CN115854261B - System and method for controlling and detecting quality of coal slurry conveyed by pipe with gradient adjusting function - Google Patents
System and method for controlling and detecting quality of coal slurry conveyed by pipe with gradient adjusting function Download PDFInfo
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- CN115854261B CN115854261B CN202211635607.8A CN202211635607A CN115854261B CN 115854261 B CN115854261 B CN 115854261B CN 202211635607 A CN202211635607 A CN 202211635607A CN 115854261 B CN115854261 B CN 115854261B
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Abstract
A pipe coal slurry quality control detection system with a gradient adjusting function comprises a coal slurry pretreatment system, a large sample ring pipe detection system and a control system; the large sample ring pipe detection system comprises a first long straight pipe section component, a gradient-adjustable pipe section component and a second long straight pipe section component; the coal slurry pretreatment system is connected with a first long straight pipe section through a detection pipeline; the control system is connected with various devices or apparatuses of the coal slurry pretreatment system and the large sample loop detection system in a wired or wireless mode; the unqualified pulp return pipe is respectively connected with a pulp return port on the top of the buffer tank and the mixing tank; also discloses a corresponding pipe coal slurry quality control and detection method; the coal slurry quality control aspect has complete functions and more controllable parameters; providing experimental conditions of different gradients, and facilitating analysis and determination of reasonable pipeline laying gradients; sampling and detecting the characteristics of coal slurry, and determining the characteristic distribution of the coal slurry in a pipeline; and the automatic control is convenient.
Description
Technical Field
The utility model belongs to the field of coal slurry testing and quality control, and particularly relates to a system and a method for controlling and detecting the quality of pipe coal slurry with a gradient adjusting function.
Background
The existing control system and method for pipeline conveying coal slurry need a perfect coal slurry quality control system and method, and have the problems of incomplete parameter detection and control.
On the other hand, the layout topography conditions of the coal slurry conveying pipeline in the actual environment are often complex and changeable, for example, the pipeline laying can meet the ground with different gradients, and the coal slurry conveying pipeline test in the prior art does not consider the problems of coal slurry test and quality control in the gradient environment.
Disclosure of Invention
The utility model aims to solve the problems that the existing pipeline conveying coal slurry control system and method are not provided with perfect and complete-function coal slurry pipeline experimental conditions, have incomplete parameter detection and control and are difficult to realize accurate pipeline gradient setting and determination.
Aiming at the problems, the utility model adopts the following technical scheme:
a pipe coal slurry quality control detection system with a gradient adjusting function comprises a coal slurry pretreatment system, a large sample ring pipe detection system and a control system;
the large sample ring pipe detection system comprises a first long straight pipe section component, a gradient-adjustable pipe section component and a second long straight pipe section component;
the first long straight pipe section component comprises a first long straight pipe section, and a first electric valve, a first long straight pipe section inlet pressure transmitter, an ultrasonic concentration meter, an ultrasonic densimeter and a first straight pipe section transparent observation pipe section are sequentially arranged on the first long straight pipe section from left to right;
the gradient-adjustable pipe section assembly comprises a first hose, a gradient-adjustable pipe section and a second hose which are sequentially communicated; the first hose is communicated with the right end of the first long straight pipe section, and the left end of the second hose is communicated with the second long straight pipe section assembly; the first hose is provided with a slope-adjustable pipe section inlet pressure transmitter, the slope-adjustable pipe section is sequentially provided with a slope-adjustable pipe section pressure transmitter, a slope-adjustable pipe section transparent observation pipe section and a slope adjusting device, and the second hose is provided with a slope-adjustable pipe section outlet pressure transmitter;
the second long straight pipe section component comprises a second long straight pipe section with the right end communicated with a second hose, and a second transparent observation pipe section, an electromagnetic flowmeter, a pipeline sampling point, a second long straight pipe section outlet pressure transmitter and a second electric valve are sequentially arranged on the second long straight pipe section;
the second long straight pipe section is respectively connected with a pumping system and a reject slurry return pipe through a three-way pipeline;
the coal slurry pretreatment system is connected with a first long straight pipe section through a detection pipeline;
the control system is connected with various devices or apparatuses of the coal slurry pretreatment system and the large sample loop detection system in a wired or wireless mode;
the unqualified pulp return pipe is respectively connected with a pulp return port on the top of the buffer tank and the mixing tank.
Further, the coal slurry pretreatment system comprises a crusher, wherein the lower part of a discharge hole of the crusher is connected with a belt conveyor, a buffer bin is arranged below the belt conveyor, a quantitative coal feeder is arranged below the buffer bin, a feed inlet of a mill is arranged below the quantitative coal feeder, a impurity removing sieve is arranged below a discharge hole of the mill, the impurity removing sieve discharge hole is communicated with a buffer tank, a mixing tank is arranged behind the buffer tank, the lower part of the mixing tank is connected with a mixing tank discharge pump, the mixing tank discharge pump is provided with a variable frequency motor, and the mixing tank discharge pump is connected with a long straight pipe section through a conveying pipeline of a large sample ring pipe detection system; the grinder is provided with a water inlet, the buffer tank and the mixing tank are respectively provided with a first water supplementing inlet and a second water supplementing inlet, and the water inlet, the first water supplementing inlet and the second water supplementing inlet are respectively provided with a metering digital display device.
Further, the gradient adjusting device comprises a bottom buffer pad arranged at the bottom of the gradient adjustable pipe section, a pipe support is arranged at the bottom of the buffer pad, the pipe support is made of flexible deformable materials, the diameter of the pipe support is larger than that of the gradient adjustable pipe section, a moving space of the gradient adjustable pipe section in the pipe support is reserved in the pipe support when the gradient is changed, the bottom of the pipe support is connected with a hydraulic lifting rod, the hydraulic lifting rod is arranged on a base, pulleys are arranged on the base, and when the hydraulic lifting rod ascends or descends, the pipe support and the buffer pad are driven to ascend or descend correspondingly, so that different pipeline laying gradients are formed; the electric screw rod lifting rod is provided with at least two sections of telescopic arms, a motor is arranged to drive the telescopic arms, a nut of the electric screw rod lifting rod is pushed forward, so that the outer sleeve also pushes forward along with the nut, the motor is reversed, the nut is retracted, and the outer sleeve also retracts along with the nut;
the telescopic arm structure comprises the following modes: 1. the sections of the telescopic arms are telescopic section by section in a certain sequence.
