 13 and the product output tank 24 are all arranged on a stainless steel bracket 2.
Referring to the attached drawing 3, the flocculant stirring tank 7 comprises a tank body and a tank cover 10, wherein the tank cover 10 is detachably connected with the tank body, a flocculant stirring tank discharge port 11 is formed in the side wall of the flocculant stirring tank 7 and is positioned at the position of one tenth of the total tank body height of the bottom, a stirrer 9 is arranged in each flocculant stirring tank 7, and a liquid level meter 8 for detecting the liquid level in the flocculant stirring tank 7 is arranged on each flocculant stirring tank 7; referring to the attached drawing 4, the flocculating agent storage tank 13 comprises a tank body and a tank cover 10, the tank cover 10 is detachably connected with the tank body, a flocculating agent storage tank feeding port 12 is formed in the position, located at the bottom tenth of the total tank body height, on the side wall of the flocculating agent storage tank 13, a flocculating agent storage tank discharging port 14 is formed in the position, located at the other side of the bottom tenth of the total tank body height, on the side wall of the flocculating agent storage tank, and a liquid level meter 8 used for detecting the liquid level in the flocculating agent storage tank.
Referring to the attached figure 2, the sludge storage tank 1 comprises a tank body and a tank cover 10, the tank cover 10 is detachably connected with the tank body, a stirrer 9 and a liquid level meter 8 for detecting the liquid level of sludge in the sludge storage tank 1 are arranged in the sludge storage tank 1, and a sludge discharge hole 6 is formed in the side wall of the sludge storage tank 1 and is positioned at the bottom of one tenth of the total tank body height; referring to fig. 1, the output end of the sludge storage tank 1 and the output end of the flocculant storage tank 13 are respectively connected to two interfaces of the spherical mixing tee 15 through pipelines 20.
Referring to fig. 1 and 5, the product output tank 4 comprises a tank body and a tank cover 10, the tank cover 10 is detachably connected with the tank body, a product feed port 19 is formed in the side wall of the product output tank 24 and is positioned at a position which is a tenth of the total tank body height of the top, the other port of the spherical mixing tee 15 is communicated with one end of a static mixer 16, and the other end of the static mixer 16 is communicated with the input end of the product output tank 19 through a pipeline 20; the product output tank 24 is provided with a viscosity sensor 17 for detecting the viscosity of the composition, a turbidity sensor 18 for detecting the turbidity of the composition and a liquid level meter 8 for detecting the liquid level of the product in the product output tank 24.
Referring to the attached figure 1, electric valves are arranged on the pipelines 20, and metering pumps for controlling output flow are arranged on the pipelines connecting the flocculant stirring tank 7 and the flocculant storage tank 13, the pipelines connecting the sludge storage tank 1 and the spherical mixing tee 15, and the pipelines connecting the flocculant storage tank 13 and the spherical mixing tee 15; and a flowmeter 5 for detecting the actual output flow is arranged on the pipeline connecting the sludge storage tank 1 and the spherical mixing tee 15 and on the pipeline 15 connecting the flocculating agent storage tank 13 and the spherical mixing tee.
Referring to the attached figure 1, the model test equipment for sea reclamation material composition based on flocculation technology further comprises a control cabinet 23, a programmable logic controller 22 and a data collector 21 are arranged in the control cabinet 23, and the data collector 21 is in communication connection with the programmable logic controller 22; the viscosity sensor 17, the turbidity sensor 18, the flowmeter 5 and the liquid level meter 8 are all in communication connection with the data acquisition unit; the metering pump 4 and the electric valve 3 are both in communication connection with the programmable logic controller 22.
