An automatic mud conditioning system

Abstract

The application discloses a kind of mud automatic dosing conditioning systems and conditioning method thereof, conditioning system includes: mud conditioning agent screening unit, mud automatic dosing conditioning unit, control processing unit, mud automatic dosing conditioning unit includes mud conditioning pool and N dosing barrels, the ultrasonic liquid level meter is equipped above the mud conditioning pool;The mud automatic dosing conditioning unit includes first multichannel peristaltic pump, second multichannel peristaltic pump, N+1 mud dewatering resistance monitoring device, each mud dewatering resistance monitoring device is equipped with flowmeter, each mud dewatering resistance monitoring device is also equipped with self-flushing device;The control processing unit is connected with mud automatic dosing conditioning unit, mud conditioning agent screening unit is all signal connection.The application can realize automatic screening mud conditioning agent, improve mud dewatering efficiency, save conditioning agent adding cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of slurry dewatering and solidification treatment, in particular to a slurry automatic dosing conditioning system and a conditioning method thereof. BACKGROUND

[0002] Slurry is generally a colloidal analysis dispersed system formed by mixing fine particle clay particles and water, and generally has the characteristics of large volume, difficult natural sedimentation, and large dewatering resistance. High water content waste slurry is often produced in the process of engineering pile foundation construction, tunnel excavation and other engineering construction, and also in the process of river and lake dredging and sewage treatment. A large amount of waste slurry directly discharged into the natural environment without treatment will cause large-scale environmental pollution and occupy a large amount of land resources. At present, the most effective method for waste slurry treatment is mechanical dewatering and solidification, which separates water from the slurry to achieve slurry reduction treatment.

[0003] In order to reduce the dewatering resistance of the slurry and improve the efficiency of mechanical dewatering and solidification treatment of the slurry, a suitable conditioning agent needs to be added to the slurry before mechanical dewatering treatment, so that the slurry colloid is destabilized and the water between the solid particles is quickly discharged. There are many types of slurry conditioning agents, such as polyacrylamide (PAM), polyaluminum chloride (PAC), polydiallyldimethylammonium chloride (PDDA), ferric chloride, modified chitosan, etc. Different types of conditioning agents have different effects on the slurry, and the selection of the conditioning agent and the determination of the dosage have a great influence on the subsequent mechanical dewatering effect. At present, the selection of the slurry conditioning agent is almost completely determined by slurry conditioning experiments in the laboratory. Although the data obtained by this method is accurate, it is time-consuming and labor-intensive. In the face of large changes in slurry properties, the selection results of the conditioning agent cannot be updated in time, which will lead to unsatisfactory mechanical dewatering effect of the slurry. If the dewatering resistance of the slurry after being conditioned by different conditioning agents can be quickly determined, and the effects of different conditioning agents are automatically compared and selected, the optimal type and dosage of the conditioning agent required for different batches of slurry can be determined, which can significantly improve the efficiency of slurry dewatering and solidification treatment.

[0004] At present, the instruments commonly used for measuring the dewatering resistance of the slurry include sludge specific resistance measuring instrument and capillary water absorption time measuring instrument, etc. The above instruments are only suitable for measuring the dewatering resistance of the slurry in the laboratory and cannot achieve online monitoring and real-time data feedback. Sensors that can monitor the properties of the slurry, such as Zeta potential instrument, particle size analyzer, and focused beam reflectance measurement instrument, etc., cost tens of thousands of yuan or more, which is too high to be used in actual production.

[0005] Therefore, it is necessary to develop a slurry automatic dosing conditioning system and a conditioning method thereof with simple structure and easy operation, which can automatically select the slurry conditioning agent, improve the dewatering efficiency of the slurry, and save the cost of conditioning agent addition. SUMMARY

[0006] The present application aims to solve the problems in the prior art and provide a mud automatic dosing conditioning system and a conditioning method, which are simple in structure and convenient to operate, can automatically screen mud conditioning agents, improve mud dewatering efficiency and save conditioning agent dosing cost.

[0007] The technical scheme of the present application is as follows: a mud automatic dosing conditioning system, comprising: a mud conditioning agent screening unit, a mud automatic dosing conditioning unit, a control processing unit,

[0008] The mud automatic dosing conditioning unit comprises a mud conditioning tank and N dosing barrels, N is an integer greater than or equal to 2, the bottom of the mud conditioning tank is provided with a feed pipe, the end of the feed pipe is provided with a mud feed pump, the top of the mud conditioning tank is provided with an ultrasonic liquid level meter for monitoring the liquid level, each dosing barrel is provided with a dosing pipe leading to the mud conditioning tank, and each dosing pipe is provided with a metering pump.

