Assembly type nomadic flow state solidified soil production line based on vehicle-mounted unit

Abstract

The invention provides a nomadic flow state solidified soil production line based on a vehicle-mounted unit assembly type, and belongs to the technical field of urban construction. The assembly type nomadic flow state solidified soil production line based on the vehicle-mounted unit comprises a water storage tank, a slurry stirring machine, a curing agent pulping machine, a chute, a rotary screen, a secondary stirring machine, a horizontal slurry pump and a stirring transport vehicle, and the water storage tank is used for storing a water source and stably providing needed water for the slurry stirring machine in cooperation with a submersible pump; the slurry stirrer is used for combining water from the reservoir and fully stirring and mixing the soil material and the water to form slurry; the curing agent slurrying machine is used for realizing effective preparation and conveying of curing agent slurry, so that the curing agent slurry is subsequently mixed with slurry to realize a curing effect; the drum screen is used for realizing preliminary screening and shunting of materials; the secondary stirrer is used for fully mixing and reacting to finally form the flow-state solidified soil, and the problems that mobile flow-state solidification equipment is low in productivity, low in automation degree and unstable in product quality can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of urban construction, and in particular relates to a nomadic fluidized solidified soil production line based on a vehicle-mounted unit assembly. Background Art

[0002] Fluidized solidification technology is an important technical means in environmental geotechnical engineering and foundation treatment. It fully mixes the curing agent with soft soil, silt and other materials to form a solidified body with a certain strength, thereby achieving the purpose of improving the foundation, treating contaminated soil and solidifying dredged silt. With the in-depth advancement of urban construction and environmental governance, the application scenarios of fluidized solidification technology are becoming increasingly extensive, mainly including: soft soil foundation treatment, contaminated site remediation, river and lake silt treatment, industrial waste residue solidification and other fields. In the treatment of soft soil foundation, the use of fluidized solidification technology can significantly improve the bearing capacity of the foundation and reduce post-construction settlement; in the remediation of contaminated sites, the stabilization of pollutants such as heavy metals can be achieved through fluidized solidification; in the treatment of river and lake silt, fluidized solidification technology can convert dredged silt into usable engineering materials; in the treatment of industrial waste residue, fluidized solidification technology can reduce the environmental risks of waste residue.

[0003] At present, the fluidized solidification production line mainly adopts a fixed design, which requires the construction of permanent plants and supporting facilities. This model has many limitations in terms of equipment layout, raw material transportation and product delivery. First, the fixed production line occupies a large area, has a long construction period and high investment cost; second, the transportation distance of raw materials and products is long, which increases transportation costs and energy consumption; third, the equipment layout is not flexible enough, and it is difficult to make rapid adjustments according to project needs; finally, the product transportation radius is limited, which is difficult to meet the construction needs of large projects. Especially in the treatment of polluted sites and river and lake silt projects, due to the decentralized and temporary characteristics of the treatment objects, traditional fixed production lines are difficult to adapt to project needs, which often leads to problems such as low treatment efficiency and increased costs.

[0004] Although there are some mobile fluid solidification equipment, the mobile equipment in the existing technology generally has technical problems such as low production capacity, low degree of automation, and unstable product quality. The fundamental reason is that the existing mobile equipment fails to achieve effective coordination of processes such as material transportation, stirring and mixing, and product output, resulting in uneven material supply, insufficient mixing, and large fluctuations in product quality during the production process. Therefore, how to achieve coordinated control of each process and stability of product quality while ensuring the mobility of the equipment is a key technical problem that needs to be solved urgently. Summary of the invention

[0005] In view of this, the present invention provides a nomadic fluidized solidification soil production line based on a vehicle-mounted unit assembly, which can solve the technical problems of low production capacity, low degree of automation and unstable product quality of mobile fluidized solidification equipment.

[0006] The present invention is achieved in that:

[0007] The present invention provides a nomadic fluidized solidified soil production line based on a vehicle-mounted unit assembly, which includes: a water reservoir, a mud mixer, a curing agent pulping machine, a chute, a drum screen, a secondary mixer, a horizontal slurry pump and a mixing transport vehicle, wherein the water reservoir is connected to the water inlet of the mud mixer through a submersible pump, the feed inlet of the curing agent pulping machine is provided with a screw conveyor, the discharge port of the curing agent pulping machine is connected to the first feed inlet of the secondary mixer through a first horizontal slurry pump; the discharge port of the mud mixer is connected to the feed inlet of the chute The discharge end of the chute is connected to the feed end of the drum screen; the first discharge end of the drum screen is used to output stones with a particle size greater than 3 cm, and the second discharge end of the drum screen is connected to the second feed port of the secondary mixer; the discharge port of the secondary mixer is connected to the feed port of the mixer truck through a second horizontal slurry pump; the feed port of the mud mixer is also provided with a feed hopper for loading soil; the secondary mixer is provided with a stirring device inside, which is used to evenly stir the mud and the curing agent slurry to form a fluidized cured soil.