The test method of the production parameter model test equipment adopting the sea-filling solidified soil composition comprises the following steps:
s1, according to optimal proportioning parameters of a flocculating agent solution and sludge determined by a small-scale experiment at a geotechnical engineering laboratory level, preliminarily calculating and setting the sizes of a sludge storage tank, a flocculating agent stirring tank, a flocculating agent storage tank and a product output tank, selecting the pipe diameter of a pipeline according to the sizes, and preliminarily calculating and setting the output flow rates of the sludge and the flocculating agent solution; the method comprises the following steps:
1) calculating the size of each tank body:
assuming that the scale of the model test is 1:20, the density of water is 1000kg/m3The dry density of the soil particles is 2600kg/m3The actual water content of the slurry is about 100% to 400%, and if the water content of the slurry is 400%, the tank size calculation process is as follows:
in the actual engineering construction, the arrangement and the size of the sludge storage tank are determined by various factors such as total filling amount, machine quantity, construction period and the like, and the design size of the sludge storage tank in certain sea filling engineering is assumed to be 6m in diameter and 12m in height in the model test, so that the design total storage volume is 250m3Calculating according to the similar scale of the model test to obtain that the size of the tank body of the sludge storage tank in the model test is 0.3m in diameter and 0.6m in height, and the storage volume of sludge slurry is 0.036m3m3Then, 0.036m3m3The total mass of the slurry is:
in this test, assuming that the dilution ratio of the flocculant to water is 0.5% and the dosage of the flocculant per kilogram of soil (dry weight) is 2g, the maximum dosage of the total flocculant in a single test is as follows:
mf＝22.65×2＝45.3g；
taking 50g of the whole flocculant solution, wherein the dilution ratio is 0.5 percent, and the total mass of the flocculant solution is as follows:
mfl＝(100+0.5)×mf＝(100+0.5)×45.3＝4552.65g＝4.552kg；
taking the total weight of the flocculation liquid after finishing as 5 kg;
the flocculant is thrown and need to stir half an hour after the material and can be fully mixed with water and become flocculant solution and export and silt mud mixing reaction, for guaranteeing the continuous output of flocculant solution, the output device of flocculant agitator tank and the linkage of flocculation liquid storage jar two-stage has been set up, flocculant agitator tank stirring time is half an hour, export the flocculation liquid storage jar after stirring well, export flocculant solution and mud reaction from flocculant storage jar again, the volume of flocculant storage jar storage needs the reaction volume that exceeds half an hour, design flocculant storage jar memory space here and be an hour, avoid appearing the condition of flocculation liquid such as silt, guarantee promptly can be under construction continuously;
then theoretically, the flocculation liquid loading mass required by the stirring tank is as follows:
the corresponding flocculation liquid volume is:
a cylindrical reaction tank with a diameter of 0.15m and a height of 0.3m was used. The geometric similarity ratio is 1:20, the tank body on the construction site is designed to have a diameter of 3m and a height of 6m, and the designed storage volume is 20m3。
Theoretically, the mass of the flocculating liquid required to be loaded in the flocculating agent storage tank is 5kg, and the corresponding flocculating liquid volume is as follows:
taking a cylindrical storage tank with the diameter of 0.18m and the height of 0.36 m;
the total volume of the produced soil tank body to be stored is the sum of the two, and then the total storage volume is designed as follows:
Vp＝0.036+0.0025×2＝0.041m3；
taking a cylindrical storage tank with the diameter of 0.35m and the height of 0.7 m;
2) calculating and determining the size of a conveying pipeline
In the sludge dredging and hydraulic filling engineering, the principle of conveying sludge by a cutter suction dredger is that after negative pressure is generated by a centrifugal pump, slurry is sucked up and pressurized by a dredge pump, and then the slurry is conveyed to a designated area through a pipeline. The process of extracting the slurry in the model test is similar to the operation process of the cutter suction dredger;
the critical flow rate is a main factor influencing the resistance loss of the pipeline, and the main factors influencing the critical flow rate are slurry concentration, the particle composition and the shape of soil and the like. When the flow rate of the slurry is lower than the critical flow rate, precipitation occurs, and the pipeline has the risk of blockage; when the flow rate of the slurry is higher than the critical flow rate, a large amount of energy is consumed in the uniform suspension of the silt particles, and the lift consumption is increased. The closer the actual mud flow rate is to the critical flow rate, the lower its pipe resistance. When the average flow velocity of the pipeline section just exceeds the critical flow velocity, the pipeline resistance is minimum and the power is saved most. However, for long distance slurry pipeline transportation, the transportation flow rate must be higher than the critical flow rate.
As the physical properties such as the particle size, the water content and the like of the soil in the dredging hydraulic filling project are various, and the particle size of the soil used in the test is the same, the critical flow rate in pipeline transportation under the conditions of different concentrations in the prototype is calculated by adopting different slurry concentrations. For sludge and clay, the critical flow rate is calculated according to a pipeline slurry friction deduction formula of Durand, and the calculation formula is as follows:
in the formula: v. ofcCritical flow rate (m/s) of the slurry; c is the volume concentration (%) of soil particles; dsIs a soil particleParticle size (mm); d is the inner diameter (m) of the sludge discharge pipeline; rhosIs the density of soil particles (g/cm)3)；
The calculation and value of each parameter in the formula are as follows:
(1) volume concentration C is calculated (volume percent concentration at the same temperature and pressure, volume V of substance BBRatio to the volume V of the solution, referred to as the volume fraction of substance B): when the water content is 400%, the mass of the soil particles in 1kg of slurry is 0.2kg, and the volume of the soil particles is as follows:
the total volume of the slurry is:
the volume concentration C of the soil is as follows:
similar to the above calculation, the volume concentration C of the soil was 16.12% at a water content of 200%; when the water content is 100%, the volume concentration C of the soil is 27.75%;
(2) the particle size of the soil particles is as follows: the particle size of clay mud particles is less than 1mm, and the calculation conservatively assumes that the particle size of the clay particles is 1 mm;
(3) suppose that the inner diameter of the pipe is 300mm in practical engineering.