[0009] The mud conditioning agent screening unit comprises a first multi-channel peristaltic pump, a second multi-channel peristaltic pump and N+1 mud dewatering resistance monitoring devices, N+1 first branch pipes are arranged on the first multi-channel peristaltic pump to communicate the feed pipe with the bottoms of all the mud dewatering resistance monitoring devices one by one, N second branch pipes are arranged on the second multi-channel peristaltic pump to communicate all the dosing barrels with the bottoms of the N mud dewatering resistance monitoring devices one by one, a monitoring outlet pipe leading to the mud conditioning tank is arranged at the top of each mud dewatering resistance monitoring device, and a flow meter is arranged on each mud dewatering resistance monitoring device to detect the dewatering flow, and the mud conditioning agent screening unit further comprises a self-cleaning device for cleaning the mud dewatering resistance monitoring devices.

[0010] The control processing unit is signal connected with the mud automatic dosing conditioning unit and the mud conditioning agent screening unit.

[0011] Preferably, the control processing unit is signal connected with the mud feed pump, the ultrasonic liquid level meter and the metering pump of the mud automatic dosing conditioning unit, and signal connected with the first multi-channel peristaltic pump, the second multi-channel peristaltic pump, the flow meter and the self-cleaning device of the mud conditioning agent screening unit.

[0012] Preferably, the mud dewatering resistance monitoring device comprises, from bottom to top, a mixing pipe section, a water filtering pipe section and a pressure pipe section arranged coaxially, the bottom of the mixing pipe section is provided with a monitoring mud feed inlet and a monitoring conditioning agent feed inlet, a plurality of turbulence vanes extending upward to the center of the mixing pipe section are arranged on the inner wall of the mixing pipe section, and adjacent two turbulence vanes are arranged in a staggered manner on the two sides in the radial direction, and the upper end of the pressure pipe section is provided with a flushing water inlet and a monitoring outlet.

[0013] Further, the monitoring conditioner feed inlets of the N mud dewatering resistance monitoring devices are connected with corresponding second branch pipes, and a stop valve that is closed under normal conditions is arranged on the conditioner feed inlet of the remaining mud dewatering resistance monitoring device; the monitoring mud inlets of all the mud dewatering resistance monitoring devices are connected with corresponding first branch pipes, the flushing water inlets are connected with the self-flushing device, and the monitoring outlets are connected with corresponding monitoring liquid outlet pipelines.

[0014] Further, the water filtering pipe section comprises a water filtering layer, a gap layer and an outer shell arranged coaxially from inside to outside, the inner wall of the water filtering layer is connected with the pressure pipe section and the mixing pipe section at the upper end and the lower end respectively, the gap layer is an annular hollow cavity formed between the water filtering layer and the outer shell, and the gap layer is provided with a drain pipe downward at the bottom, and the flow meter is arranged at the end of the drain pipe.

[0015] Further, the water filtering layer is formed by single-layer filtering material or is formed by multi-layer filtering material adhered from inside to outside. As a preferred scheme, the water filtering layer comprises three layers of filtering material, which are a stainless steel filter screen, filter cloth and porous ceramic from inside to outside.

[0016] Further, the pressure pipe section is provided with a stirring motor at the top, a stirring central rod is drivingly connected to the lower end of the stirring motor, a stirring brush is arranged on the stirring central rod and used for cleaning the inner wall of the water filtering layer, and the stirring brush is in a spiral shape extending from the top of the water filtering layer to the bottom along the inner wall of the water filtering layer.

[0017] Further, the self-flushing device comprises a clean water tank and a clean water pump, the inlet of the clean water pump is connected with the bottom of the clean water tank, the outlet of the clean water pump is provided with a plurality of third branch pipes, and the third branch pipes are connected with the flushing water inlets of all the mud dewatering resistance monitoring devices one by one. The control processing unit is signal connected with the clean water pump.

[0018] Further, the mud conditioning tank is provided with a discharge pipeline leading to the filter press at the bottom, and a mud discharge pump is arranged on the discharge pipeline. The control processing unit is signal connected with the mud discharge pump.

[0019] The application also provides a conditioning method of the mud automatic dosing conditioning system.

[0020] S1. Turn on the mud inlet pump to pump the to-be-processed mud into the mud conditioning tank, monitor the mud depth in the mud conditioning tank by the ultrasonic liquid level meter, and stop until the mud depth reaches a set value h; in the process of pumping the to-be-processed mud, the following operations are further included:

[0021] a. pumping the slurry into the N+1 slurry dewatering resistance monitoring devices of the slurry automatic dosing conditioning unit at a constant flow rate E, after the slurry fills the slurry dewatering resistance monitoring devices, N kinds of conditioning agents are sent into the corresponding slurry dewatering resistance monitoring devices at a set flow rate A with gradient increase, each set flow rate A lasts for a time period T and 1min≤T≤5min, the moisture flow rate stable value B of all slurry dewatering resistance monitoring devices within each time period T is determined by the flow meter;