[0008] The technical effects of a nomadic fluidized solidified soil production line based on a vehicle-mounted unit assembly provided by the present invention are as follows: a water reservoir is used as a water source reserve, and a submersible pump is connected to the water inlet of a mud mixer, so that the required water can be stably provided to the mud mixer, ensuring that sufficient water is available for mixing in the subsequent mud preparation process; the feed port of the mud mixer is used to load soil material through a feed hopper, which makes it more convenient to receive soil material, and combines with the water from the water reservoir to fully mix the soil material and water into mud, thereby laying a basic material form for the subsequent generation of fluidized solidified soil; a screw conveyor is configured at the feed port of the curing agent slurry making machine, so that the materials required for making the curing agent slurry can be accurately and stably conveyed, and its discharge port is connected to the first feed port of the secondary mixer through a first horizontal slurry pump, so that the prepared curing agent slurry can be conveyed to the secondary mixer, thereby realizing effective preparation and conveying of the curing agent slurry, so that it can be subsequently mixed with the mud to realize the curing effect; a drum screen is provided for connecting the discharge port of the mud mixer with the feed end of the drum screen, The transitional function of material transportation is achieved, so that the mud produced by the mud mixer can smoothly enter the drum screen for the next screening process; the larger-sized stones in the material are screened and separated through the first discharge end of the secondary mixer to prevent these large stones from entering the subsequent process and affecting the quality of the fluidized solidified soil; the second discharge end of the secondary mixer is connected to the second feed port of the secondary mixer, so that the material that meets the particle size requirements can enter the secondary mixer for further processing, effectively performing the preliminary screening and diversion of the material; the secondary mixer is used to evenly mix the mud from the drum screen with the curing agent slurry delivered by the first horizontal slurry pump, so that the two are fully mixed and reacted, and finally form fluidized solidified soil; the first horizontal slurry pump is responsible for accurately delivering the curing agent slurry produced by the curing agent pulping machine to the secondary mixer, ensuring the stability of the pressure and flow of the curing agent slurry delivery; the second horizontal slurry pump is used to deliver the fluidized solidified soil mixed by the secondary mixer to the mixer truck, so that the final product can smoothly enter the transportation link.

[0009] On the basis of the above technical solution, the nomadic fluidized solidified soil production line based on the vehicle-mounted unit assembly of the present invention can also be improved as follows:

[0010] The inclination angle of the chute is 15-25 degrees, the inner wall of the chute is provided with an anti-stick coating, and baffles are provided on both sides of the chute.

[0011] Furthermore, the drum screen includes a screen drum body, a drive motor and a support frame. The inclination angle of the screen drum body is 3-8 degrees, the rotation speed of the drive motor is 15-25 revolutions per minute, and the inner wall of the screen drum body is provided with spiral guide ribs.

[0012] Furthermore, the secondary mixer includes a mixing barrel, a mixing shaft and a driving device. The mixing shaft is provided with a plurality of mixing blades. The mixing blades are made of a wear-resistant alloy. The rotation speed of the mixing shaft is 40-60 rpm.

[0013] Furthermore, the volume of the mud mixer is 8-12 cubic meters, and a high-speed shear stirring device is provided in the mud mixer, and the rotation speed of the stirring device is 80-120 revolutions per minute.

[0014] Furthermore, the conveying capacity of the first horizontal slurry pump and the second horizontal slurry pump are both 30-50 cubic meters per hour, and the impellers of the horizontal slurry pumps are made of wear-resistant rubber material.

[0015] Furthermore, the curing agent pulping machine includes a pulping barrel, a high-speed agitator and a feeding device. The volume of the pulping barrel is 2-4 cubic meters, the rotation speed of the high-speed agitator is 150-200 revolutions per minute, and the feeding device includes a metering device and an anti-blocking hopper.

[0016] Furthermore, the water reservoir is an assembled structure, including a plurality of detachable steel plates and sealing strips, a sedimentation area is provided at the bottom of the water reservoir, and a filter screen is provided at the water inlet of the water reservoir.

[0017] Furthermore, the production line also includes a central control system, which is electrically connected to the mud mixer, curing agent pulping machine, drum screen, secondary mixer and horizontal slurry pump, respectively, and is used to control the start and stop and operating parameters of each device.

[0018] Furthermore, a liquid level sensor is provided at the feed port of the mixing truck, an anti-stick coating is provided on the inner wall of the mixing barrel of the mixing truck, and the rotation speed of the mixing barrel is 8-15 rpm.

[0019] Compared with the prior art, the beneficial effect of the nomadic fluidized solidified soil production line based on vehicle-mounted unit assembly provided by the present invention is that the rapid installation and disassembly of the equipment is realized by adopting the vehicle-mounted unit assembly design. Each functional module adopts a standardized interface design, and the weight of a single module is controlled within 10 tons, which can be transported by an ordinary flatbed truck. The whole set of equipment only takes 8 hours from disassembly to installation, which greatly improves the mobility and adaptability of the equipment.

[0020] Secondly, the innovative design of the dual-shaft counter-rotating stirring system and multi-stage screening system significantly improves production efficiency and product quality stability, effectively solving the problem of impurity separation in raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0022] Figure 1 It is a schematic diagram of a nomadic fluidized soil solidification production line based on vehicle-mounted unit assembly;