2. The telescopic arms are telescopic at the same relative speed.
3. Each arm can independently extend and retract.
4. When the telescopic arm exceeds three sections, any two telescopic mechanisms can be adopted for telescopic operation.
Further, the slope adjusting device comprises a buffer pad arranged at the bottom of the slope adjustable pipe section, a pipe clamp is arranged outside the buffer pad and is made of flexible deformable materials, the diameter of the pipe clamp is larger than that of the slope adjustable pipe section, a moving space of the slope adjustable pipe section in the pipe clamp is reserved in the pipe clamp when the slope is changed, the top of the pipe clamp is connected with an electric screw lifting rod, the electric screw lifting rod is arranged inside a hole of a cross beam, the hole space on the cross beam can be used for rotating the electric screw lifting rod in the hole, and when the electric screw lifting rod ascends or descends, the pipe clamp and the buffer pad are driven to ascend or descend, so that the slope adjustable pipe section is driven to ascend or descend correspondingly, and different pipeline laying slopes are formed.
Further, a first discharge hole is formed in the first long straight pipe section between the first straight pipe section transparent observation pipe section and the first hose; a second discharge hole is also formed in the second long straight pipe section between the second straight pipe section transparent observation pipe section and the second hose; and a third discharge hole is formed in the gradient-adjustable pipe section.
The utility model also relates to a method for regulating and detecting the coal slurry conveyed by the pipe with the gradient regulating function, which is characterized by comprising a gradient regulating method; the method for regulating and controlling water addition amount, coal addition amount and coal slurry amount and detecting the same; coal slurry concentration, coal slurry density, coal slurry particle size distribution, and coal slurry viscosity regulation and detection methods.
Further, the gradient adjusting method comprises the following steps: the gradient-adjustable pipe section is lifted through a pipeline gradient adjusting device installed at the bottom, or lifted through a pipeline gradient adjusting device; lifting the gradient-adjustable pipe section through the pipe gradient adjusting device, changing the height relative to the ground, simulating the pipeline laying gradient under various terrain conditions, and comprehensively considering the coal slurry gradation, the coal slurry concentration and different shutdown time factors, thereby realizing simulation research; carrying out hydraulic gradient tests on slurries with different proportions under different pipe diameters, different concentrations and different flow rates, and carrying out critical flow rate tests on slurries with different pipe diameters and different concentrations; thereby realizing different laying gradient simulation tests;
the gradient-adjustable pipe section carries out a simulation experiment according to a preset gradient, the gradient-adjustable pipe section is provided with a pipeline gradient setting tester, a dial is arranged, and the dial is provided with an angle value and a gradient value numerical display; the method for setting different gradients by the pipeline gradient setting tester comprises the following steps: rotating a rotating wheel of the pipeline gradient setting tester to enable the pointer to be aligned with the scale of the set gradient (angle), enabling a measuring surface of the pipeline gradient setting tester to be in contact with the pipeline, and adjusting the pipeline until the bubble of the leveling pipe is centered;
further, the method for determining the preset gradient is as follows:
i= a ⋅ Q1 + b ⋅(Q2) 1/2 +c ⋅(Q3) 1/3
wherein: i represents the laying gradient; ρ represents the density; q1 represents a slip angle; q2 represents a repose angle; q3 represents an angle of repose; the coefficients a, b and c determine the numerical value or range according to the actual measurement data of the specific conveying materials;
i.e. the laying gradient i is proportional to the slip angle Q1, proportional to the 1/2 power of the angle of repose Q2, proportional to the 1/3 power of the angle of repose Q3;
the sliding angle, the repose angle and the repose angle are measured by the following methods: placing a certain amount of pipeline-conveyed coal slurry in a horizontal transparent pipeline for standing for a period of time, and tilting the pipeline by lifting the horizontal pipeline for a section of time so as to determine the inclination angle (a repose angle) of the slurry deposit layer and the inclination angle (a slip angle) of the pipeline when the deposit layer collapses or slips in the inclined pipeline;
when the solid particles of coal and material accumulate in a mound, the solid particles on the ramp no longer slip when the ramp reaches an angle with the horizontal, which angle is referred to as the angle of repose of the solid particles.
Further, the method for regulating and controlling the water adding amount, the coal adding amount and the coal slurry amount comprises the following steps:
setting a quantitative coal feeder under the buffer bin, strictly controlling the feeding amount of the mill, simultaneously acquiring cumulative feeding amount data of the mill, sending the acquired data to a control system, and performing feedback control adjustment by the control system, wherein the control system reduces the feeding amount of the quantitative coal feeder if the feeding amount is higher, and increases the feeding amount of the quantitative coal feeder if the feeding amount is lower; in addition, a high-level gauge and a low-level gauge are arranged in the buffer bin, and coal storage amount data in the bin are obtained in real time;
the method for regulating and detecting the water addition comprises the following steps: metering digital display devices are arranged at the water inlet of the feeding end of the mill, the first water inlet of the buffer tank and the second water inlet of the mixing tank, and the water adding quantity of each point is controlled; the acquired data are sent to a control system, and the control system performs feedback control adjustment, for example, the water adding amount is higher to reduce the water adding amount of the water adding port of the feeding end of the mill, for example, the water adding amount is lower to increase the water adding amount of the water adding port of the feeding end of the mill;
the method for regulating and detecting the coal slurry comprises the following steps: and a high-level liquid level meter and a low-level liquid level meter and an alarm device are arranged in the buffer tank and the mixing tank, so that coal slurry data in the buffer tank and the mixing tank are obtained in real time.