(4)ρsThe density of the soil particles is 2.6g/cm3。
The critical flow rate for pipeline transport is therefore calculated as follows:
(1) the critical flow rate at 400% water content was calculated as follows:
(2) the critical flow rate at 200% water content was calculated as follows:
(3) the critical flow rate at 100% water content was calculated as follows:
because the difference between the three is not great, the critical flow velocity of the pipeline in the prototype is 2.5m/s, in the actual engineering, the sludge conveying speed is slightly greater than the critical flow velocity, and the actual pipeline conveying speed is 3.0 m/s;
motion similarity means that the traces of any corresponding particles in the two flows of the prototype and the model are geometrically similar and that the time required for any corresponding particle to flow through the corresponding line segment is in the same proportion. Or the velocity fields (or acceleration fields) of the two flows are geometrically similar, the time scale is as follows according to the flow similarity principle in the model test
The speed scale is as follows:
the flow rate of the pipeline in the model test is as follows:
the bending radius of the slurry pipeline meets the design requirement, and the following relations exist between the flow and the section and the flow velocity of the pipeline:
the pipe diameter is calculated as follows:
calculating according to a safety factor of 1.5 times:
D＝1.5×0.98＝14.7mm
according to the nominal pipe size, a DN15 pipeline (namely 4 branch pipes made of inches) is selected as a conveying pipeline, the approximate inner diameter is 15mm, the outer diameter is 21.25mm, in order to explore the relation between the pipe diameter and the slurry conveying efficiency and the economical efficiency, 3 pipe diameters are reserved in the test as the variables of the model test, and the pipe diameters are respectively 4 branch pipes, 6 branch pipes and 1 inch pipes;
3) the calculation of the pump lift is an important basis for selecting the type of the pump, which is determined by the installation and operation conditions of a pipe network system, and after the maximum pump lift is calculated, the model of the metering pump is selected according to three parameters of the pump lift, the working pressure and the particle size to be pumped;
calculating the total head of a metering pump for pumping the slurry:
calculating the on-way pressure drop: for round tubes, pressure flow and on-way pressure drop were calculated using the Darcy-Welsbach equation:
wherein, λ is the on-way head loss coefficient (on-way resistance coefficient), L is the total length of the pipeline, D is the inner diameter of the pipeline, v is the mud flow rate, and g is the gravity acceleration.
The value of lambda is related to the Reynolds number, and the Reynolds number calculation formula is as follows:
wherein v, rho and mu are respectively the flow velocity, density and dynamic viscosity of the fluid, and d is the diameter of the circular tube. The values of the parameters are as follows:
(1) empirically, this mud kinematic viscosity value (mazewski mud viscometer test value) is assumed to be 50S (kinematic viscosity of 2000mPa · S (2Pa · S), i.e., 2000 centipoise).
(2) The density of the fluid is the maximum density value which can appear in the slurry, when the water content is minimum, the density of the fluid is maximum, the water content is minimum 100%, and according to the assumed value of the densities of the slurry and the water, the density of the slurry at the moment is 1445kg/m3；
The reynolds number is then calculated as:
the flow regime is divided into laminar, transitional and turbulent flow, generally known as the pipe flow ReThe slurry flow in the conveying pipeline belongs to laminar flow when the flow rate is less than 2100, turbulent flow when the flow rate is more than 4000 and transition flow state when the flow rate is 2100-4000. When R iseWhen the resistance coefficient lambda is less than 2100, the calculation process of the on-way resistance coefficient lambda is as follows:
the total length of the slurry pipeline is the sum of AB, BC, CD and DE sections, and the total length is 3.3 m;
the on-way pressure drop of the mud pipe is calculated as follows:
the local pressure drop (head loss in flow meters, valves, turns, etc.) in the pressure piping system is calculated as follows. The local resistance calculation is related to a local resistance coefficient zeta value, an electric ball valve is adopted as a valve, and zeta is 6.4 when the valve is fully opened; a standard elbow with the angle of 90 degrees is selected at the turning position, and zeta is 0.75; the flowmeter, ζ ═ 7. The calculation process is as follows:
the total pressure drop (head loss) is calculated as follows:
Ht＝Hf1+Hf2＝39.66+0.072＝39.73m
the total head of the slurry pump is calculated as follows:
h＝Ht+D＝Hf1+Hf2+D＝39.73+0.06＝39.79m
the maximum lift is 40 m.