[0023] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0024] 10. Water reservoir; 11. Mud mixer; 12. Curing agent pulping machine; 13. Chute; 14. Drum screen; 15. Secondary mixer; 16. Horizontal slurry pump; 17. Mixer transport truck. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0026] like Figure 1 As shown, it is a first embodiment of a nomadic fluidized solidified soil production line based on a vehicle-mounted unit assembly provided by the present invention. In this embodiment, it includes: a water reservoir 10, a mud mixer 11, a curing agent pulping machine 12, a chute 13, a drum screen 14, a secondary mixer 15, a horizontal slurry pump 16 and a mixer transport vehicle 17. The water reservoir 10 is connected to the water inlet of the mud mixer 11 through a submersible pump, the feed inlet of the curing agent pulping machine 12 is provided with a screw conveyor, and the discharge port of the curing agent pulping machine 12 is connected to the first feed inlet of the secondary mixer 15 through a first horizontal slurry pump; The discharge port of the mixer 11 is connected to the feed end of the chute 13, and the discharge end of the chute 13 is connected to the feed end of the drum screen 14; the first discharge end of the drum screen 14 is used to output stones with a particle size greater than 3 cm, and the second discharge end of the drum screen 14 is connected to the second feed port of the secondary mixer 15; the discharge port of the secondary mixer 15 is connected to the feed port of the mixer truck 17 through a second horizontal slurry pump; the feed port of the mud mixer 11 is also provided with a feed hopper for loading soil materials; a stirring device is provided inside the secondary mixer 15, which is used to evenly stir the mud and the curing agent slurry to form a fluidized cured soil.

[0027] Among them, in the above technical solution, the inclination angle of the chute 13 is 15-25 degrees, the inner wall of the chute 13 is provided with an anti-stick coating, and baffles are provided on both sides of the chute 13.

[0028] Furthermore, in the above technical solution, the drum screen 14 includes a screen body, a drive motor and a support frame. The inclination angle of the screen body is 3-8 degrees, the rotation speed of the drive motor is 15-25 rpm, and spiral guide ribs are arranged on the inner wall of the screen body.

[0029] Furthermore, in the above technical solution, the secondary mixer 15 includes a mixing barrel, a mixing shaft and a driving device. The mixing shaft is provided with a plurality of mixing blades, the mixing blades are made of wear-resistant alloy material, and the rotation speed of the mixing shaft is 40-60 rpm.

[0030] Furthermore, in the above technical solution, the volume of the mud mixer 11 is 8-12 cubic meters, and a high-speed shear stirring device is provided in the mud mixer 11, and the rotation speed of the stirring device is 80-120 revolutions per minute.

[0031] Furthermore, in the above technical solution, the conveying capacity of the first horizontal slurry pump and the second horizontal slurry pump are both 30-50 cubic meters per hour, and the impellers of the horizontal slurry pumps are made of wear-resistant rubber material.

[0032] Furthermore, in the above technical solution, the curing agent pulping machine 12 includes a pulping barrel, a high-speed agitator and a feeding device. The volume of the pulping barrel is 2-4 cubic meters, the speed of the high-speed agitator is 150-200 rpm, and the feeding device includes a metering device and an anti-blocking hopper.

[0033] Furthermore, in the above technical solution, the water reservoir 10 is an assembled structure, including a plurality of detachable steel plates and sealing strips, a sedimentation area is provided at the bottom of the water reservoir 10, and a filter screen is provided at the water inlet of the water reservoir 10.

[0034] Furthermore, in the above technical solution, the production line also includes a central control system, which is electrically connected to the mud mixer 11, the curing agent pulping machine 12, the drum screen 14, the secondary mixer 15 and the horizontal slurry pump 16, respectively, for controlling the start and stop and operating parameters of each device.

[0035] Furthermore, in the above technical solution, a liquid level sensor is provided at the feed port of the mixing truck 17, an anti-stick coating is provided on the inner wall of the mixing barrel of the mixing truck 17, and the rotation speed of the mixing barrel is 8-15 rpm.

[0036] Specifically, the principle of the present invention is: through the overall optimization design of system engineering, the coordinated control of processes such as material transportation, stirring and mixing, and product output is achieved. Specifically, by studying the rheological properties of fluidized solidified materials, it is found that its shear thinning property is closely related to the stirring effect. Therefore, the present invention adopts a dual-axis counter-rotating stirring system, the main shaft is responsible for macroscopic stirring, and the auxiliary shaft provides shearing action. The speed ratio of the two is optimized to 1.67:1. This ratio is based on a comprehensive consideration of the Reynolds number and the Froude number. It was found through calculation that at this speed ratio, the material forms an ideal eddy current field in the stirring area, which not only ensures the uniformity of stirring, but also avoids energy loss.

[0037] The present invention adopts a nomadic fluidized solidified soil production line based on vehicle-mounted unit assembly, adopts an overall modular design concept, and realizes the rapid installation and disassembly of the equipment by organically combining the water storage tank module, mud preparation module, curing agent preparation module, screening module, secondary mixing module and conveying module. The whole system is compactly arranged, and the floor area is controlled within the range of 200-300 square meters. The modules are connected by standardized quick-release joints, which not only ensures the convenience of installation, but also ensures the reliability of operation. The water storage tank adopts an assembled steel plate structure design, which is assembled by bolting 8mm thick steel plates. Rubber sealing strips are set at the joints to ensure water tightness. The size of the tank body is 6m long × 4m wide × 2m high, with an effective volume of about 40 cubic meters. A 15° slope is set at the bottom to facilitate sediment collection. A stainless steel filter with a φ10mm aperture is installed at the water inlet to intercept large particles of debris. At the same time, two submersible pumps with a power of 5.5kW are equipped to achieve reliable operation of one for use and one for backup.

