CN109974961B - Wind tunnel simulation test method for dust collection amount of bucket wheel type stacker-reclaimer - Google Patents
Wind tunnel simulation test method for dust collection amount of bucket wheel type stacker-reclaimer Download PDFInfo
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Abstract
The invention discloses a dust-collecting capacity wind tunnel simulation test model device and a test method of a bucket-wheel stacker-reclaimer, and the dust-collecting capacity wind tunnel simulation test model device of the bucket-wheel stacker-reclaimer is structurally characterized in that a screw rod is rotationally connected to a screw rod bracket, one end of the screw rod is connected with an output shaft of a power device, the other end of the screw rod is connected with a bucket-wheel head model, the screw rod is driven to rotate by the power device, the authenticity and the accuracy of a wind tunnel simulation test are ensured, the dust-collecting capacity wind tunnel simulation test model device and a test material pile of the bucket-wheel stacker-reclaimer before and after the test are respectively weighed, the dust-collecting capacity generated during the material taking operation of the bucket-wheel stacker-reclaimer can be accurately calculated, and a method for effectively evaluating the dust.
Description
Technical Field
The invention relates to the technical field of atmospheric dust pollution prevention and control and environmental protection, in particular to a wind tunnel simulation test method for the dust collecting capacity of a bucket wheel type stacker-reclaimer.
Background
At present, the atmospheric environment of China is not optimistic, and the annual book of atmospheric environment pollution of China in 2000 shows that: currently, the most important pollutant in atmospheric pollution is particulate pollution. The particulate pollution components are complex and have a plurality of sources, and in addition, the ecological environment is continuously worsened in recent years, so that the particulate pollution becomes the leading factor of air pollution of most cities in China. For example, China is in the peak period of the increase of the throughput of coal and ore in coastal ports, and the problems of dust emission and diffusion pollution caused by the increase are very serious.
The estimation of the port dust generation amount is the basis for port dust pollution prevention, but at present, dust sources stored and operated in open air under the action of wind power are discharged in an unorganized mode, and are distributed in port areas in a large number, the process is complex, the pollution change is large, and the emission source amount is difficult to estimate. And because the bucket wheel stacker-reclaimer is in dynamic operation when taking materials, it has great randomness to cause the movement of dust particles in the atmosphere, so it has great limitation to adopt the routine actual measurement or theoretical prediction method to analyze the dust rising amount generated when the bucket wheel stacker-reclaimer is in dynamic operation.
Therefore, a problem to be solved by those skilled in the art is how to provide a wind tunnel simulation test method for simulating the dust collection amount generated during material collecting operation of a bucket-wheel stacker-reclaimer.
Disclosure of Invention
In view of the above, the invention provides a wind tunnel simulation test method for dust collection amount of a bucket wheel type stacker-reclaimer, which can simulate dynamic material collection operation of the bucket wheel type stacker-reclaimer and provide a relatively accurate calculation method for dust collection amount generated by the bucket wheel type stacker-reclaimer during dynamic material collection operation.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a bucket wheel formula stacker-reclaimer dust-collecting volume wind-tunnel simulation test model device, includes bucket wheel machine head model, screw bracket, lead screw and power device, the lead screw rotates to be connected screw bracket is last, and one end with power device's output shaft, the other end is connected bucket wheel machine head model, by power device drive rotates.
According to the invention, the prototype bucket wheel head is simplified through the bucket wheel head model, the lead screw is supported through the lead screw support, and the power device drives the lead screw to rotate relative to the support frame, so that the dynamic process of rotating and taking materials of the bucket wheel head prototype can be simulated, and necessary equipment is provided for simulating the calculation of dust emission during the dynamic process of rotating and taking materials of the bucket wheel head; and the technical characteristic that the screw rod is rotationally connected with the screw rod bracket is adopted, so that the bucket wheel machine head model arranged at one end of the screw rod can stably advance according to the test requirements in the test process.