P＝ρ×g×h＝1445×9.81×40＝567018mPa＝5.7bar
Calculating the total head of a metering pump for extracting the flocculating agent:
the type of the flocculant used in the model test is PAM (polyacrylamide), PAM solution is viscous, the higher the molecular weight is, the higher the solution viscosity of PAM is, and the PAM macromolecule is a long and thin chain-shaped body, so that the resistance to motion in the solution is large. Polyacrylamide is a linear high molecular polymer, and the product mainly comprises two forms of dry powder and colloid. The molecular weight can be divided into three types, namely low molecular weight (<100 ten thousand), medium molecular weight (200- > 400 ten thousand) and high molecular weight (>700 ten thousand). The maximum molecular weight of the flocculant is 1500 ten thousand, and the maximum viscosity of the solution is 3000 centipoises (namely 940 mPa.s);
the Reynolds number is calculated as follows:
generally considered as a pipe flow ReThe slurry flow in the conveying pipeline belongs to turbulent flow because the laminar flow state is less than 2100, the turbulent flow state is more than 4000 and the transitional flow state is 2100-4000. When R iseWhen the resistance coefficient lambda is less than 2100, the calculation process of the on-way resistance coefficient lambda is as follows:
the flocculant pipeline is GE, EF, FH, HI section, and the total length is 2.1 m.
The on-way pressure drop of the flocculant pipeline is calculated as follows:
the local pressure drop (head loss in flowmeters, valves, turns, etc.) in a pressure piping system is calculated as 10% to 30% of the on-way pressure drop in the pipe. The pipeline has short conveying distance and large turning, theoretically, the damage of a local water head is large, and therefore, the local pressure drop is calculated according to 10 percent of the on-way pressure drop in the pipeline, and the calculation is as follows:
Hn＝Hf×10％＝42.83×10％＝4.283m
the total pressure drop (head loss) is calculated as follows:
Ht＝Hf+Hn＝42.83+4.283＝47.12m
the total head of the flocculating liquid pump is calculated as follows:
h＝Ht+D＝47.12+0.03＝47.15m
taking the maximum lift as 50 m;
and (3) calculating the working pressure:
density x gravity coefficient x height (i.e. head) (1bar 0.1mPa 100000Pa)
P＝ρ×g×h＝1000×9.81×50＝490500mPa＝4.91bar
The two metering pumps for extracting the flocculating agent select the same model, so the model selection calculation is only carried out once, and a proper metering pump is selected according to the calculation;
4) selecting proper sensors and other spare parts and assembling the system
According to the actual test condition, selecting proper electric valves, liquid level meters, flow meters, viscosity sensors, turbidity sensors, control cabinets, programmable logic controllers, data collectors and other spare parts and assembling the whole set of test system;
s2, loading sludge, flocculant powder and water: loading a set amount of dredged sludge in a sludge storage tank, and adding a set amount of flocculant powder and water into a flocculant stirring tank according to the dilution ratio of a flocculant solution;
s3, preparing a flocculant solution: starting a flocculant stirring tank, stirring flocculant powder and water to form a flocculant solution, and conveying the flocculant solution to a flocculant storage tank for storage;
s4, mixing sludge and a flocculant solution: adjusting output quantities of the sludge and the flocculant solution through a metering pump, simultaneously outputting the sludge and the flocculant solution from a sludge storage tank and a flocculant storage tank, mixing and reacting the sludge and the flocculant solution in a static mixer and immediately outputting the mixture to a product output tank, and in the process, respectively measuring actual output quantities of the sludge and the flocculant solution in the mixing process of the sludge and the flocculant solution and judging whether the actual output quantities are the same as the set output quantity of the metering pump or not;
s5, monitoring and data acquisition in the whole process of the test: monitoring two physical quantities of turbidity and viscosity of a product in real time through a viscosity sensor and a turbidity sensor in a product output tank, collecting the physical quantities at intervals, observing the consolidation time, the consolidation progress and the state change of the product, and respectively monitoring the liquid level changes in a sludge storage tank, a flocculant stirring tank, a flocculant storage tank and a product output tank in an experiment;
s6, termination of the test: when the storage amount of the sludge in the sludge storage tank is insufficient, the whole test process is finished;
s7, repeating the steps S1-S6 for a plurality of times, judging the quality of the product according to the turbidity change and viscosity change of the product monitored in each test and the consolidation time, consolidation progress and state change of the obtained product by observation, selecting the best product, amplifying the size of each part and the pipe diameter of a pipeline corresponding to test equipment used for producing the best product according to proportion to form a set of production equipment, amplifying the output flow parameters of the sludge and the flocculating agent solution corresponding to the best product in the same proportion, and adopting the complete set of equipment with the size and the output flow parameters to produce the sea-filling solidified soil composition in batches.