[0022] b. the slurry dewatering resistance monitoring device with only slurry passing through is taken as a blank sample, the slurry dewatering resistance monitoring device with both slurry and conditioning agent passing through is taken as a test group, the control processing unit judges whether the slurry automatic dosing conditioning unit is running normally according to the moisture flow rate stable value B data of the blank sample, if yes, the optimal conditioning agent type is determined and the optimal addition volume ratio C is calculated according to the set flow rate A and the moisture flow rate stable value B of all conditioning agents of the test group;

[0023] S2. the control processing unit calculates the slurry volume V in the slurry conditioning tank according to the set value h of the slurry depth and the pre-measured cross-sectional area S of the slurry conditioning tank a , and calculates the total addition volume V of the optimal conditioning agent b =V a ×C, the optimal conditioning agent with a volume of V b is input into the slurry conditioning tank through the metering pump, and the conditioning is completed after 3-5min of stirring;

[0024] S3. the conditioned slurry enters the filter press to complete the dewatering and solidification treatment, the self-flushing device is used to flush the slurry dewatering resistance monitoring device, and the next slurry conditioning cycle operation is waited.

[0025] Preferably, step b judges whether the slurry automatic dosing conditioning unit is running normally, which specifically includes:

[0026] the average value B' of all moisture flow rate stable values B of the blank sample is obtained, the fluctuation rate D of each moisture flow rate stable value B of the blank sample is calculated as (B-B') / B'×100%, if the absolute value of all fluctuation rates D is ≤5%, it is judged that the slurry automatic dosing conditioning unit is running normally.

[0027] Preferably, step b determines the optimal conditioning agent, which specifically includes:

[0028] the moisture flow rate stable values B of all conditioning agents of the test group within all time periods T are compared and the maximum value is selected as B max ,

[0029] if there is only one B max , the corresponding conditioning agent is determined as the optimal conditioning agent, and B max is the optimal addition volume ratio C. maxThe set flow A of the conditioner in the time period is compared, and the minimum is selected as the optimal flow A', and the conditioner corresponding to the optimal flow A' is the optimal conditioner;

[0030] If B max is multiple, all B max are compared, and the minimum is selected as the optimal flow A', and the conditioner corresponding to the optimal flow A' is the optimal conditioner;

[0031] The optimal dosage volume ratio C is calculated in step b, specifically: C is calculated according to the following formula,

[0032] C=A' / E,

[0033] C is the optimal dosage volume ratio C,

[0034] A' is the optimal flow, unit mL / min,

[0035] E is the constant flow of mud, unit mL / min.

[0036] Preferably, in step S1, N=3, the conditioner is APAM anionic polyacrylamide solution, CPAM cationic polyacrylamide solution, and PAC polyaluminum chloride solution. The N kinds of conditioners are respectively located in N dosing barrels.

[0037] Preferably, in step a, a first multi-channel peristaltic pump is started to extract mud at a constant flow E to N+1 mud dewatering resistance monitoring devices of the mud automatic dosing conditioning unit, and after the mud fills the mud dewatering resistance monitoring device, a second multi-channel peristaltic pump is started to send N kinds of conditioners to the corresponding mud dewatering resistance monitoring device at a gradient increasing set flow A.

[0038] Preferably, in step a, the set flow A is set according to the gradient flow of 10, 30, 50, 70, 90, 110 mL / min.

[0039] The beneficial effects of the present application are:

[0040] (1) The mud automatic dosing conditioning unit includes a plurality of mud dewatering resistance monitoring devices, the mud dewatering resistance monitoring devices are in communication with the mud feeding pipe and each medicament barrel, the effect of conditioning mud with different conditioners at different dosages can be obtained during feeding, and the type and dosage of the optimal conditioner can be determined, which can solve the problem of poor conditioning effect in the mud dewatering and solidification disposal of mud with variable properties, and improve the scientificity and accuracy of mud conditioner addition;

[0041] (2) The whole system has high integration degree and can be automatically operated, avoiding the randomness and error of manual addition of conditioners;

[0042] (3) During the operation of this system, the acquisition and analysis of mud conditioning data are completed during the mud feeding process, which will not increase the additional mud treatment time and has no adverse effect on the efficiency of the existing mud dehydration and solidification treatment process;

[0043] (4) This system can expand the number of conditioning agents to be selected by adjusting the number of mud dewatering resistance monitoring devices and reagent barrels. It has a wide adjustment range and strong practicality.

[0044] (5) The system is also equipped with a self-flushing device that can extract clean water to flush the mud dehydration resistance monitoring device to prevent mud deposition and blockage, allowing for quick execution of the next mud conditioning cycle.

[0045] (6) In the conditioning method of this system, the flow rate when pumping the conditioning agent to the mud dewatering resistance monitoring device is set according to a gradient flow rate from low to high, so that the mud can be mixed with the conditioning agent at different dosages, thereby realizing the monitoring of the effect of the conditioning agent at different dosages.