Further, the method for regulating and detecting the concentration, density, particle size distribution and viscosity of the coal slurry comprises the following steps:
the method for on-line regulation and control and detection of the coal slurry concentration and the coal slurry density comprises the steps of arranging a concentration meter on a pipeline at the discharge end of a buffer coal slurry tank, detecting the coal slurry concentration and the coal slurry density on line, and correspondingly regulating a production system according to a detection result; the acquired data are sent to a control system, and the control system performs feedback control adjustment; if the coal slurry concentration and the coal slurry density are higher, the coal feeding amount of the quantitative coal feeder is reduced or the water feeding amount of the water feeding port of the feeding end of the mill is increased, if the coal slurry concentration and the coal slurry density are lower than the set values, the coal feeding amount of the quantitative coal feeder is increased or the water feeding amount of the water feeding port of the feeding end of the mill is reduced, and the coal feeding amount of the quantitative coal feeder and the water feeding amount of the water feeding port of the feeding end of the mill can be regulated and controlled cooperatively;
the manual regulation and control and detection method for the coal slurry concentration and the coal slurry density comprises the steps of arranging manual sampling points at a discharge end of a mill, a buffer tank and a mixing tank, sampling and detecting at regular time, sampling once every hour, and measuring the coal slurry concentration by using a digital display electric heating constant temperature drying oven and an electronic balance;
the method for regulating and detecting the particle size distribution of the coal slurry comprises detecting the particle size distribution by a particle size analyzer, regulating the particle size distribution of the coal slurry by regulating the addition amount and the proportion of grinding bodies in the mill;
the method for regulating and detecting the viscosity of the coal slurry comprises the step of detecting the viscosity of the coal slurry by using a viscometer.
The utility model has the beneficial effects and characteristics that:
(1) The utility model provides a pipe coal slurry quality control and detection system with gradient adjusting function,
testing different coal slurry flowing states by arranging a long straight pipe section assembly and a gradient-adjustable pipe section; the flow speed of the coal slurry can be adjusted; measuring the flow and the flow velocity of the coal slurry; measuring the on-line concentration and density of the coal slurry; measuring friction loss and hydraulic gradient of the coal slurry; observing the flowing state of the coal slurry and determining the critical flow rate of the coal slurry; the coal slurry quality control aspect has complete functions and more controllable parameters;
(2) The pipe coal slurry quality control detection system with the gradient adjusting function provided by the utility model provides experimental conditions of different gradients, and is convenient for analyzing and determining reasonable pipeline laying gradients; sampling and detecting the characteristics of the coal slurry, and determining the characteristic distribution of the coal slurry in the pipeline.
(3) According to the pipe coal slurry quality control detection system with the gradient adjusting function, provided by the utility model, cables are laid along the pipeline, and each device and instrument are connected with the cables, the power distribution control cabinet, the control system and the monitoring room, so that the automatic control is convenient.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic view of a pipeline grade adjustment device (bottom support mode) according to a preferred embodiment of the present utility model;
FIG. 3 is a schematic view of another pipeline gradient adjusting device (one of the hoisting structures) according to the preferred embodiment of the present utility model;
FIG. 4 is a schematic view of another pipeline gradient adjusting device (second hoisting mode) according to the preferred embodiment of the present utility model;
FIG. 5 is a schematic view of another pipe gradient adjusting device according to the preferred embodiment of the present utility model (third lifting structure);
reference numerals in the drawings denote: 1-a crusher; 2-belt conveyor; 3-a buffer bin; 4-a quantitative coal feeder; 5-grinding; 6-impurity removing sieve; 7-a buffer tank; 8-a mixing tank; 9-a discharge pump of the mixing tank; 10.1-first long straight pipe section, 10.2-second long straight pipe section, 11.1-first electric valve and 11.2-second electric valve; 12-a long straight pipe section inlet pressure transmitter; 13-an ultrasonic concentration meter; 14-ultrasonic densitometer; 15.1-a transparent observation tube section of a first straight tube section; 15.2-transparent observation tube sections of the second straight tube section; 16-hose number one; 17-an adjustable pipe section inlet pressure transmitter; 18.1-pig launch point; 18.2-pig launch point; 18.3-pig launch point; 19-gradient adjustable pipe sections; 20-an adjustable pipe section pressure transmitter; 21-an adjustable tube transparent observation tube section; a No. 22 hose; 23-a slope adjustable pipe section outlet pressure transmitter; 24.1-a first discharge port; 24.2-number two discharge opening; 25-an electromagnetic flowmeter; 26-pipeline sampling points; 27-a second long straight pipe section outlet pressure transmitter; 28-to pumping system piping; 29-pumping system; 30-off-grade pulp return pipe; 31-a waste slurry discharge pipe; 32-a pipeline gradient adjusting device; 32.1-bottom cushion; 32.2-pipe bracket; 32.3-hydraulic lifting lever; 32.4-base; 32.5-pulleys; 32.6-cushion pad; 32.7-pipe clamps; 32.8-an electric lead screw lifting rod; 32.9-a cross beam; 32.10-nuts; 32.11-lift cords; 33-a water adding port; 34.1-number one refill port, 34.2-number two refill port; 35-a metering digital display device; 36-monitoring room; 37-a control system; 38-inspection pipe.
The specific embodiment is as follows:
the following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1:
referring to FIG. 1, the utility model relates to a pipe coal slurry quality control detection system with a gradient adjusting function, which comprises a coal slurry pretreatment system, a large sample ring pipe detection system and a control system;
the coal slurry pretreatment system comprises a crusher 1, wherein the lower part of a discharge hole of the crusher 1 is connected with a belt conveyor 2, a buffer bin 3 is arranged below the belt conveyor 2, a quantitative coal feeder 4 is arranged below the buffer bin 3, a feed inlet of a mill 5 is arranged below the quantitative coal feeder 4, a impurity removing sieve 6 is arranged below the discharge hole of the mill 5, the discharge hole of the impurity removing sieve 6 is communicated with a buffer tank 7, a mixing tank 8 is arranged behind the buffer tank 7, the lower part of the mixing tank 8 is connected with a mixing tank discharge pump 9, the mixing tank discharge pump 9 is provided with a variable frequency motor, and the mixing tank discharge pump 9 is connected with a first long straight pipe section 10.1 through a delivery detection pipeline 38 of a large sample loop detection system; the grinder 5 is provided with a water filling port 33, the buffer tank 7 and the mixing tank 8 are respectively provided with a first water filling port 34.1 and a second water filling port 34.2, and the water filling port 33, the first water filling port 34.1 and the second water filling port 34.2 are respectively provided with a metering digital display device.