[0038] In the mud preparation module, the mud mixer adopts a vertical double-shaft structure design, the mixing barrel volume is 10 cubic meters, and the mixing device consists of a main shaft and an auxiliary shaft. The main shaft is equipped with a blade stirrer with a speed of 100rpm and a power of 22kW, and the auxiliary shaft is equipped with a spiral stirrer with a speed of 60rpm and a power of 11kW. This double-shaft design greatly improves the mixing efficiency and uniformity; the feed hopper volume is 2 cubic meters, and a vibrator is set at the bottom to prevent the occurrence of material bridging. The inner wall of the mixing barrel adopts a wear-resistant lining with a service life of not less than 2000 hours. At the same time, the curing agent preparation module adopts a vertical single-shaft structure, the slurry barrel volume is 3 cubic meters, the stirrer adopts a high-speed shear design, the speed is 180rpm, the power is 15kW, the matching screw conveyor is 3m long, the conveying capacity is 5t / h, and the power is 3kW. The metering device adopts a weightless design with an accuracy control within ±1%. The anti-blocking hopper adopts a conical structure and the inner wall is treated with polytetrafluoroethylene coating, which effectively prevents the adhesion and blockage of the material.

[0039] The screening system adopts a drum screen with a single-drum structure design. The diameter of the screen drum is 1.5m and the length is 3m. It maintains an inclination angle of 5° during operation. The screen is made of polyurethane material with a uniform aperture of 30mm. The drive system adopts a variable frequency motor with a power of 5.5kW. The speed can be continuously adjusted within the range of 15-25rpm. The support frame adopts a channel steel welding structure and is equipped with a vibration reduction device. The inner wall of the screen drum is equipped with a spiral guide rib with a guide angle of 15°. This design not only ensures the screening effect, but also improves the screening efficiency. The secondary mixing module adopts a horizontal structure design, the mixing barrel has a volume of 5 cubic meters, the mixing shaft adopts a double-axis counter-rotating structure, the speed is 50rpm, and it is equipped with two motors with a power of 18.5kW. The mixing blades are made of wear-resistant alloy material with a design service life of not less than 3000 hours. The inner wall of the barrel also adopts a wear-resistant lining plate, which can work normally in the temperature range of -20℃ to 60℃.

[0040] The conveying system uses a single-stage single-suction horizontal slurry pump with a rated flow of 40m 3 / h, head 40m, power 30kW, pump body is made of high chromium alloy, impeller is made of wear-resistant rubber, pipeline is made of DN150 steel pipe, wall thickness 6mm, and matched with quick-release connectors. This design not only ensures the system's conveying capacity, but also facilitates on-site installation and maintenance. The workflow of the entire system is reasonably designed, forming a complete control chain from raw material preparation to product output, and realizing coordinated operation of each link through the central control system. During the system installation phase, you first need to select a load-bearing capacity of not less than 15t / m 2 We first leveled the site, installed each module according to the overall layout, connected the pipelines and electrical lines, and then conducted system debugging to ensure that each device was operating normally.

[0041] During the production process, the system achieves stable production through a series of automated control methods: first, the water level and water inflow of the reservoir are automatically controlled through the liquid level sensor and flow meter; second, the quantitative supply of soil and curing agent is achieved through the weight sensor and frequency converter; third, the coordinated operation of the mixing equipment and the conveying equipment is achieved through the speed sensor and pressure sensor; and finally, the real-time monitoring of product quality is achieved through the online detection equipment. The system focuses on controlling the following key parameters during operation: mud concentration is controlled at 1.5-1.8g / cm 3 The curing agent slurry concentration is kept within the range of 1.2-1.4 g / cm 3 The screening efficiency is not less than 95%, and the mixing uniformity is above 90%. At the same time, reasonable quality control measures are taken to ensure that the various technical indicators of the product meet the requirements, among which the 28-day compressive strength of the fluidized solidified soil is not less than 1.0MPa, the fluidity is maintained within the range of 180-220mm, and the initial setting time is not less than 4 hours.

[0042] This implementation method has also been carefully designed in terms of operation and maintenance: the filter screen, chute, drum screen, mixing barrel and conveying pipeline of the water storage tank are cleaned every shift, and the operation of each motor, bearing temperature, lubrication condition, sealing parts and transmission parts are checked; each lubricant is replaced every week, the tension of the transmission chain is checked, the shaft seal parts are cleaned and the electrical components are checked; the wear of wear-resistant parts, the state of seals, the opening and closing of valves and the accuracy of instruments are checked every month. In terms of safety measures, in addition to requiring operators to undergo training and wear necessary labor protection supplies, protective covers are set on each transmission part, emergency stop buttons are set, necessary fire-fighting facilities are equipped, and waterproof measures are taken for electrical equipment. In terms of environmental protection, dust pollution is controlled by setting up spray devices in hoppers, sealing covers at conveying points, and regular watering on the ground, and noise pollution is controlled by setting up soundproof covers and using vibration reduction facilities.

[0043] By adding admixtures, it can be used for greening planting soil, solidification and transportation, temporary road filling, shallow foundation backfill, road base, road subbase, in-situ composite foundation treatment and other scenarios. In practical applications, this implementation method can achieve continuous and stable production of fluidized solidified soil, meet the requirements of engineering construction, ensure product quality through reasonable operation and management, fully meet the requirements of construction progress, and have significant economic and social benefits.