Preferably, the screw rod support is provided with a balancing weight, the bucket wheel machine head model provides a balancing weight, and the stability of the whole dust collection wind tunnel simulation test model device of the bucket wheel type stacker-reclaimer is guaranteed at a high wind speed.
Preferably, the diameter of the lead screw is not less than 1.2cm, so that the lead screw can bear heavier load.
Preferably, the screw rod is provided with threads, the distance between the thread starting section and the end face of the bucket wheel head model is not less than 1m, and the interference of the screw rod support and the counterweight part on the test is avoided.
Preferably, the length of the thread interval on the screw rod ensures that the model advances at a test speed, and the test time requirement is met.
Preferably, the power device comprises a motor and a motor support, the motor is fixed on the motor support, the motor is electrically connected with a PLC, and the angular speed of the motor is controlled through a model switch on the PLC, so that the angular speed of the motor can be flexibly controlled, the motor is ensured to operate according to the angular speed required by a test, and a foundation is provided for the motor to control the bucket wheel machine head model to calculate the dust emission amount in the material taking process at different angular speeds.
Preferably, a plurality of bucket wheels are uniformly arranged around the bucket wheel head model, each bucket wheel is provided with a rectangular opening, and each rectangular opening is the same in depth, so that the accuracy of the test result is improved.
Preferably, the appearance of the prototype bucket wheel head simulated by the bucket wheel head model follows a geometric similarity principle, and the geometric similarity ratio is lambda, so that the authenticity and the accuracy of the test result are improved.
A wind tunnel simulation test model device for dust collection capacity of a bucket wheel type stacker-reclaimer comprises the following steps:
cleaning dust in a wind tunnel to avoid measurement interference;
weighing the test material before the test, stacking the test material in a wind tunnel, and recording the weight of a material pile before the test as M1;
thirdly, preparing a dust-collecting wind tunnel simulation test model device of the bucket wheel type stacker-reclaimer, weighing the dust-collecting wind tunnel simulation test model device of the bucket wheel type stacker-reclaimer before testing, and recording the net weight of the dust-collecting wind tunnel simulation test model device of the bucket wheel type stacker-reclaimer before testing as M2;
setting a wind tunnel simulation test model device of the dust collection capacity of the bucket wheel type stacker-reclaimer before the test in a wind tunnel, and inserting a bucket wheel head model into a material pile before the test;
step five, starting a wind tunnel fan to reach a test wind speed;
starting a power device, driving a bucket wheel machine head model to rotate at the same angular speed as the prototype to simulate rotation material taking operation, stirring the bucket wheel machine head model in a material pile before the test to take materials, blowing away part of test materials by a wind tunnel fan to form dust in the stirring process, forming a material pile after the test by the material pile before the test, and stopping the wind tunnel fan when the test meets the preset test time t;
step seven, after the test is finished, weighing the tested bucket-wheel stacker-reclaimer dust-collecting volume wind tunnel simulation test model device and the tested material stack respectively, and recording the total weight of the tested bucket-wheel stacker-reclaimer dust-collecting volume wind tunnel simulation test model device and the tested material stack as M3;
step eight, calculating the dust volume M of the modelm＝M1+M2-M3；
Step nine, calculating the total material taking quantity Q of the modelm＝M1；
Step ten, obtaining the dust collection amount generated by the bucket-wheel stacker-reclaimer during material taking dynamic operation under the working condition in an actual prototype according to the model prototype similarity ratio lambda, wherein the calculation formula is as follows:
wherein, lambda is the ratio of the dust-forming rate of the model to the dust-forming rate of the prototype and is the geometric similarity ratio of the model to the prototype; qmFor the total material quantity taken from the model, MmCalculating dust pickup, Q, for the modelpFor the actual prototype total material quantity, MpCalculating the dust amount for the actual prototype, wherein η is M/Q × 100%, and the physical meaning is the percentage of the dust amount M to the total material taking amount Q;
and step eleven, adjusting the test wind direction and the wind speed, adjusting the water content of the test material, and repeating the step one to the step eleven to obtain the change rule of the dust emission amount in the actual prototype along with the factors of the wind speed, the wind direction and the water content.