The large sample ring pipe detection system comprises a first long straight pipe section component, a gradient-adjustable pipe section component and a second long straight pipe section component; the first long straight pipe section component comprises a first long straight pipe section 10.1, wherein a first electric valve 11.1, a long straight pipe section inlet pressure transmitter 12, an ultrasonic concentration meter 13, an ultrasonic densimeter 14 and a first straight pipe section transparent observation pipe section 15.1 are sequentially arranged on the first long straight pipe section 10.1 from left to right; the gradient-adjustable pipe section assembly comprises a first hose 16, a gradient-adjustable pipe section 19 and a second hose 22 which are communicated in sequence; the first hose 16 is communicated with the right end of the first long straight pipe section 10.1, and the left end of the second hose 22 is communicated with the second long straight pipe section assembly; the first hose 16 is provided with a gradient-adjustable pipe section inlet pressure transmitter 17, the gradient-adjustable pipe section 19 is sequentially provided with a gradient-adjustable pipe section pressure transmitter 20, a gradient-adjustable pipe section transparent observation pipe section 21 and a gradient adjusting device 32, and the second hose 22 is provided with a gradient-adjustable pipe section outlet pressure transmitter 23; the second long straight pipe section assembly comprises a second long straight pipe section 10.2, the right end of which is communicated with a second hose 22, and the second long straight pipe section 10.2 is sequentially provided with a second straight pipe section transparent observation pipe section 15.2, an electromagnetic flowmeter 25, a pipeline sampling point 26, a second long straight pipe section outlet pressure transmitter 27 and a second electric valve 11.2; the second long straight pipe section 10.2 is respectively connected with a pumping system 29 and a reject slurry return pipe 30 through a three-way pipeline; the reject slurry return pipe 30 is respectively connected with slurry return ports on the tank tops of the buffer tank 7 and the mixing tank 8.
The coal slurry pretreatment system is connected with a first long straight pipe section 10.1 through a censoring pipeline 38;
wherein the control system 37 is connected to various devices or apparatuses of the slurry pretreatment system and the bulk loop detection system by wired or wireless means (e.g., by control cables);
referring to fig. 2, the gradient adjusting device 32 includes a bottom buffer pad 32.1 disposed at the bottom of the gradient adjustable pipe section 19, a pipe support 32.2 is disposed at the bottom of the bottom buffer pad 32.1, the pipe support 32.2 is made of flexible deformable material, the diameter of the pipe support 32.2 is larger than that of the gradient adjustable pipe section 19, a moving space of the gradient adjustable pipe section 19 in the pipe support 32.2 is reserved in the pipe support 32.2 when the gradient is changed, the bottom of the pipe support 32.2 is connected with a hydraulic lifting rod 32.3, the hydraulic lifting rod 32.3 is mounted on a base 32.4, a pulley 32.5 is mounted on the base 32.4, and when the hydraulic lifting rod 32.3 is lifted or lowered, the pipe support 32.2 and the bottom buffer pad 32.1 are driven to lift or descend accordingly, so as to drive the gradient adjustable pipe section 19 to lift or descend, thereby forming different pipeline laying gradients; the electric screw lifting rod 32.8 is provided with at least two sections of telescopic arms, a motor is arranged to drive the telescopic arms, a nut of the electric screw lifting rod 32.8 is pushed forward, so that the outer sleeve also pushes forward along with the nut, the motor is reversed, the nut is retracted, and the outer sleeve also retracts along with the nut;
wherein, the telescopic boom structure includes the following modes: 1. the sections of the telescopic arms are telescopic section by section in a certain sequence.
2. The telescopic arms are telescopic at the same relative speed.
3. Each arm can independently extend and retract.
4. When the telescopic arm exceeds three sections, any two telescopic mechanisms can be adopted for telescopic operation.
Preferably, the slope adjustable pipe section 19 is a straight pipe or a bent pipe according to the topography of the actual pipeline arrangement.
As a preferable solution, in order to facilitate cleaning of possible clogging, a first discharge port 24.1 is further provided on the first long straight pipe section 10.1 between the first straight pipe section transparent observation pipe section 15.1 and the first hose 16; a second discharge hole 24.2 is also formed in the second long straight pipe section 10.2 between the second straight pipe section transparent observation pipe section 15.2 and the second hose 22; and a third discharge port 24.3 is arranged on the gradient-adjustable pipe section 19. In addition, pig launching points are mounted at the two ends of the gradient-adjustable pipe section and the left end of the first long straight pipe section 10.1, and specifically comprise a first pig launching point 18.1, a second pig launching point 18.2 and a third pig launching point 18.3.
Example 2:
referring to fig. 3, the difference from embodiment 1 is that this embodiment provides a gradient adjusting device with another structure, the gradient adjusting device 32 includes a buffer pad 32.6 disposed at the bottom of the gradient adjustable pipe section 19, a pipe clamp 32.7 is disposed outside the buffer pad 32.6, the pipe clamp 32.7 is made of flexible deformable material, the diameter of the pipe clamp 32.7 is greater than the diameter of the gradient adjustable pipe section 19, a moving space of the gradient adjustable pipe section 19 in the pipe clamp 32.7 is reserved in the pipe clamp 32.7 when the gradient is changed, the top of the pipe clamp 32.7 is connected with an electric screw lifting rod 32.8, the electric screw lifting rod 32.8 is mounted inside a hole of a cross beam 32.9, the hole space on the cross beam 32.9 can rotate in a hole for the electric screw lifting rod 32.8, and when the electric screw lifting rod 32.8 is lifted or lowered, the pipe clamp 32.7 is driven to be lifted or lowered, so as to drive the gradient adjustable pipe section 19 to correspondingly lift or lower, thereby forming different pipeline gradients.
Example 3:
referring to fig. 4, the difference from embodiment 1 is that the gradient adjusting device with another structure is provided in this embodiment, the elbow 19 is lifted on the pipeline gradient adjusting device 32, the pipeline gradient adjusting device 32 is a screw rod lifting rod, the bottom of the elbow 19 is provided with a buffer pad 32.6, the buffer pad 32.6 is externally provided with a pipe clamp 32.7, the pipe clamp 32.7 is made of flexible deformable material, the diameter of the pipe clamp 32.7 is larger than that of the elbow 19, when the reserved gradient in the pipe clamp 32.7 changes, the moving space of the elbow 19 in the pipe clamp 32.7 is reserved, the top of the pipe clamp 32.7 is connected with an electric screw rod lifting rod 32.8, the electric screw rod lifting rod 32.8 is installed in the opening of the cross beam 32.9, the opening space on the cross beam 32.9 can supply the electric screw rod lifting rod 32.8 to rotate in the hole, and when the electric screw rod lifting rod 32.8 is lifted or lowered, the pipe clamp 32.7 and the buffer pad 19 is lifted or lowered are driven, so that the elbow 19 is correspondingly lifted or lowered, so that different pipeline gradients are formed.