[0046] (7) In the conditioning method of this system, the mud dewatering resistance monitoring device, which only has mud flowing into it, is used as a blank sample to determine whether the mud automatic dosing conditioning unit is operating normally. If not, the control processing unit will perform an alarm analysis to indicate abnormal data. This operation ensures that the mud automatic dosing conditioning unit can screen the optimal conditioning plan under normal operation, ensuring accurate and reliable results. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 Schematic diagram of the automatic dosing and conditioning system for mud of the present invention

[0048] Figure 2 Schematic diagram of the mud dewatering resistance monitoring device

[0049] Figure 3 Axial cross-section of the mud dewatering resistance monitoring device

[0050] Figure 4 for Figure 3 Enlarged view of point A in the middle

[0051] Figure 5 This is a flow chart of the automatic dosing and conditioning method for mud of the present invention.

[0052] Figure 6 Moisture flow rate change curve

[0053] Wherein: 1-mud conditioning tank 2-dosing barrel 3-feeding pipe 4-ultrasonic liquid level meter 5-dosing pipeline 6-first multi-channel peristaltic pump 7-second multi-channel peristaltic pump 8-mud dewatering resistance monitoring device 9-first branch pipe 10-second branch pipe 11-monitoring effluent pipeline 12-flow meter 13-stop valve 14-cleaning water tank 15-cleaning water pump 16-third branch pipe 17-discharge pipeline 18-filter press 19-mud discharge pump 20-control processing unit 21-mud feeding pump 22-metering pump 23-stirring device 81-mixing pipe section (81.1-monitoring mud feeding port 81.2-monitoring conditioning agent feeding port) 82-water filtering pipe section (82.1-water filtering layer 82.2-gap layer 82.3-outer shell 82.4-drainage pipe 82.5-stainless steel filter screen 82.6-filter cloth 82.7-porous ceramic) 83-pressure pipe section (83.1-flushing water inlet 82.4-monitoring discharge port) 84-stirring motor 85-stirring central rod 86-stirring brush 87-turbolator. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical scheme and advantages of the present application more clear, the following examples are used to further illustrate the present application. It should be understood that the specific examples described here are only used to explain the present application, and are not used to limit the present application. The medicines used in the examples are all commercially available products, and the methods used are all conventional methods in the art.

[0055] The present application will be described in detail below with reference to the construction of a certain tunnel.

[0056] The diameter of the tunnel is 4m, the length is 1900m, and it passes through a silt clay layer, a clay layer, a silty sand layer, a sand layer and a miscellaneous fill layer, and the lithology changes greatly, resulting in great changes in the properties of the waste mud during construction. A plate and frame filter press is used on the construction site to dewater and solidify the waste mud. During the implementation process, a single conditioning agent dosing method is difficult to cope with the complex and variable waste mud, and the dewatering efficiency of the mud is low and the effect is poor. The mud automatic dosing conditioning system of the present application is installed on the construction site to cooperate with the plate and frame filter press to dewater and solidify the mud.

[0057] As shown in Figures 1-4 The present application provides a mud automatic dosing conditioning system, which comprises a mud conditioning agent screening unit, a mud automatic dosing conditioning unit and a control processing unit 20.

[0058] The mud automatic dosing conditioning unit comprises a mud conditioning tank 1 and N (N=3 in the embodiment) dosing barrels 2. The mud conditioning tank 1 is provided with a feed pipe 3 at the bottom, and the front end of the feed pipe 3 is provided with a mud feeding pump 21. An ultrasonic liquid level meter 4 is arranged above the mud conditioning tank 1 for monitoring the liquid level. A stirring device 23 is arranged in the mud conditioning tank 1. Different types of mud conditioning agents are stored in each dosing barrel 2. Each dosing barrel 2 is provided with a dosing pipe 5 connected to the mud conditioning tank 1, and a metering pump 22 is arranged on each dosing pipe 5. The metering pump 22 can be used to control the addition amount of the conditioning agent. In the embodiment, the mud flows from front to back in the feed pipe 3 into the mud conditioning tank 1. The three dosing barrels 2 respectively store APAM anionic polyacrylamide solution, CPAM cationic polyacrylamide solution and PAC polyaluminum chloride solution.

[0059] The mud conditioning agent screening unit comprises a first multi-channel peristaltic pump 6, a second multi-channel peristaltic pump 7 and four mud dewatering resistance monitoring devices 8. Four first branch pipes 9 are arranged on the first multi-channel peristaltic pump 6 for connecting the feed pipe 3 and the bottoms of the four mud dewatering resistance monitoring devices 8 one by one. The first multi-channel peristaltic pump 6 is mainly used to pump the mud to be treated into the four mud dewatering resistance monitoring devices 8 through the first branch pipes 9 at the same flow rate. Three second branch pipes 10 are arranged on the second multi-channel peristaltic pump 7 for connecting all the dosing barrels 2 and the bottoms of the three mud dewatering resistance monitoring devices 8 one by one. The second multi-channel peristaltic pump 7 is mainly used to pump the mud conditioning agent into the three mud dewatering resistance monitoring devices 8 through the second branch pipes 10 at the same flow rate to condition the mud. A monitoring outlet pipe 11 is arranged at the top of each mud dewatering resistance monitoring device 8 and connected to the mud conditioning tank 1. A flow meter 12 is arranged on each mud dewatering resistance monitoring device 8 for detecting the dewatering flow rate. A self-flushing device is also arranged on each mud dewatering resistance monitoring device 8.