The invention provides a relatively accurate calculation method for the dust collection amount generated by the dynamic operation of the bucket wheel machine in the rotating material taking process through the wind tunnel simulation test method, and solves the technical problem that the dust collection amount generated by the dynamic operation of the bucket wheel machine in the rotating material taking process is difficult to accurately calculate by adopting a conventional actual measurement or theoretical prediction analysis method because the movement of dust particles in the atmosphere is relatively random due to the port dynamic operation.
Preferably, the annual dust rising amount expected value of the bucket-wheel stacker-reclaimer in the material taking dynamic operation process of the bucket-wheel stacker-reclaimer is evaluated according to the meteorological data wind speed and wind direction statistical data, the field water content condition and the dust rising amount wind tunnel simulation test model device operation time of the bucket-wheel stacker-reclaimer in the actual prototype and by combining the simulation test result.
Compared with the prior art, the invention discloses a wind tunnel simulation test model device and a test method for the dust collection capacity of the bucket wheel type stacker-reclaimer, and the following technical effects can be realized:
1. the appearance of the prototype bucket wheel head simulated by the bucket wheel head model follows the geometric similarity principle, and the geometric similarity ratio is lambda, so that the authenticity and the accuracy of calculation are realized through a wind tunnel test model and a wind tunnel test method.
2. The invention provides a relatively accurate calculation method for the dust collection amount generated by the dynamic operation of the bucket wheel machine in the rotating material taking process through the wind tunnel simulation test method, and solves the technical problem that the dust collection amount generated by the dynamic operation of the bucket wheel machine in the rotating material taking process is difficult to accurately calculate by adopting a conventional actual measurement or theoretical prediction analysis method because the movement of dust particles in the atmosphere is relatively random due to the port dynamic operation.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a structural diagram of a wind tunnel simulation test model device for dust collection capacity of a bucket wheel type stacker-reclaimer;
fig. 2 is a schematic diagram of a wind tunnel simulation test method for dust collection capacity of a bucket wheel type stacker-reclaimer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a wind tunnel simulation test model device and a test method for the dust pick-up amount of a bucket-wheel stacker-reclaimer, which can simulate the dynamic operation of material taking of the bucket-wheel stacker-reclaimer and provide a relatively accurate calculation method for the dust pick-up amount generated by the bucket-wheel stacker-reclaimer during the dynamic operation of material taking.
The utility model provides a bucket wheel formula stacker-reclaimer dust-collecting volume wind-tunnel simulation test model device, includes bucket wheel machine head model 1, lead screw support 4, lead screw 2 and power device 3, and lead screw 2 rotates to be connected on lead screw support 4, and one end is connected with power device 3's output shaft, and bucket wheel machine head model 1 is connected to the other end, is rotated by power device 3 drive.
In order to further optimize the above technical solution, the screw bracket 4 is provided with a weight block 41.
In order to further optimize the technical scheme, the diameter of the lead screw 2 is not less than 1.2 cm.
In order to further optimize the technical scheme, the screw rod 2 is provided with threads, and the distance between the starting section of the threads and the end face of the bucket wheel head model 1 is not less than 1 m.
In order to further optimize the above technical solution, the power device 3 includes a motor 31 and a motor bracket 32, the motor 31 is fixed on the motor bracket 32, and the motor 31 is electrically connected to a PLC.
In order to further optimize the technical scheme, a plurality of bucket wheels 11 are uniformly arranged around the bucket wheel head model 1, each bucket wheel 11 is provided with a rectangular opening 111, and the depth of each rectangular opening 111 is the same.
In order to further optimize the technical scheme, the shape of the prototype bucket wheel head simulated by the bucket wheel head model 1 follows the geometric similarity principle, and the geometric similarity ratio is lambda.