The electric screw lifting rod 32.8 is provided with at least two sections of telescopic arms, a motor is arranged to drive the telescopic arms, a nut of the electric screw lifting rod 32.8 is pushed forward, so that the outer sleeve also pushes forward along with the nut, the motor rotates reversely, the nut retracts, and the outer sleeve also retracts along with the nut.
The telescopic arm structure comprises the following modes:
1. the sections of the telescopic arms are telescopic section by section in a certain sequence.
2. The telescopic arms are telescopic at the same relative speed.
3. Each arm can independently extend and retract.
4. When the telescopic arm exceeds three sections, any two telescopic mechanisms can be adopted for telescopic operation.
Example 4:
referring to fig. 4, the difference from embodiment 1 is that this embodiment provides a gradient adjusting device of another structure, the bent pipe 19 is hoisted on the pipeline gradient adjusting device 32, the pipe clamp is installed on the bent pipe 19, the manual adjusting lifting rod is connected on the pipe clamp, the manual adjusting lifting rod is a hollow cylinder loop bar, the manual adjusting lifting rod is connected on the lifting frame, the loop bar comprises an inner rod and an outer rod, holes are uniformly drilled on the inner rod and the outer rod, and the adjustment of the length of the loop bar is realized through the nuts 32.10 installed on the inner rod and the outer rod. When the manually-adjusted lifting rod connected to the pipe clamp lifts or descends, the pipe clamp and the bent pipe 19 are used for driving the bent pipe 19 to ascend or descend correspondingly.
Example 5:
referring to fig. 5, the difference from embodiment 1 is that this embodiment provides a gradient adjusting device with another structure, where the bent pipe 19 is hoisted on the pipeline gradient adjusting device 32, the pipe clamp is installed on the bent pipe 19, the lifting rope 32.11 is connected to the pipe clamp, the lifting rope is connected to the lifting frame, and the lifting frame is placed on the ground. When the lifting rope connected to the pipe clamp lifts or descends, the pipe clamp and the bent pipe 19 are acted to drive the bent pipe 19 to ascend or descend correspondingly.
The utility model also relates to a pipe coal slurry conveying regulation and detection method with the gradient regulation function, which comprises a gradient regulation method; the method for regulating and controlling water addition amount, coal addition amount and coal slurry amount and detecting the same; coal slurry concentration, coal slurry density, coal slurry particle size distribution, and coal slurry viscosity regulation and detection methods.
The gradient adjusting method comprises the following steps: the gradient-adjustable pipe section 19 is lifted through a pipeline gradient adjusting device 32 installed at the bottom, or lifted through the pipeline gradient adjusting device 32; lifting the gradient adjustable pipe section 19 through the pipeline gradient adjusting device 32, changing the height relative to the ground, simulating the pipeline laying gradient under various terrain conditions, and comprehensively considering the coal slurry grading, the coal slurry concentration and different shutdown time factors so as to realize simulation research; carrying out hydraulic gradient tests on slurries with different proportions under different pipe diameters, different concentrations and different flow rates, and carrying out critical flow rate tests on slurries with different pipe diameters and different concentrations; thereby realizing different laying gradient simulation tests;
the gradient-adjustable pipe section 19 carries out a simulation experiment according to a preset gradient, the gradient-adjustable pipe section 19 is provided with a pipeline gradient setting tester, a dial is arranged, and the dial is provided with an angle value and a gradient value numerical display; the method for setting different gradients by the pipeline gradient setting tester comprises the following steps: rotating a rotating wheel of the pipeline gradient setting tester to enable the pointer to be aligned with the scale of the set gradient (angle), enabling a measuring surface of the pipeline gradient setting tester to be in contact with the pipeline, and adjusting the pipeline until the bubble of the leveling pipe is centered;
the method for determining the preset gradient comprises the following steps:
i= a ⋅ Q1 + b ⋅(Q2) 1/2 +c ⋅(Q3) 1/3
wherein: i represents the laying gradient; ρ represents the density; q1 represents a slip angle; q2 represents a repose angle; q3 represents an angle of repose; the coefficients a, b and c determine the numerical value or range according to the actual measurement data of the specific conveying materials;
i.e. the laying gradient i is proportional to the slip angle Q1, proportional to the 1/2 power of the angle of repose Q2, proportional to the 1/3 power of the angle of repose Q3;
the sliding angle, the repose angle and the repose angle are measured by the following methods: placing a certain amount of pipeline-conveyed coal slurry in a horizontal transparent pipeline for standing for a period of time, and tilting the pipeline by lifting the horizontal pipeline for a section of time so as to determine the inclination angle (a repose angle) of the slurry deposit layer and the inclination angle (a slip angle) of the pipeline when the deposit layer collapses or slips in the inclined pipeline;
when the solid particles of coal and material accumulate in a mound, the solid particles on the ramp no longer slip when the ramp reaches an angle with the horizontal, which angle is referred to as the angle of repose of the solid particles.
The method for regulating and controlling the water adding amount, the coal adding amount and the coal slurry amount comprises the following steps:
the quantitative coal feeder 4 is arranged below the buffer bin 3, the feeding amount of the mill 5 is strictly controlled, meanwhile, the accumulated feeding amount data of the mill 5 can be obtained, the obtained data is sent to the control system 37, the control system 37 performs feedback control adjustment, if the feeding amount is higher, the feeding amount of the quantitative coal feeder 4 is reduced, and if the feeding amount is lower, the feeding amount of the quantitative coal feeder 4 is increased; in addition, a high-level gauge and a low-level gauge are arranged in the buffer bin 3, and coal storage amount data in the bin are obtained in real time;
the method for regulating and detecting the water addition comprises the following steps: metering digital display devices are arranged at the feeding end water inlet 33 of the mill 5, the first water supplementing inlet 34.1 of the buffer tank 7 and the second water supplementing inlet 34.2 of the mixing tank 8, and the water adding quantity of each point is controlled; the acquired data are sent to a control system 37, and the control system 37 performs feedback control adjustment, for example, the water adding amount is higher to reduce the water adding amount of the water adding port at the feeding end of the mill 5, for example, the water adding amount is lower to increase the water adding amount of the water adding port at the feeding end of the mill 5;
the method for regulating and detecting the coal slurry comprises the following steps: and a high-level liquid level meter and a low-level liquid level meter and an alarm device are arranged in the buffer tank 7 and the mixing tank 8, so that coal slurry data in the buffer tank 7 and the mixing tank 8 are obtained in real time.