[0044] Furthermore, in order to better promote the coordination of equipment between the entire production line, the production line is optimized and limited by parameter optimization equations, including pumping power equation, stirring power equation, flow balance equation, drum screening equation, stirring speed equation, capacity matching equation, material movement equation, energy consumption equation, chute conveying equation, and pumping pressure equation:

[0045] The pumping power equation is used to determine the motor power of the horizontal slurry pump. The inputs include the conveying distance, pipeline resistance coefficient, material density, and flow rate. The output is the motor power required for the horizontal slurry pump. The stirring power equation is used to determine the motor power of the stirring equipment. The inputs include material viscosity, stirring speed, and stirring barrel volume. The outputs are the motor power required for the mud mixer and the motor power required for the secondary mixer. The flow balance equation is used to determine the processing capacity of each equipment. The inputs include the mud pump flow rate and the curing agent pump flow rate. The output is the processing capacity required for the secondary mixer. The drum screening equation is used to determine the structural parameters of the drum screen. The inputs include the rotation speed, inclination angle, and material moisture content. The output is the mesh aperture and screen drum length of the drum screen. The stirring speed equation is used to determine the structural dimensions of the agitator. The inputs include the rotation speed, inclination angle, and material moisture content. The output is the mesh aperture and screen drum length of the drum screen. It includes material density and mixing barrel diameter, and the output is the mixing blade diameter and the number of blades; the capacity matching equation is used to determine the rated capacity of each equipment, and the input includes the mud mixer processing capacity and the drum screen processing capacity, and the output is the design capacity of the production line; the material migration equation is used to determine the conveying pipeline parameters, and the input includes material density and flow rate, and the output is the conveying pipeline diameter; the energy consumption equation is used to determine the power configuration of each equipment, and the input includes the design capacity and material density, and the output is the total installed power of the production line; the chute conveying equation is used to determine the structural parameters of the chute, and the input includes the chute inclination and material moisture content, and the output is the chute width and length; the pumping pressure equation is used to determine the pressure level of the pump, and the input includes the pipeline length, elevation difference, and local resistance coefficient, and the output is the rated pressure of the pump.

[0046] 1. Pumping power equation:

[0047] The pumping power equation is specifically expressed as follows:

[0048]

[0049] Where, P p is the motor power required for the horizontal slurry pump (kW); Q is the flow rate (m 3 / s); ρ is the material density (kg / m 3 ); g is the acceleration due to gravity (9.81 m / s 2 );H f H is the pipeline friction loss head (m); s is the static head (m); η p is the pump efficiency (0.6-0.8); α1 is the empirical coefficient (0.1-0.3); ε1 is the error term.

[0050] The parameter acquisition method is:

[0051] H f Calculated by Darcy-Weisbach formula:

[0052] Where λ is the resistance coefficient along the pipeline; L is the length of the pipeline (m); D is the diameter of the pipeline (m); and v is the flow velocity (m / s).

[0053] 2. Stirring power equation:

[0054] The stirring power equation is specifically expressed as follows:

[0055] P m =K p ρn 3 d 5 +μn 2 d 4 +β1ρgnd 3 +ε2;

[0056] Where, P m K is the power required by the agitator (kW); p is the power number (related to the type of stirring propeller, with a value of 3-7); n is the rotation speed (r / s); d is the diameter of the stirring propeller (m); μ is the viscosity of the material (Pa·s); β1 is the correction coefficient (0.2-0.4); ε2 is the error term.

[0057] 3. Flow balance equation:

[0058] The flow balance equation is specifically expressed as follows:

[0059] Q t =Q s (1+r)+Q a +ε3;

[0060] In the formula, Q t Secondary mixer processing flow (m 3 / h); Q s is the mud pump flow rate (m 3 / h); r is the curing agent addition ratio (0.1-0.3); Q a is the amount of air added (m 3 / h); ε3 is the error term.

[0061] 4. Drum screening equation:

[0062] The drum screening equation is specifically expressed as follows:

[0063]

[0064] Where, η sis the screening efficiency; k1 is the screening coefficient (0.5-1.5); ω is the angular velocity of the screen drum (rad / s); t is the material residence time (s); θ is the inclination angle of the screen drum (rad); k2 is the moisture content influence coefficient (0.1-0.3); w is the moisture content of the material; ε4 is the error term.

[0065] 5. Stirring speed equation:

[0066] The stirring speed equation is specifically expressed as follows:

[0067]

[0068] Where n opt is the optimal stirring speed (r / s); D is the diameter of the stirring barrel (m); ρ s is the solid phase density (kg / m 3 ); ρ is the slurry density (kg / m 3 ), d is the diameter of the stirring paddle (m), and ε5 is the error term.

[0069] 6. Capacity matching equation:

[0070] The capacity matching equation is specifically expressed as follows:

[0071] Q design =min(Q1n1,Q2n2,Q3n3)+ε6;

[0072] In the formula, Q design Design production capacity for the production line (m 3 / h); Q1, Q2, Q3 are the rated processing capacity of mud mixer, drum screen, and secondary mixer respectively (m 3 / h); η1, η2, η3 are the efficiency coefficients of each device (0.8-0.95); ε6 is the error term.

[0073] 7. Material movement equation:

[0074] The material transport equation is specifically expressed as follows:

[0075]

[0076] Where, D opt is the optimal pipe diameter (m); Q is the design flow rate (m 3 / s); λ is the pipeline resistance coefficient; L is the transportation distance (m); Δh allow is the allowable pressure loss (m); ε7 is the error term.

[0077] 8. Energy consumption equation:

[0078] The energy consumption equation is specifically expressed as follows:

[0079]

[0080] Where, P total is the total installed power (kW); k i is the simultaneous use coefficient (0.6-0.9); P i is the rated power of each device (kW); η i is the load factor (0.7-0.9); P aux is the auxiliary equipment power (kW); ε8 is the error term.

[0081] 9. Chute conveying equation:

[0082] The chute conveying equation is specifically expressed as follows:

[0083]

[0084] In the formula, v s is the chute conveying speed (m / s); α is the chute inclination (rad); L is the chute length (m); f is the friction coefficient; k3 is the moisture content influence coefficient (0.2-0.4); w is the material moisture content; ε9 is the error term.