A wind tunnel simulation test method for dust collection capacity of a bucket wheel type stacker-reclaimer comprises the following steps:
cleaning dust in a wind tunnel to avoid measurement interference;
weighing the test material before the test, stacking the test material in a wind tunnel, and recording the weight of a material pile before the test as M1;
thirdly, preparing a dust-collecting wind tunnel simulation test model device of the bucket wheel type stacker-reclaimer, weighing the dust-collecting wind tunnel simulation test model device of the bucket wheel type stacker-reclaimer before testing, and recording the net weight of the dust-collecting wind tunnel simulation test model device of the bucket wheel type stacker-reclaimer before testing as M2;
setting a wind tunnel simulation test model device of the dust collection capacity of the bucket wheel type stacker-reclaimer before the test in a wind tunnel, and inserting a bucket wheel head model 1 into a material pile before the test;
step five, starting a wind tunnel fan to reach a test wind speed;
step six, starting a power device 3, driving a bucket wheel machine head model 1 to rotate at the same angular speed as the prototype to simulate rotation material taking operation, enabling the bucket wheel machine head model 1 to stir and take materials in a material pile before the test, blowing away part of the test materials by a wind tunnel fan to form dust in the stirring process, forming a material pile after the test by the material pile before the test, and stopping the wind tunnel fan when the test meets the preset test time t;
step seven, after the test is finished, weighing the tested bucket-wheel stacker-reclaimer dust-collecting volume wind tunnel simulation test model device and the tested material stack respectively, and recording the total weight of the tested bucket-wheel stacker-reclaimer dust-collecting volume wind tunnel simulation test model device and the tested material stack as M3;
step eight, calculating the dust volume M of the modelm＝M1+M2-M3；
Step nine, calculating the total material taking quantity Q of the modelm＝M1；
Step ten, obtaining the dust amount of the bucket wheel type stacker-reclaimer in the material taking process under the working condition in the actual prototype through the model prototype similarity ratio lambda, wherein the calculation formula is as follows:
wherein, lambda is the ratio of the dust-forming rate of the model to the dust-forming rate of the prototype and is the geometric similarity ratio of the model to the prototype; qmFor the total material quantity taken from the model, MmCalculating dust pickup, Q, for the modelpFor the actual prototype total material quantity, MpCalculating the dust amount for the actual prototype, wherein η is M/Q × 100%, and the physical meaning is the percentage of the dust amount M to the total material taking amount Q;
and step eleven, adjusting the test wind direction and the wind speed, adjusting the water content of the test material, and repeating the step one to the step eleven to obtain the change rule of the dust emission amount in the actual prototype along with the factors of the wind speed, the wind direction and the water content.
In order to further optimize the technical scheme, the annual dust rising amount expected value of the bucket-wheel stacker-reclaimer of the bulk cargo port in the material taking dynamic operation process is evaluated according to meteorological data wind speed and wind direction statistical data, field water content conditions and the dust rising amount wind tunnel simulation test model device operation time of the bucket-wheel stacker-reclaimer in an actual prototype and by combining simulation test results.