[0060] The control processing unit 20 mainly collects and processes the data feedback from each component of the system and controls the operation of each component. It can be an existing PLC automatic control system, a microcomputer control system or a computer. In the embodiment, the control processing unit 20 is signal connected with the mud feeding pump 21, the ultrasonic liquid level meter 4 and the metering pump 22 of the mud automatic dosing conditioning unit, so as to control the mud feeding through the mud feeding pump 21, monitor the liquid level through the ultrasonic liquid level meter 4 and control the volume of the added conditioning agent through the metering pump 22. The control processing unit 20 is signal connected with the first multi-channel peristaltic pump 6, the second multi-channel peristaltic pump 7, the flow meter 12 and the self-flushing device of the mud conditioning agent screening unit, so as to control the mud feeding to the mud dewatering resistance monitoring devices 8 through the first multi-channel peristaltic pump 6, control the conditioning agent feeding to the mud dewatering resistance monitoring devices 8 through the second multi-channel peristaltic pump 7 and detect the dewatering flow rate through the flow meter 12.

[0061] The specific structure of the mud dewatering resistance monitoring device 8 is shown in Figures 2-3 The mixing pipe section 81 is provided with a monitoring mud inlet 81.1 and a monitoring conditioning agent inlet 81.2 at the bottom, and a plurality of turbulence vanes 87 extending upward to the center of the mixing pipe section 81 are arranged on the inner wall of the mixing pipe section 81, and adjacent turbulence vanes 87 are staggered on the two sides in the radial direction. The upper end of the pressure pipe section 83 is provided with a flushing water inlet 83.1 and a monitoring outlet 83.2. Among the four mud dewatering resistance monitoring devices 8, the monitoring conditioning agent inlets 81.2 of three mud dewatering resistance monitoring devices 8 are connected with the corresponding second branch pipes 10, and the conditioning agent inlet 81.2 of the remaining one mud dewatering resistance monitoring device 8 is provided with a normally closed stop valve 13; the monitoring mud inlets 81.1 of the four mud dewatering resistance monitoring devices 8 are connected with the corresponding first branch pipes 9, the flushing water inlets 83.1 are connected with the flushing device, and the monitoring outlets 83.2 are connected with the monitoring outlet pipeline 11.

[0062] The water filtering pipe section 82 includes a water filtering layer 82.1, a gap layer 82.2, and an outer shell 82.3 arranged coaxially from the inside to the outside. The inner wall of the water filtering layer 82.1 is in communication with the pressure pipe section 83 and the mixing pipe section 81 at the upper and lower ends, respectively. The gap layer 82.2 is an annular hollow cavity formed between the water filtering layer 82.1 and the outer shell 82.3. The gap layer 82.2 is provided with a drain pipe 82.4 at the bottom, and a flow meter 12 is arranged at the end of the drain pipe 82.4. According to the requirements, the water filtering layer can be formed by a single layer of filtering material or a plurality of layers of filtering material adhered from the inside to the outside. Figure 5 As shown in the figure, the water filtering layer in this embodiment includes three layers of filtering materials, which are a stainless steel filter screen 82.5, a filter cloth 82.6, and a porous ceramic 82.7 from the inside to the outside.

[0063] The pressure pipe section 83 is provided with a stirring motor 84 at the top, and a stirring center rod 85 is drivingly connected to the lower end of the stirring motor 84 to enter the internal space of the water filtering layer 82.1. The stirring center rod 85 is provided with a stirring brush 86 for cleaning the inner wall of the water filtering layer 82.1. The stirring brush 86 is a spiral shape extending from the top of the water filtering layer 82.1 to the bottom along the inner wall of the water filtering layer 82.1.