[0085] 10. Pumping pressure equation:

[0086] The pumping pressure equation is specifically expressed as follows:

[0087]

[0088] Where, P pump is the rated pressure of the pump (Pa); H s is the static head (m); ∑ξ is the sum of local loss coefficients; v is the flow velocity (m / s); λ is the pipeline resistance coefficient; L is the pipeline length (m); D is the pipeline diameter (m); ε 10 is the error term.

[0089] Equation principle explanation:

[0090] 1. The pumping power equation takes into account the basic power requirement for fluid delivery (flow × pressure), pump efficiency losses, and additional kinetic energy losses. The quadratic term is used because kinetic energy is proportional to the square of velocity.

[0091] 2. The stirring power equation is based on the three main energy consumption mechanisms of the stirring process: inertial force power consumption (with n 3 Proportional to n 2 proportional to n) and gravitational power consumption (proportional to n).

[0092] 3. The flow balance equation follows the law of conservation of mass and takes into account the effects of curing agent addition and air incorporation on the total flow.

[0093] 4. The drum screening equation is based on probability statistics theory. It uses an exponential function to describe the probability of materials passing through the sieve holes and takes into account the influence of moisture content.

[0094] 5. The stirring speed equation is based on a comprehensive consideration of the Froude criterion and the Reynolds criterion, and the power of 0.25 comes from dimensional analysis.

[0095] 6. The capacity matching equation adopts the minimum value principle, reflecting the barrel effect of each link in the production line.

[0096] 7. The material transfer equation is based on the concept of economic pipe diameter and takes into account the balance between investment cost and operating cost.

[0097] 8. The energy consumption equation takes into account the equipment load characteristics and simultaneous use characteristics, and adopts the linear superposition principle.

[0098] 9. The chute conveying equation is based on the kinematic principle of materials on an inclined plane and takes into account the process of converting gravitational potential energy into kinetic energy.

[0099] 10. The pumping pressure equation takes into account static pressure, dynamic pressure loss and friction loss, based on the Bernoulli equation. The following is a detailed description of the derivation process of each equation:

[0100] 1. Derivation process of pumping power equation:

[0101] Step 1: Establish the basic power equation:

[0102]

[0103] Where Q is flow rate, P is pressure, η p is the pump efficiency.

[0104] Step 2: Expand the pressure item:

[0105] P=ρg(H f +H s );

[0106] Among them, H f is the pipeline friction loss head, H s To be quiet and lift up the journey.

[0107] Step 3: Consider kinetic energy loss:

[0108] Introducing the quadratic term α1Q 2 ρ represents the kinetic energy loss, and the coefficient α1 is obtained through experiments.

[0109] Step 4: Add the error term to get the final equation:

[0110]

[0111] Additional information on parameter sources:

[0112] α1 was obtained by the following experiment:

[0113] Step 1: Measure actual power consumption at different flow rates;

[0114] Step 2: Subtract the theoretical power consumption to get the kinetic energy loss;

[0115] Step 3: Obtain the α1 value by least squares fitting.

[0116] 2. Derivation process of stirring power equation:

[0117] Step 1: Analyze the three types of energy consumption during the mixing process:

[0118] 1) Inertial force power consumption: P1 = K1ρn 3 d 5 ;

[0119] 2) Viscous force power consumption: P2 = K2μn 2 d 4 ;

[0120] 3) Gravity power consumption: P3 = K3ρgnd 3 .

[0121] Step 2: Merge coefficients:

[0122] K p =K1;β1=K3.

[0123] Step 3: Get the final equation:

[0124] P m =K p ρn 3 d 5 +μn 2 d 4 +β1ρgnd 3 +ε2.

[0125] Additional information on parameter sources:

[0126] K p Obtained through:

[0127] Step 1: Measure the stirring power at different speeds;

[0128] Step 2: Determine the power number by dimensionless analysis.

[0129] 3. Derivation process of flow balance equation:

[0130] Step 1: List the material conservation equation:

[0131] Q t =Q s +Q f +Q a ;

[0132] Where Q f is the curing agent flow rate.

[0133] Step 2: Establish the ratio of curing agent to mud:

[0134] Q f =rQ s ;

[0135] Where r is the curing agent addition ratio.

[0136] Step 3: Get the final equation:

[0137] Q t =Q s (1+r)+Q a +ε3.

[0138] 4. Derivation process of drum screening equation:

[0139] Step 1: Establish a basic screening efficiency model:

[0140]

[0141] Step 2: Consider the influence of moisture content:

[0142] Introduce the correction term (1-k2w).

[0143] Step 3: Get the final equation:

[0144]

[0145] Additional information on parameter sources:

[0146] k1, k2 are obtained by the following test:

[0147] Step 1: Measure the screening efficiency at different speeds and inclination angles;

[0148] Step 2: Measure the screening efficiency at different moisture contents;

[0149] Step 3: Obtain coefficient values ​​through multiple regression analysis.

[0150] 5. Derivation process of stirring speed equation:

[0151] Step 1: Establish dimensionless criteria:

[0152] Froude number:

[0153] Reynolds number:

[0154] Step 2: Through dimensional analysis, we get:

[0155]

[0156] Step 3: Introduce geometric factor correction:

[0157]

[0158] 6. Derivation process of capacity matching equation:

[0159] Step 1: List the actual processing capabilities of each device:

[0160] Q i ′=Q i η i ,(i=1,2,3).