Example (b):
the embodiment of the invention discloses a wind tunnel simulation test method for the dust collection capacity of a bucket wheel type stacker-reclaimer, which comprises the following steps:
cleaning dust in a wind tunnel to avoid measurement interference;
weighing the test material before the test, stacking the test material in a wind tunnel, and recording the weight of a material pile before the test as M1;
thirdly, preparing a dust-collecting wind tunnel simulation test model device of the bucket wheel type stacker-reclaimer, weighing the dust-collecting wind tunnel simulation test model device of the bucket wheel type stacker-reclaimer before testing, and recording the net weight of the dust-collecting wind tunnel simulation test model device of the bucket wheel type stacker-reclaimer before testing as M2;
setting a wind tunnel simulation test model device of the dust collection capacity of the bucket wheel type stacker-reclaimer before the test in a wind tunnel, and inserting a bucket wheel head model 1 into a material pile before the test;
step five, starting a wind tunnel fan to reach a test wind speed;
step six, starting a power device 3, driving a bucket wheel machine head model 1 to rotate at the same angular speed as the prototype to simulate rotation material taking operation, enabling the bucket wheel machine head model 1 to stir and take materials in a material pile before the test, blowing away part of the test materials by a wind tunnel fan to form dust in the stirring process, forming a material pile after the test by the material pile before the test, and stopping the wind tunnel fan when the test meets the preset test time t;
step seven, after the test is finished, weighing the tested bucket-wheel stacker-reclaimer dust-collecting volume wind tunnel simulation test model device and the tested material stack respectively, and recording the total weight of the tested bucket-wheel stacker-reclaimer dust-collecting volume wind tunnel simulation test model device and the tested material stack as M3;
step eight, calculating the dust volume M of the modelm＝M1+M2-M3；
Step nine, calculating the total material taking quantity Q of the modelm＝M1；
Step ten, obtaining the dust collection amount generated by the bucket-wheel stacker-reclaimer during material taking dynamic operation under the working condition in an actual prototype according to the model prototype similarity ratio lambda, wherein the calculation formula is as follows:
wherein, lambda is the dust generation rate of the model and the dust generation rate of the prototypeThe dust rate ratio is the geometric similarity ratio of the model and the prototype; qmFor the total material quantity taken from the model, MmCalculating dust pickup, Q, for the modelpFor the actual prototype total material quantity, MpCalculating the dust amount for the actual prototype, wherein η is M/Q × 100%, and the physical meaning is the percentage of the dust amount M to the total material taking amount Q;
step eleven, adjusting the test wind direction and the wind speed, adjusting the water content of the test material, and repeating the step one to the step eleven to obtain the change rule of the dust emission amount in the actual prototype along with the factors of the wind speed, the wind direction and the water content;
and step twelve, evaluating the annual dust rise expected value of the bucket-wheel stacker-reclaimer in the material taking dynamic operation process according to the meteorological data wind speed and wind direction statistical data, the field water content condition and the dust rise wind tunnel simulation test model device operation time of the bucket-wheel stacker-reclaimer in the actual prototype and combining the simulation test result.
The invention relates to a wind tunnel simulation test model device for dust collection capacity of a bucket wheel type stacker-reclaimer, which comprises a bucket wheel machine head model 1, a lead screw bracket 4, a lead screw 2 and a power device 3, wherein the lead screw 2 is rotationally connected to the lead screw bracket 4, and the lead screw bracket 4 is provided with a balancing weight 41; the diameter of the screw rod 2 is not less than 1.2cm, threads are arranged on the screw rod 2, and the distance between the starting section of the threads and the end face of the bucket wheel machine head model 1 is not less than 1 m; a plurality of bucket wheels 11 are uniformly arranged around the bucket wheel head model 1, each bucket wheel 11 is provided with a rectangular opening 111, and the depth of each rectangular opening 111 is the same; the shape of a prototype bucket wheel head simulated by the bucket wheel head model 1 follows a geometric similarity principle, and the geometric similarity ratio is lambda;
power device 3 includes motor 31 and motor support 32, motor 31 is fixed on motor support 32, 2 one end of lead screw and motor 31's output shaft, bucket wheel head model 1 is connected to the other end, 31 electric connection of motor has PLC, model on-off control motor 31's angular velocity on PLC, guarantee that motor 31 operates according to the angular velocity of experimental requirement, calculate the dust rise volume of getting the material in-process under different angular velocity for motor 31 control bucket wheel head 1 model and provide the basis.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. A wind tunnel simulation test method for dust collection capacity of a bucket wheel type stacker-reclaimer is characterized by comprising the following steps:
cleaning dust in a wind tunnel to avoid measurement interference;
weighing the test material before the test, stacking the test material in a wind tunnel, and recording the weight of a material pile before the test as M1;
thirdly, preparing a dust-collecting wind tunnel simulation test model device of the bucket wheel type stacker-reclaimer, weighing the dust-collecting wind tunnel simulation test model device of the bucket wheel type stacker-reclaimer before testing, and recording the net weight of the dust-collecting wind tunnel simulation test model device of the bucket wheel type stacker-reclaimer before testing as M2;
setting a wind tunnel simulation test model device of the dust collection capacity of the bucket wheel type stacker-reclaimer before the test in a wind tunnel, and inserting a bucket wheel machine head model (1) into a material pile before the test;
step five, starting a wind tunnel fan to reach a test wind speed;
step six, starting a power device (3), driving a bucket wheel machine head model (1) to rotate at the same angular speed as the prototype to simulate rotation material taking operation, enabling the bucket wheel machine head model (1) to stir and take materials in a material pile before the test, blowing away part of test materials by a wind tunnel fan to form dust in the stirring process, forming the material pile after the test by the material pile before the test, and stopping the wind tunnel fan when the test meets the preset test time t;
step seven, after the test is finished, weighing the tested bucket-wheel stacker-reclaimer dust-collecting volume wind tunnel simulation test model device and the tested material stack respectively, and recording the total weight of the tested bucket-wheel stacker-reclaimer dust-collecting volume wind tunnel simulation test model device and the tested material stack as M3;
step eight, calculating the dust volume M of the modelm＝M1+M2-M3；
Step nine, calculating the total material taking quantity Q of the modelm＝M1；
Step ten, obtaining the dust collection amount generated by the bucket-wheel stacker-reclaimer during material taking dynamic operation under the working condition in an actual prototype according to the model prototype similarity ratio lambda, wherein the calculation formula is as follows:
wherein, lambda is the ratio of the dust-forming rate of the model to the dust-forming rate of the prototype and is the geometric similarity ratio of the model to the prototype; qmFor the total material quantity taken from the model, MmCalculating dust pickup, Q, for the modelpFor the actual prototype total material quantity, MpCalculating the dust amount for the actual prototype, wherein η is M/Q × 100%, and the physical meaning is the percentage of the dust amount M to the total material taking amount Q;
and step eleven, adjusting the test wind direction and the wind speed, adjusting the water content of the test material, and repeating the step one to the step eleven to obtain the change rule of the dust emission amount in the actual prototype along with the factors of the wind speed, the wind direction and the water content.
2. The wind tunnel simulation test method for the dust collection capacity of the bucket wheel type stacker-reclaimer according to claim 1, wherein the power device (3) comprises a motor (31) and a motor bracket (32), the motor (31) is fixed on the motor bracket (32), and the motor (31) is electrically connected with a PLC.
3. The wind tunnel simulation test method for the dust collection capacity of the bucket wheel type stacker-reclaimer according to claim 1, wherein a plurality of bucket wheels (11) are uniformly arranged around the bucket wheel head model (1), each bucket wheel (11) is provided with a rectangular opening (111), and the depths of the rectangular openings (111) are the same.
4. The wind tunnel simulation test method for the dust collection capacity of the bucket wheel type stacker-reclaimer according to claim 1, wherein the outline of a prototype bucket wheel head simulated by the bucket wheel head model (1) follows a geometric similarity principle, and the geometric similarity ratio is λ.
5. The wind tunnel simulation test method for the dust collection amount of the bucket-wheel stacker-reclaimer, according to claim 1, is characterized in that the annual dust collection amount expected value of the bucket-wheel stacker-reclaimer in the bulk cargo port in the material taking dynamic operation process is evaluated according to the meteorological data wind speed and wind direction statistical data, the field water content condition and the operation time of the wind tunnel simulation test model device for the dust collection amount of the bucket-wheel stacker-reclaimer in the actual prototype and the simulation test result.
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