[0064] In this embodiment, the mud dewatering resistance monitoring device 8 is coaxially arranged with the mud dewatering resistance monitoring device 8. Figures 2-3Mixing pipe section 81 has an axial length of 20 to 30 cm in the vertical direction. The monitoring slurry feed port 81.1 is an axial port located at the center of the bottom surface of mixing pipe section 81, while the monitoring conditioning agent feed port 81.2 is a radial port located slightly above monitoring slurry feed port 81.1. Baffles 87 extend toward and slightly beyond the center of mixing pipe section 81. Staggered radially, baffles 87 provide agitation and mixing of the incoming slurry and conditioning agent. The filter pipe section 82 has an axial length of 20 to 30 cm. The stainless steel filter screen 82.5 is a cylindrical filter screen with an inner diameter of 50 mm, a pore size of 5 mm, and a wall thickness of 0.3 to 0.5 mm. The filter cloth 82.6 is a smooth, wear-resistant nylon or polyester filter cloth with a pore size of 5 microns and a thickness of 0.5 to 1 mm. The porous ceramic 82.7 has a wall thickness of 5 mm and a pore size of 50 to 100 microns. The void layer 82.2 can collect water, which flows out from the drain pipe 82.4 and the specific flow rate is measured by the flow meter 12. The axial length of the pressure pipe section 83 is 20 to 30 cm. The flushing water inlet 83.1 and the monitoring discharge port 83.2 are both horizontal and located on both sides of the radial direction. The stirring motor 84, the stirring center shaft 85 and the stirring brush 86 form a spiral stirrer. The stirring motor 84 is located at the top of the pressure pipe section 83, and the stirring center rod 85 transmits power to the stirring brush 86. The stirring center rod 85 passes through the axis of the pressure pipe section 83. The stirring brush 86 is located inside the water filter section 82 and the outermost side is a row of brushes with a length of 5 to 10 mm. During the rotation of the stirring brush 86, the stainless steel filter screen 82.5 and the filter cloth 82.6 can be brushed to prevent the water filter layer 82.1 from being blocked and affecting the actual water filtration effect. The flow meter 12 is connected to the drainage pipe 82 . 4 of the water filter pipe section 82 , and can measure the flow rate of water collected and flowing out of the void layer of the water filter pipe section in real time, and feed it back to the control processing unit 20 .

[0065] The mud conditioner screening unit also includes a self-flushing device for cleaning the mud dewatering resistance monitoring device 8. In this embodiment, the self-flushing device includes a clean water tank 14 and a clean water pump 15. The clean water pump 15 inlet is connected to the bottom of the clean water tank 14, and four third branch pipes 16 are provided at the clean water pump 15 outlet, which are connected to the four flushing water inlets 83.1 of the mud dewatering resistance monitoring devices 8 in a one-to-one correspondence. A control processing unit 20 is signal-connected to the clean water pump 15 to control the cleaning of the mud dewatering resistance monitoring devices 8.

[0066] A discharge pipe 17 is provided at the bottom of the mud conditioning tank 1, leading to a filter press 18. A mud discharge pump 19 is provided on the discharge pipe 17. A control processing unit 20 is connected to the mud discharge pump 19 for controlling the filter press of the conditioned mud.

[0067] like Figure 5 As shown, the method for conditioning using the above-mentioned automatic mud dosing conditioning system is as follows:

[0068] S1. Mud feed

[0069] The control processing unit 20 starts the mud feeding pump 21 to pump the mud to be treated into the mud conditioning tank 1 through the feeding pipe 3, and the control processing unit 20 monitors the mud depth in the mud conditioning tank 1 through the ultrasonic liquid level meter 4 until the mud depth reaches the set value h (h = 2 m in this embodiment), which lasts for about 10-15 min. During the process of pumping the mud to be treated, the following operations are included:

[0070] a. Mud conditioning data acquisition

[0071] The mud conditioning data acquisition operation lasts for about 8 min, and the process is as follows: within about 10 s after the mud feeding pump 21 starts, the first multi-channel peristaltic pump 6 starts to pump the mud from the feeding pipe 3 to the monitoring mud feeding port 81.1 of the lower mixing pipe joint 81 of the four mud dewatering resistance monitoring devices 8 at a constant flow rate E (E = 800 mL / min in this embodiment), and the flow meter 12 also starts to record the flow data. The flow rate of the first multi-channel peristaltic pump 6 is preferably set to 500-1000 L / min. After the first multi-channel peristaltic pump 6 starts to operate for 2 min, the mud fills each mud dewatering resistance monitoring device 8, and at this time, the second multi-channel peristaltic pump 7 starts to deliver the conditioning agents (APAM anionic polyacrylamide solution, CPAM cationic polyacrylamide solution, and PAC polyaluminum chloride solution) in the three dosing barrels 2 to the monitoring conditioning agent feeding ports 81.2 of the lower mixing pipe joints 81 of the three mud dewatering resistance monitoring devices 8 at a set variable flow rate through the three second branch pipes 10, and the flow rate of the second multi-channel peristaltic pump 7 is preferably set to 0-200 mL / min. The treated mud is disturbed and mixed uniformly with the conditioning agents by the spoiler 87 during the flow in the mixing pipe joint 81, and the dosing and conditioning are completed.