[0161] Step 2: According to the series characteristics of the production line:

[0162] Q design =min(Q1n1, Q2n2, Q3n3)+ε6.

[0163] 7. Derivation process of material transport equation:

[0164] Step 1: Establish the pressure loss equation:

[0165]

[0166] Step 2: Let Δh = Δh allow , solve for D:

[0167] 8. Derivation process of energy consumption equation:

[0168] Step 1: List the actual power of a single device:

[0169] P i ′=k i P i η i .

[0170] Step 2: Consider auxiliary equipment power:

[0171]

[0172] 9. Derivation process of chute conveying equation:

[0173] Step 1: Establish the material motion equation:

[0174] ma=mgsinα-fmgcosα.

[0175] Step 2: Solve the velocity equation:

[0176]

[0177] Step 3: Consider the influence of moisture content:

[0178]

[0179] 10. Derivation process of pumping pressure equation:

[0180] Step 1: List the total pressure loss:

[0181] Static pressure loss: P1 = ρgH s ;

[0182] Local losses:

[0183] Loss along the way:

[0184] Step 2: Get the final equation:

[0185]

[0186] The effects of these equations are:

[0187] 1. Various losses and influencing factors in actual production are taken into account;

[0188] 2. Contains measurable and adjustable parameters;

[0189] 3. Strong engineering practicality;

[0190] 4. The equations are interrelated, forming a complete parameter optimization system;

[0191] 5. The introduction of error terms improves the adaptability of the equation;

[0192] 6. System optimization can be achieved through parameter adjustment.

[0193] Example: Fluid solidification treatment in a beach restoration project.

[0194] This embodiment is aimed at a beach restoration project, with a total site area of ​​about 54,000 square meters, which is contaminated by heavy metals and organic matter. The amount of contaminated soil in the site is about 78,000 cubic meters, and the main pollutants include lead (average content 2450mg / kg), cadmium (average content 89mg / kg), and total petroleum hydrocarbons (average content 4500mg / kg). The soil moisture content is between 15% and 28%, the groundwater level of the site is buried at a depth of 3.2 meters, and the surface is relatively flat. Since the site is surrounded by residential areas, strict requirements are placed on dust and noise control. At the same time, the pollution distribution on the site is uneven, and zoning management is required. According to these characteristics, the nomadic fluidized solidification production line of the present invention is used for in-situ treatment. The specific implementation process is as follows.

[0195] 1. Equipment configuration and parameter setting

[0196] According to the project processing volume requirements and site conditions, the main equipment and parameters are shown in the following table.

[0197] Table 1 Main equipment configuration table:

[0198]

[0199]

[0200] The equipment operating parameters are optimized according to the characteristics of the contaminated soil and the treatment requirements. The main shaft speed of the mud mixer is set to 95rpm, and the secondary shaft speed is set to 58rpm; the stirring speed of the curing agent pulping machine is set to 175rpm; the drum screen speed is set to 18rpm, and the inclination angle is set to 5 degrees; the secondary mixer speed is set to 48rpm. The water-cement ratio is determined to be 0.45 through orthogonal tests, and the curing agent addition ratio is 12% cement, 8% fly ash, and 3% bentonite (all based on the dry weight of the contaminated soil).

[0201] 2. Equipment installation and debugging

[0202] The construction company selected a relatively flat area of ​​80m×40m in the site as the first installation location. The installation process was strictly carried out in accordance with the following steps. First, the site was leveled with a bulldozer and compacted with a roller. The bearing capacity of the foundation was measured to be 18t / m 2 . Secondly, complete the positioning and laying out according to the overall layout of the equipment. Then, use a 25-ton truck crane and a forklift to put the equipment in place. The installation time record of each module is shown in the following table.

[0203] Table 2 Equipment installation time record table:

[0204]

[0205] 3. System operation and parameter monitoring

[0206] During the operation of the system, an online monitoring system is used to monitor key parameters in real time. The main process parameters after the production line has been running for 72 hours are shown in the following table.

[0207] Table 3 Process parameter statistics:

[0208]

[0209]

[0210] 4. Product quality control

[0211] During the production process, samples were taken for testing every 4 hours, and a total of 180 sets of 28-day strength test specimens were produced. The results of the pollutant leaching test and strength test are shown in the following table.

[0212] Table 4 Product quality test results statistics:

[0213]

[0214]

[0215] 5. Equipment operation efficiency analysis

[0216] After the production line was in continuous operation for 30 days, the equipment operation efficiency was statistically analyzed. During this period, a total of 26,400 cubic meters of contaminated soil was processed, with an average daily processing volume of 880 cubic meters. The production line operation data is shown in the following table.

[0217] Table 5 Equipment operation efficiency statistics:

[0218]

[0219] 6. Environmental monitoring data

[0220] In order to assess the environmental impact of the production line, routine environmental monitoring was carried out during operation. The monitoring results are shown in the following table.

[0221] Table 6 Environmental monitoring data statistics:

[0222]

[0223]

[0224] 7. Cost accounting analysis

[0225] Cost accounting was carried out after the project had been running for 30 days, and the specific cost structure is shown in the following table.

[0226] Table 7 Cost composition analysis table:

[0227]

[0228] 8. Project effect evaluation

[0229] The treated site was systematically tested and evaluated. Among the 54 test points, the pollutant removal rate, solidified body strength and other indicators all met the design requirements. The specific test results are shown in the following table.