The present invention has been described in detail with reference to the embodiments, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.
Claims (8)
1. A sea reclamation solidified soil composition production parameter model test device is characterized in that: the device comprises a sludge storage tank, a flocculating agent stirring tank, a flocculating agent storage tank, a spherical mixing tee joint and a product output tank; the output end of the flocculant stirring tank is communicated with the input end of the flocculant storage tank through a pipeline; the output end of the sludge storage tank and the output end of the flocculant storage tank are respectively connected with two interfaces of the spherical mixing tee joint through pipelines; the other connector of the spherical mixing tee joint is communicated with the input end of the product output tank through a pipeline; the product output tank is provided with a viscosity sensor for detecting the viscosity of the composition and a turbidity sensor for detecting the turbidity of the composition; the pipeline on all be equipped with electric valve, on the pipeline of connecting flocculating agent agitator tank and flocculating agent storage jar, on connecting the pipeline of silt storage jar and spherical mixing tee bend, all be equipped with the measuring pump that is used for controlling output flow on connecting the pipeline of flocculating agent storage jar and spherical mixing tee bend.
2. The apparatus for parametric model testing of reclamation firming compositions as recited in claim 1, wherein: still be equipped with static mixer between spherical mixing tee bend and the product output jar, another interface of spherical mixing tee bend communicates with static mixer's one end, static mixer's the other end passes through the input intercommunication of pipeline and product output jar.
3. The apparatus for parametric model testing of reclamation firming compositions as recited in claim 1, wherein: and flowmeters for detecting actual output flow are arranged on the pipeline connecting the sludge storage tank and the spherical mixing tee joint and the pipeline connecting the flocculating agent storage tank and the spherical mixing tee joint.
4. The apparatus for parametric model testing of reclamation firming compositions as recited in claim 1, wherein: the control cabinet is internally provided with a programmable logic controller and a data collector, and the data collector is in communication connection with the programmable logic controller; the viscosity sensor, the turbidity sensor and the flowmeter are all in communication connection with the data acquisition unit; and the metering pump and the electric valve are in communication connection with the programmable logic controller.
5. The apparatus for parametric model testing of reclamation firming compositions as recited in claim 4, wherein: silt storage jar, flocculating agent agitator tank, flocculating agent storage jar and product output jar all including a jar body and cover, the connection can be dismantled to cover and jar body.
6. The apparatus for parametric model testing of reclamation firming compositions as recited in claim 5, wherein: the cover of silt storage jar, flocculating agent agitator tank, flocculating agent storage jar and product output tank on all be equipped with the level gauge that is used for detecting the liquid level, level gauge and data collection station communication connection.
7. The apparatus for parametric model testing of reclamation firming compositions as recited in claim 1, wherein: the flocculating agent agitator tank with in the silt holding vessel all be equipped with the mixer.
8. The apparatus for parametric model testing of reclamation firming compositions as recited in claim 1, wherein: a sludge discharge hole is formed in the position, located at one tenth of the total tank body height of the bottom, of the side wall of the sludge storage tank; a discharge port of the flocculant stirring tank is formed in the position, located at one tenth of the total tank body height of the bottom, on the side wall of the flocculant stirring tank; a flocculant storage tank feeding hole is formed in the position, located at the height of one tenth of the total tank body at the bottom, of the side wall of the flocculant storage tank, and a flocculant storage tank discharging hole is formed in the other side position, located at the height of one tenth of the total tank body at the bottom, of the side wall of the flocculant storage tank; a product feeding hole is formed in the side wall of the product output tank at the position which is positioned at the top and is ten times the height of the total tank body; all be carved with the screw thread that is used for connecting tube on flocculating agent agitator tank discharge gate, flocculating agent storage jar feed inlet, flocculating agent storage jar discharge gate and the product feed inlet.
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