The method for regulating and detecting the concentration, the density, the particle size distribution and the viscosity of the coal slurry comprises the following steps:
the method for on-line regulation and control and detection of the coal slurry concentration and the coal slurry density comprises the steps of arranging a concentration meter on a pipeline at the discharge end of a buffer coal slurry tank, detecting the coal slurry concentration and the coal slurry density on line, and correspondingly regulating a production system according to a detection result; the acquired data are sent to a control system 37, and the control system 37 performs feedback control adjustment; if the coal slurry concentration and the coal slurry density are higher, the coal feeding amount of the quantitative coal feeder 4 is reduced or the water feeding amount of the water feeding port of the feeding end of the mill 5 is increased, if the coal slurry concentration and the coal slurry density are lower than the set values, the coal feeding amount of the quantitative coal feeder 4 is increased or the water feeding amount of the water feeding port of the feeding end of the mill 5 is reduced, and the coal feeding amount of the quantitative coal feeder 4 and the water feeding amount of the water feeding port of the feeding end of the mill 5 can be cooperatively regulated;
the manual regulation and control and detection method for the coal slurry concentration and the coal slurry density comprises the steps of arranging manual sampling points at the discharge end of a mill 5, a buffer tank 7 and a mixing tank 8, sampling and detecting at regular time, sampling once every 2 hours, and measuring the coal slurry concentration by using a digital display electric heating constant temperature drying oven and an electronic balance;
the method for regulating and detecting the particle size distribution of the coal slurry comprises detecting the particle size distribution by a particle size analyzer, regulating the particle size distribution of the coal slurry by regulating the addition amount of the grinding bodies and the proportion of the grinding bodies in the mill 5; the method for regulating and detecting the viscosity of the coal slurry comprises the step of detecting the viscosity of the coal slurry by using a viscometer.
According to the technical scheme, through setting up a perfect coal slurry quality control system and method and setting up a gradient-adjustable pipe section, semi-industrialization experiment simulation research is carried out to simulate the pipeline laying gradient under various terrain conditions, meanwhile, other parameters are comprehensively considered, a reasonable pipeline laying angle can be determined through experiment simulation, the problem of deposition blockage caused by unsuitable pipeline laying gradient is avoided, and the safe and economical operation of a pipeline conveying system is ensured. The utility model can simulate the pipeline transportation of various complicated terrains, can freely adjust the pipeline transportation state by reducing the pipeline transportation flow rate or increasing the pipeline section gradient, can simulate the pipeline blockage phenomenon by combining the setting of laying gradient and transporting the slurry with different parameters such as different slurry granularity, concentration, particle grading and the like, observes the pipeline blockage process, carries out parameter calculation model research and accumulates precious experience for actual pipeline transportation engineering.
According to the technical scheme, through analysis of a large number of slurry material conveying characteristics, pipeline conveying tests and working conditions, partial results are applied to engineering projects, reference basis is provided for practical engineering application, engineering such as a Shenwei pipeline coal conveying project and a plurality of scientific research projects are completed, combination of experiments and practice of the pipeline engineering scientific research projects is achieved, technical support can be provided for engineering project construction through experimental results, and conversion and landing are achieved by applying theory to engineering.
In the description of the present utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, only for convenience in describing the present utility model and simplifying the description. Rather than indicating or implying that the apparatus or elements herein referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The foregoing has shown and described the basic principles and main features and advantages of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the foregoing embodiments, but rather, the foregoing embodiments and description illustrate the structural relationships and principles of the utility model, and that various changes and modifications may be made therein without departing from the spirit and scope of the utility model as defined in the appended claims.
Claims (6)
1. A method for regulating, controlling and detecting coal slurry conveyed by a pipe with a gradient regulating function is characterized by comprising a gradient regulating method; the method for regulating and controlling water addition amount, coal addition amount and coal slurry amount and detecting the same; coal slurry concentration, coal slurry density, coal slurry particle size distribution, and coal slurry viscosity regulation and detection methods;
the gradient adjusting method comprises the following steps: the gradient-adjustable pipe section (19) is lifted through a pipeline gradient adjusting device (32) installed at the bottom, or lifted through the pipeline gradient adjusting device (32); lifting a gradient-adjustable pipe section (19) through a pipeline gradient adjusting device (32), changing the height relative to the ground, simulating the pipeline laying gradient under various terrain conditions, and simultaneously considering factors of coal slurry grading, coal slurry concentration and different downtime duration to realize simulation research; carrying out hydraulic gradient tests on slurries with different proportions under different pipe diameters, different concentrations and different flow rates, and carrying out critical flow rate tests on slurries with different pipe diameters and different concentrations; realizing different laying gradient simulation tests;
the gradient-adjustable pipe section (19) carries out simulation experiments according to a preset gradient, the gradient-adjustable pipe section (19) is provided with a pipeline gradient setting tester, a dial is arranged, and the dial is provided with an angle value and a gradient value numerical display; the method for setting different gradients by the pipeline gradient setting tester comprises the following steps: rotating a rotating wheel of the pipeline gradient setting tester to enable the pointer to be aligned with the gradient setting scale, enabling the measuring surface of the pipeline gradient setting tester to be in contact with the pipeline, and adjusting the pipeline until the bubble of the leveling pipe is centered;
the method for regulating and controlling the water adding amount, the coal adding amount and the coal slurry amount comprises the following steps: a quantitative coal feeder (4) is arranged under the buffer bin (3), the feeding amount of the mill (5) is strictly controlled, meanwhile, the accumulated feeding amount data of the mill (5) can be obtained, the obtained data is sent to a control system (37), and the control system (37) performs feedback control adjustment, for example, the feeding amount of the quantitative coal feeder (4) is reduced when the feeding amount is higher, for example, the feeding amount of the quantitative coal feeder (4) is increased when the feeding amount is lower; in addition, a high-level charge level indicator and a low-level charge level indicator are arranged in the buffer bin (3), and the coal storage amount data in the bin is obtained in real time;