[0230] Table 8 Project effect evaluation table:

[0231]

[0232] 9.Maintain record statistics

[0233] The maintenance record statistics during equipment operation are shown in the following table.

[0234] Table 9 Maintenance record statistics:

[0235] Maintenance Project Maintenance frequency Replacement Parts Maintenance hours Mixing blade inspection Every 48 hours Replace 2 pieces 4 hours Bearing inspection Every 72 hours Replace 1 2 hours Seal replacement Every 96 hours Replace 4 3 hours Pipeline dredging Every 24 hours none 1 hour Screen cleaning Every 8 hours none 0.5 hours Motor inspection Every 24 hours none 1 hour

[0236] This example fully verifies the feasibility and superiority of the present invention. By adopting modular design, the equipment installation only takes 12 hours, which is much shorter than the construction period of traditional fixed equipment. The system operates stably, the product quality pass rate reaches 98%, and the processing cost is reduced by about 25% compared with the traditional process. In terms of environmental protection, the average dust emission concentration is only 0.42mg / m 3 , far below the emission standard limit. At the same time, the equipment is easy to maintain, with only two minor failures in 30 days of operation, and the equipment integrity rate is 97%. Practice has proved that the present invention not only solves the technical problems of low production capacity, low degree of automation and unstable product quality of mobile fluid solidification equipment, but also achieves remarkable results in economic and environmental benefits.

Claims

1. A nomadic fluidized soil solidification production line based on vehicle-mounted unit assembly, characterized in that: include: A water reservoir, a mud mixer, a curing agent pulping machine, a chute, a drum screen, a secondary mixer, a horizontal slurry pump and a mixer truck, wherein the water reservoir is connected to the water inlet of the mud mixer through a submersible pump, the feed inlet of the curing agent pulping machine is provided with a screw conveyor, the discharge port of the curing agent pulping machine is connected to the first feed inlet of the secondary mixer through a first horizontal slurry pump; the discharge port of the mud mixer is connected to the feed end of the chute, and the discharge end of the chute is connected to the feed end of the drum screen; the first discharge end of the drum screen is used to output stones with a particle size greater than 3 cm, and the second discharge end of the drum screen is connected to the second feed inlet of the secondary mixer; the discharge port of the secondary mixer is connected to the feed inlet of the mixer truck through a second horizontal slurry pump; the feed inlet of the mud mixer is also provided with a feed hopper for loading soil materials; a stirring device is provided inside the secondary mixer for evenly stirring the mud and the curing agent slurry to form fluidized solidified soil.

2. According to claim 1, a nomadic fluidized solidified soil production line based on vehicle-mounted unit assembly is characterized in that: The inclination angle of the chute is 15-25 degrees, the inner wall of the chute is provided with an anti-stick coating, and baffles are provided on both sides of the chute.

3. The nomadic fluidized soil solidification production line based on vehicle-mounted unit assembly according to claim 2 is characterized in that: The drum screen comprises a screen body, a drive motor and a support frame. The inclination angle of the screen body is 3-8 degrees, the rotation speed of the drive motor is 15-25 revolutions per minute, and the inner wall of the screen body is provided with spiral guide ribs.

4. The nomadic fluidized solidified soil production line based on vehicle-mounted unit assembly according to claim 3 is characterized in that: The secondary mixer comprises a mixing barrel, a mixing shaft and a driving device. The mixing shaft is provided with a plurality of mixing blades, the mixing blades are made of wear-resistant alloy material, and the rotation speed of the mixing shaft is 40-60 rpm.

5. The nomadic fluidized soil solidification production line based on vehicle-mounted unit assembly according to claim 4 is characterized in that: The volume of the mud mixer is 8-12 cubic meters. A high-speed shear stirring device is arranged in the mud mixer, and the rotation speed of the stirring device is 80-120 revolutions per minute.

6. The nomadic fluidized solidified soil production line based on vehicle-mounted unit assembly according to claim 5 is characterized in that: The conveying capacity of the first horizontal slurry pump and the second horizontal slurry pump are both 30-50 cubic meters per hour, and the impeller of the horizontal slurry pump is made of wear-resistant rubber material.

7. The nomadic fluidized solidified soil production line based on vehicle-mounted unit assembly according to claim 6 is characterized in that: The curing agent pulping machine comprises a pulping barrel, a high-speed agitator and a feeding device. The volume of the pulping barrel is 2-4 cubic meters, the rotation speed of the high-speed agitator is 150-200 revolutions per minute, and the feeding device comprises a metering device and an anti-blocking hopper.

8. The nomadic fluidized soil solidification production line based on vehicle-mounted unit assembly according to claim 7 is characterized in that: The water reservoir is an assembled structure, including a plurality of detachable steel plates and sealing strips. A sedimentation area is arranged at the bottom of the water reservoir, and a filter screen is arranged at the water inlet of the water reservoir.

9. The nomadic fluidized solidified soil production line based on vehicle-mounted unit assembly according to claim 8 is characterized in that: The production line also includes a central control system, which is electrically connected to the mud mixer, the curing agent pulping machine, the drum screen, the secondary mixer and the horizontal slurry pump, and is used to control the start and stop and operating parameters of each device.

10. The nomadic fluidized solidified soil production line based on vehicle-mounted unit assembly according to claim 9 is characterized in that: The feed port of the mixing truck is provided with a liquid level sensor, the inner wall of the mixing barrel of the mixing truck is provided with an anti-stick coating, and the rotation speed of the mixing barrel is 8-15 revolutions per minute.

Images