[0072] The slurry passes through mixing pipe section 81 and flows into filter pipe section 82. The slurry in filter pipe section 82 is subjected to pressure from the mud in pressure pipe section 83 above. Some of the water in filter pipe section 82 sequentially passes through stainless steel filter screen 82.5, filter cloth 82.6, and porous ceramic 82.7, and flows into drain pipe 82.4 at the bottom of interstitial layer 82.2. A stirring brush 86 in the center of filter pipe section 82 rotates continuously under the action of stirring motor 54, brushing away solid particles deposited on stainless steel filter screen 82.5 and filter cloth 82.6, preventing clogging of the filter cloth and ensuring that filter pipe section 82 maintains stable water permeability. During this phase, the second multi-channel peristaltic pump 7 sets the flow rate A when pumping the conditioning agent, changing from low to high according to a gradient flow rate of 10, 30, 50, 70, 90, and 110 mL / min. Each set flow rate A lasts for a period of time T = 1 minute, so that the mud in the mixing pipe section 81 can be mixed with the conditioning agent at different dosages, and the effect of the conditioning agent at different dosages can be monitored. The flow meter 12 records the water flow data at each moment and feeds it back to the data analysis unit 20. The data analysis unit 20 obtains the stable water flow value B within each time period T based on the data fed back by the flow meter 12. After the conditioning process of the conditioning agent at different flow rates is completed, the first multi-channel peristaltic pump 6 and the second multi-channel peristaltic pump 7 are turned off.

[0073] b. Mud conditioner selection analysis

[0074] The control processing unit 20 starts to analyze the water flow stability value B obtained from each flow meter 12, and takes the mud dewatering resistance monitoring device 8 into which only mud is passed as a blank sample ( Figure 1 The mud dewatering resistance monitoring device on the right side of the test group) is used as the mud dewatering resistance monitoring device 8 into which mud and conditioning agent are introduced at the same time ( Figure 1 The control processing unit 20 determines whether the mud automatic dosing conditioning unit is operating normally based on the water flow stability value B of the blank sample. If normal, the optimal type of conditioning agent is determined based on the set flow rate A and the water flow stability value B of all conditioning agents in the test group and the optimal dosage volume ratio C is calculated. The specific data are shown in Table 1 below. The flow curve of each flow meter 12 is shown in Figure 6 shown.

[0075] Table 1 Water flow stability value B of mud dewatering resistance monitoring device

[0076]

[0077] Determine whether the automatic dosing and conditioning unit for mud is operating normally:

[0078] The average value of all water flow stability values B of the blank sample is taken as B', and the fluctuation rate D of each water flow stability value B of the blank sample is calculated as (B-B') / B'x100%, if the absolute value of all fluctuation rates D is less than or equal to 5%, it is determined that the mud automatic dosing conditioning unit is running normally. According to the data in Table 1, B' is calculated as 9.87 mL / min, and the fluctuation rate D data is shown in Table 1, and all |D| is less than or equal to 5%, so the mud automatic dosing conditioning unit in this embodiment is running normally. If all |D| is not less than or equal to 5%, it indicates that the mud automatic dosing conditioning unit is not running normally, and the control processing unit 20 will alarm.

[0079] The optimal conditioner is determined as:

[0080] The water flow stability values B of all conditioners in all time periods T of the test group are compared, and the maximum value is selected as B max ,

[0081] If B max is only one, the conditioner corresponding to B max is determined as the optimal conditioner, and the set flow A of the optimal conditioner in the time period where B max is located is determined as the optimal flow A';

[0082] If B max is multiple, the set flow A of the conditioner in the time period where all B max are located is compared, and the minimum one is selected as the optimal flow A', and the conditioner corresponding to the optimal flow A' is the optimal conditioner;

[0083] In this embodiment, B max =45 mL / min, and B max is only one, so the CPAM solution corresponding to B max is the optimal conditioner, the set flow A of the CPAM solution in this time period is 70 mL / min, and the optimal flow A' is 70 mL / min.

[0084] The optimal addition volume ratio C is calculated according to the following formula,

[0085] C=A' / E=70 / 800=0.0875.

[0086] S2. Mud conditioning execution

[0087] The control processing unit 20 calculates the mud volume V in the mud conditioning tank 1 according to the set value h and the pre-measured cross-sectional area S of the mud conditioning tank 1 a = Sxh, and then calculates the total addition volume V of the optimal conditioner b = V a xC; in this embodiment, S=5 m 2 , h=2 m, V a= 10 m 3 , V b = V a x C = 10 x 0.0875 = 0.875 m 3 .

[0088] The mud conditioning tank 1 is inputted with the volume of V b = 0.875 m 3 The optimal conditioner CPAM solution is inputted through the metering pump 22, and the stirring is performed for 3-5 minutes to complete the conditioning.

[0089] S3. Subsequent treatment

[0090] The conditioned mud is then inputted into the filter press 18 through the mud discharge pump 19 to complete the dehydration and solidification treatment. After the mud conditioning is completed, the first multi-channel peristaltic pump 6 starts to reverse, and all the mud in the mud dehydration resistance monitoring device 8 is discharged; at the same time, the clean water pump 15 connected to the clean water tank 14 starts to work, and the third branch pipe 16 extracts clean water to flush the four mud dehydration resistance monitoring devices 8 to prevent the mud from being deposited and blocked. After the cleaning is completed, the overall system returns to the standby state, and waits for the next mud conditioning cycle operation.