the method for regulating and detecting the water addition comprises the following steps: metering digital display devices are arranged at a water inlet (33) at the feeding end of the mill (5), a first water supplementing port (34.1) of the buffer tank (7) and a second water supplementing port (34.2) of the mixing tank (8) to control the water adding amount of each point; the acquired data are sent to a control system (37), and the control system (37) performs feedback control adjustment, for example, the water adding amount is higher to reduce the water adding amount of the water adding port at the feeding end of the mill (5), for example, the water adding amount is lower to increase the water adding amount of the water adding port at the feeding end of the mill (5);
the method for regulating and detecting the coal slurry comprises the following steps: a high-level liquid level meter and a low-level liquid level meter and an alarm device are arranged in the buffer tank (7) and the mixing tank (8), and coal slurry data in the buffer tank (7) and the mixing tank (8) are obtained in real time;
the method for regulating and detecting the concentration, the density, the particle size distribution and the viscosity of the coal slurry comprises the following steps:
the method for on-line regulation and control and detection of the coal slurry concentration and the coal slurry density comprises the steps of arranging a concentration meter on a pipeline at the discharge end of a buffer coal slurry tank, detecting the coal slurry concentration and the coal slurry density on line, and correspondingly regulating a production system according to a detection result; the acquired data are sent to a control system (37), and the control system (37) performs feedback control adjustment; if the coal slurry concentration and the coal slurry density are higher, the coal feeding amount of the quantitative coal feeder (4) is reduced or the water feeding amount of the water feeding port of the feeding end of the mill (5) is increased, if the coal slurry concentration and the coal slurry density are lower than the set values, the coal feeding amount of the quantitative coal feeder (4) is increased or the water feeding amount of the water feeding port of the feeding end of the mill (5) is reduced, and the coal feeding amount of the quantitative coal feeder (4) and the water feeding amount of the water feeding port of the feeding end of the mill (5) are cooperatively regulated;
the manual regulation and control and detection method for the coal slurry concentration and the coal slurry density comprises the steps of setting manual sampling points at a discharging end of a mill (5), a buffer tank (7) and a mixing tank (8), sampling and detecting at regular time, sampling once every 2 hours, and measuring the coal slurry concentration by using a digital display electric heating constant temperature drying oven and an electronic balance;
the method for regulating and detecting the particle size distribution of the coal slurry comprises detecting the particle size distribution by a particle size analyzer, regulating the particle size distribution of the coal slurry by regulating the addition amount of a grinding body and the proportion of the grinding body in a grinding machine (5);
the method for regulating and detecting the viscosity of the coal slurry comprises the steps of detecting the viscosity of the coal slurry by a viscometer;
the system used by the pipe coal slurry conveying regulation and control and detection method with the gradient regulation function comprises the following components:
the pipe coal slurry conveying quality control detection system with the gradient adjusting function comprises a coal slurry pretreatment system, a large sample ring pipe detection system and a control system;
the large sample ring pipe detection system comprises a first long straight pipe section component, a gradient-adjustable pipe section component and a second long straight pipe section component;
the first long straight pipe section assembly comprises a first long straight pipe section (10.1), and a first electric valve (11.1), a long straight pipe section inlet pressure transmitter (12), an ultrasonic concentration meter (13), an ultrasonic densimeter (14) and a first straight pipe section transparent observation pipe section (15.1) are sequentially arranged on the first long straight pipe section (10.1) from left to right;
the gradient-adjustable pipe section assembly comprises a first hose (16), a gradient-adjustable pipe section (19) and a second hose (22) which are communicated in sequence; the first hose (16) is communicated with the right end of the first long straight pipe section (10.1), and the left end of the second hose (22) is communicated with the second long straight pipe section assembly; a first hose (16) is provided with a gradient-adjustable pipe section inlet pressure transmitter (17), a gradient-adjustable pipe section (19) is sequentially provided with a gradient-adjustable pipe section pressure transmitter (20), a gradient-adjustable pipe section transparent observation pipe section (21) and a gradient adjusting device (32), and a second hose (22) is provided with a gradient-adjustable pipe section outlet pressure transmitter (23);
the second long straight pipe section assembly comprises a second long straight pipe section (10.2) with the right end communicated with a second hose (22), and the second long straight pipe section (10.2) is sequentially provided with a second straight pipe section transparent observation pipe section (15.2), an electromagnetic flowmeter (25), a pipeline sampling point (26), a second long straight pipe section outlet pressure transmitter (27) and a second electric valve (11.2);
the second long straight pipe section (10.2) is respectively connected with a pumping system (29) and a reject slurry return pipe (30) through a three-way pipeline;
the coal slurry pretreatment system is connected with a first long straight pipe section (10.1) through a detection pipeline (38);
the control system (37) is connected with various devices or apparatuses of the coal slurry pretreatment system and the large sample loop detection system in a wired or wireless mode;
the unqualified pulp return pipe (30) is respectively connected with pulp return ports at the tops of the buffer tank (7) and the mixing tank (8).
2. The method for regulating and detecting the pipe coal slurry with the gradient regulating function according to claim 1, wherein the coal slurry pretreatment system comprises a crusher (1), the lower part of a discharge hole of the crusher (1) is connected with a belt conveyor (2), a buffer bin (3) is arranged below the belt conveyor (2), a quantitative coal feeder (4) is arranged below the buffer bin (3), a feed inlet of a mill (5) is arranged below the quantitative coal feeder (4), a impurity removing sieve (6) is arranged below the discharge hole of the mill (5), the discharge hole of the impurity removing sieve (6) is communicated with a buffer tank (7), a mixing tank (8) is arranged behind the buffer tank (7), the lower part of the mixing tank (8) is connected with a mixing tank discharge pump (9), the mixing tank discharge pump (9) is provided with a variable frequency motor, and the mixing tank discharge pump (9) is connected with a first long straight pipe section (10.1) through a feed pipe (38) of a large sample loop detection system; the mill (5) is provided with a water filling port (33), the buffer tank (7) and the mixing tank (8) are respectively provided with a first water filling port (34.1) and a second water filling port (34.2), and the water filling port (33), the first water filling port (34.1) and the second water filling port (34.2) are respectively provided with a metering digital display device (35).
3. The method for controlling and detecting the coal slurry transported by the pipe with the gradient adjusting function according to claim 1, wherein the gradient adjusting device (32) comprises a bottom buffer pad (32.1) arranged at the bottom of the gradient adjustable pipe section (19), a pipe support (32.2) is arranged at the bottom of the bottom buffer pad (32.1), the pipe support (32.2) is made of flexible deformable materials, the diameter of the pipe support (32.2) is larger than that of the gradient adjustable pipe section (19), a moving space of the gradient adjustable pipe section (19) in the pipe support (32.2) is reserved in the pipe support (32.2) when the gradient is changed, the bottom of the pipe support (32.2) is connected with a hydraulic lifting rod (32.3), the hydraulic lifting rod (32.3) is arranged on a base (32.4), pulleys (32.5) are arranged on the base (32.4), and the hydraulic rod (32.3) is driven to lift or descend when the pipe support (32.2) and the bottom buffer pad (32.1) are driven to lift or descend, so that the gradient adjustable pipe section (19) is driven to correspondingly lift or descend to form different gradient pipelines; the electric screw lifting rod (32.8) is provided with at least two sections of telescopic arms, a motor is arranged to drive the telescopic arms, a nut of the electric screw lifting rod (32.8) is pushed forward, so that the outer sleeve is pushed forward along with the nut, the motor is reversed, the nut is retracted, and the outer sleeve is retracted along with the nut.
4. The method for controlling and detecting the coal slurry transported by the pipe with the gradient adjusting function according to claim 1, wherein the gradient adjusting device (32) comprises a buffer pad (32.6) arranged at the bottom of the gradient adjustable pipe section (19), a pipe clamp (32.7) is arranged outside the buffer pad (32.6), the pipe clamp (32.7) is made of flexible deformable materials, the diameter of the pipe clamp (32.7) is larger than that of the gradient adjustable pipe section (19), a moving space of the gradient adjustable pipe section (19) in the pipe clamp (32.7) is reserved in the pipe clamp (32.7) when the gradient is changed, the top of the pipe clamp (32.7) is connected with an electric screw lifting rod (32.8), the electric screw rod (32.8) is arranged inside a hole of a cross beam (32.9), the hole forming space on the cross beam (32.9) can supply electricity to rotate in the hole, and when the electric screw rod (32.8) is lifted or lowered, the pipe clamp (32.7) is driven to be lifted or lowered, so that the corresponding gradient adjustable pipe section (19) is driven to be lifted or lowered, and the gradient of the pipeline is formed.
5. The method for regulating and detecting the coal slurry transported by the pipe with the gradient regulating function according to claim 1, wherein a first discharge port 24.1 is further arranged on a first long straight pipe section (10.1) between the first straight pipe section (15.1) and a first hose (16); a second discharge hole 24.2 is also formed in the second long straight pipe section (10.2) between the second straight pipe section transparent observation pipe section (15.2) and the second hose (22); and a third discharge port (24.3) is arranged on the gradient-adjustable pipe section (19).
6. The method for regulating and detecting the coal slurry transported by the pipe with the gradient regulating function according to claim 1, which is characterized in that: the method for determining the preset gradient comprises the following steps:
i= a ⋅ Q1 + b ⋅(Q2) 1/2 +c ⋅(Q3) 1/3
wherein: i represents the laying gradient; ρ represents the density; q1 represents a slip angle; q2 represents a repose angle; q3 represents an angle of repose; the coefficients a, b and c determine the numerical value or range according to the actual measurement data of the specific conveying materials;
i.e. the laying gradient i is proportional to the slip angle Q1, proportional to the 1/2 power of the angle of repose Q2, proportional to the 1/3 power of the angle of repose Q3;
the sliding angle, the repose angle and the repose angle are measured by the following methods: placing a certain amount of pipeline-conveyed coal slurry in a horizontal transparent pipeline for standing for a period of time, and lifting the horizontal pipeline for a section to incline the pipeline so as to determine that the inclination angle of the inclined pipeline is a repose angle and the inclination angle of the pipeline is a slip angle when the deposited layer collapses or slips due to the slurry in the inclined pipeline;
when the solid particles of coal and material accumulate in a mound, the solid particles on the ramp no longer slip when the ramp reaches an angle with the horizontal, which angle is referred to as the angle of repose of the solid particles.
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| JPS6136398A (en) * | 1984-07-30 | 1986-02-21 | Babcock Hitachi Kk | Production of highly concentrated coal-water slurry |
| CA2605132A1 (en) * | 2005-04-20 | 2006-10-26 | Csir | Control of slurry flow |
| CN105737902A (en) * | 2016-04-18 | 2016-07-06 | 中南大学 | Experimental test system for phosphogypsum filling, stirring and pumping integrated endless tube |
| CN207921474U (en) * | 2017-12-22 | 2018-09-28 | 中建八局第一建设有限公司 | A kind of tube support arrangement |
| CN109556993B (en) * | 2018-11-30 | 2023-08-18 | 中煤科工集团武汉设计研究院有限公司 | Long-distance slurry pipeline safety detection loop system |
| CN110096727A (en) * | 2019-03-05 | 2019-08-06 | 东华理工大学 | A kind of the determination method and application of the optimal slurry of high dense fill slurry self-flowing pastefill |
| CN111044410B (en) * | 2019-12-31 | 2022-10-11 | 陕西神渭煤炭管道运输有限责任公司 | Device and method for detecting rheological property of coal slurry based on safety ring pipe |
| CN111073716B (en) * | 2020-01-10 | 2023-10-27 | 陕西神渭煤炭管道运输有限责任公司 | Production equipment and production method of pipe coal slurry |
| CN111154522A (en) * | 2020-01-10 | 2020-05-15 | 陕西神渭煤炭管道运输有限责任公司 | Equipment for preparing pipe coal slurry and preparation method thereof |
| CN213655918U (en) * | 2020-10-13 | 2021-07-09 | 北京政平建设投资集团有限公司 | Pipeline leveling support device |
| CN214743804U (en) * | 2021-05-21 | 2021-11-16 | 福建省鸿创建筑工程有限公司 | Municipal water pipe support convenient to adjust slope of water pipe |
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