Claims

1. A mud automatic dosing conditioning system, characterized in that: include: Mud conditioner screening unit, mud automatic dosing conditioning unit, control processing unit (20), The automatic mud dosing conditioning unit comprises a mud conditioning pool (1) and N dosing barrels (2), where N is an integer ≥ 2. A feed pipe (3) is provided at the bottom of the mud conditioning pool (1), and a mud feed pump (21) is provided at the end of the feed pipe (3). An ultrasonic level meter (4) is provided above the mud conditioning pool (1) for monitoring the liquid level. Each dosing barrel (2) is provided with a dosing pipe (5) leading to the mud conditioning pool (1), and each dosing pipe (5) is provided with a metering pump (22). The mud conditioner screening unit comprises a first multi-channel peristaltic pump (6), a second multi-channel peristaltic pump (7), and N+1 mud dewatering resistance monitoring devices (8). The first multi-channel peristaltic pump (6) is provided with N+1 first branch pipes (9) for connecting the feed pipe (3) with the bottom of all mud dewatering resistance monitoring devices (8) in a one-to-one correspondence. The second multi-channel peristaltic pump (7) is provided with N second branch pipes (10) for connecting all dosing barrels (2) with the bottom of N mud dewatering resistance monitoring devices (8) in a one-to-one correspondence. The top of each mud dewatering resistance monitoring device (8) is provided with a monitoring liquid outlet pipe (11) leading to the mud conditioning tank (1), and each mud dewatering resistance monitoring device (8) is provided with a flow meter (12) for detecting the dewatering flow. The mud conditioner screening unit also includes a self-flushing device for cleaning the mud dewatering resistance monitoring device (8); The mud dewatering resistance monitoring device (8) comprises a mixing pipe section (81), a water filter pipe section (82), and a pressure pipe section (83) coaxially arranged from bottom to top, wherein the bottom of the mixing pipe section (81) is provided with a monitoring mud feed port (81.1) and a monitoring conditioner feed port (81.2), the inner wall of the mixing pipe section (81) is provided with a plurality of spoilers (87) extending upward toward the center of the mixing pipe section (81), and adjacent spoilers (87) are staggered on both sides of the radial direction, and the upper end of the pressure pipe section (83) is provided with a flushing water inlet (83.1) and a monitoring discharge port (83.2); The water filter pipe section (82) comprises a water filter layer (82.1), a void layer (82.2), and an outer shell (82.3) coaxially arranged from the inside outward, the upper and lower ends of the inner wall of the water filter layer (82.1) are respectively connected to the pressure pipe section (83) and the mixing pipe section (81), the void layer (82.2) is an annular hollow cavity formed between the water filter layer (82.1) and the outer shell (82.3), the bottom of the void layer (82.2) is provided with a drainage pipe (82.4) facing downward, and the flow meter (12) is arranged at the end of the drainage pipe (82.4); A stirring motor (84) is provided at the top of the pressure pipe section (83), and a stirring center rod (85) is connected to the lower end of the stirring motor (84). A stirring brush (86) is provided on the stirring center rod (85) for cleaning the inner wall of the water filter layer (82.1). The stirring brush (86) is spirally shaped and extends from the top of the water filter layer (82.1) along the inner wall of the water filter layer (82.1) to the bottom. The control processing unit (20) is signal-connected to the mud automatic dosing and conditioning unit and the mud conditioning agent screening unit.

2. The automatic dosing and conditioning system for mud according to claim 1, characterized in that: The monitoring conditioning agent feed ports (81.2) of N mud dewatering resistance monitoring devices (8) are all connected to the corresponding second branch pipe (10), and the conditioning agent feed port (81.2) of the remaining mud dewatering resistance monitoring device (8) is provided with a stop valve (13) that is closed under normal conditions; the monitoring mud feed ports (81.1) of all mud dewatering resistance monitoring devices (8) are all connected to the corresponding first branch pipe (9), the flushing water inlets (83.1) are all connected to the self-flushing device, and the monitoring discharge ports (83.2) are all connected to the corresponding monitoring liquid outlet pipe (11).

3. The automatic mud dosing and conditioning system according to claim 1, characterized in that: The self-flushing device comprises a clean water tank (14) and a clean water pump (15), wherein the inlet of the clean water pump (15) is connected to the bottom of the clean water tank (14), and a plurality of third branch pipes (16) are provided at the outlet of the clean water pump (15) and are connected in a one-to-one correspondence with the flushing water inlets (83.1) of all the mud dewatering resistance monitoring devices (8).

4. The automatic dosing and conditioning system for mud according to claim 1, characterized in that: A discharge pipe (17) is provided at the bottom of the mud conditioning tank (1) and leads to a filter press (18). A mud discharge pump (19) is provided on the discharge pipe (17).

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