CN110595983B - Ash removal test system and method for row-blowing bag type dust collector - Google Patents
Ash removal test system and method for row-blowing bag type dust collector Download PDFInfo
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- CN110595983B CN110595983B CN201910988682.4A CN201910988682A CN110595983B CN 110595983 B CN110595983 B CN 110595983B CN 201910988682 A CN201910988682 A CN 201910988682A CN 110595983 B CN110595983 B CN 110595983B
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- 238000007664 blowing Methods 0.000 title claims abstract description 220
- 238000012360 testing method Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims description 24
- 239000000428 dust Substances 0.000 title abstract description 63
- 238000001514 detection method Methods 0.000 claims abstract description 55
- 238000004088 simulation Methods 0.000 claims abstract description 26
- 238000006073 displacement reaction Methods 0.000 claims abstract description 22
- 238000009423 ventilation Methods 0.000 claims abstract description 12
- 238000010998 test method Methods 0.000 claims abstract description 9
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 description 14
- 230000008859 change Effects 0.000 description 7
- 238000005259 measurement Methods 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 239000004744 fabric Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/04—Cleaning filters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/66—Regeneration of the filtering material or filter elements inside the filter
- B01D46/70—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter
- B01D46/71—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter with pressurised gas, e.g. pulsed air
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N2015/084—Testing filters
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- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
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- Dispersion Chemistry (AREA)
- Measuring Volume Flow (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention provides a dust cleaning test system and a dust cleaning test method for a row-blowing bag type dust collector, which are used for testing the dust cleaning performance of the row-blowing bag type dust collector with a jet unit and a ventilation unit, wherein the jet unit is used for providing jet air flow and comprises a pulse valve, the ventilation unit comprises a jet pipe communicated with the pulse valve and a plurality of jet nozzles, and the test system has the characteristics that: a plurality of first detection units arranged on the blowing pipe and corresponding to each blowing port respectively, wherein each first detection unit is provided with a first pressure sensor and an energy detector; and a filter bag simulation unit which is communicated with the blowing port to simulate a filter bag, wherein the energy detector comprises a guide pipe, a moving part which is arranged in the guide pipe and is used for moving along the length direction of the guide pipe under the pushing of the blowing air flow, an infrared displacement sensor which is used for detecting the moving distance of the moving part, and a second pressure sensor which is used for detecting the pressure in the guide pipe.
Description
Technical Field
The invention belongs to the field of row-blowing bag type dust collectors, and particularly relates to a ash removal test system and a ash removal test method for a row-blowing bag type dust collector.
Background
The row-blowing bag type dust collector is a dust collecting device with filter bags arranged in rows and used for filtering and collecting dust by utilizing the filtering characteristics of the filter bags. The ash removing system is one of important components of the bag type dust collector, when the filter material filter bag collects dust for a certain time or differential pressure, the system sends out pulse signals to enable the electromagnetic pulse valve to work, compressed gas in the air bag enters the filter bag at a high speed through the blowing pipe and the blowing port because of the quick opening and closing of the electromagnetic pulse valve and is brought into a large amount of secondary drainage gas, and after the filter bag is subjected to the action of gas with certain energy, attached dust falls off and is settled to an ash bucket, so that the ash removing effect is achieved. The factors determining the ash removing effect are many, such as the filtering wind speed, the cloth bag specification, the ash removing mechanism, the ash removing pressure, the ash removing air quantity, the ash removing time, the ash removing interval, the ash removing mode, the design of a blowing pipe, the selection of a pulse valve and the like.
Aiming at the blowing characteristics of the dust remover, the main parameters influencing the ash removal effect need to be researched, and the rules and principles of the main parameters need to be mastered; influence of different working conditions on the design of the ash removal system; after the filtering area is determined according to the working conditions, how to determine the specification, the length and the number of the filter bags; how many cloth bags a single pulse valve can carry; how the openings of the blowing pipe ensure the uniformity of the air flow; the blowing pressure is high to effectively clean ash and save energy; influence of the air bag on blowing; how the characteristic parameters of the pulse valve are tested. The problems are the same problems faced by the current domestic and foreign peers, and only the problems can be better developed in the bag type dust removal industry.
In the prior art, many users often design the ash removal system only according to the blowing amount provided by an electromagnetic pulse valve manufacturer, but the design requirement cannot be met after the users arrive at the site, namely because the whole system is related, the ash removal performance cannot be ensured by only one electromagnetic pulse valve, and the ideal effect can be achieved by the perfect matching of the whole system. The purpose of using blowing to remove ash is to obtain compressed air with a certain mass flow in the moment, and how to design an ash removal system, especially the selection of an electromagnetic pulse valve, the size of an air bag, the opening of a blowing pipe and the design selection of blowing pressure are very important.
In addition, in the ash removal unit of the row-blowing bag type dust collector, the compressed gas in the gas bag is generally set to be between 0.25 and 0.6MPa, the flow state of the gas with high pressure is naturally very disturbed when the gas passes through the pulse valve, and after the gas passes through the blowing pipe, the dynamic pressure and the static pressure of the gas flow are different at different positions due to the fact that the blowing pipe is axially provided with the blowing holes, so that the blowing flow which is re-split from the different blowing pipes definitely has non-uniformity. Therefore, how to adjust the size of the injection hole becomes the difficulty and the key point of the design of the ash removal unit, and only the gas injected by each injection hole and the energy of the gas brought by the gas into secondary drainage are uniform, the equal impulse of ash removal of each cloth bag can be ensured.
To the above-mentioned problem, in prior art, the ash removal test system of the dust remover is generally used for testing different pulse injections, analyzing the uniformity of the pulse injections, summarizing the rule of the pulse injections, further adjusting the openings to achieve the effect of uniform gas, and then applying the proper setting parameters summarized according to the ash removal test system of the dust remover to the actual line injection bag type dust remover, thereby realizing the good dust removal effect.
However, the conventional ash removal test system for the dust remover only focuses on the pressure value and the variation of the blown compressed gas in the whole system, so the following problems exist: 1. the numerical value and the change of the blowing energy which determine the key parameter of ash removal cannot be detected; 2. the magnitude of the secondary drainage cannot be detected; 3. the influence of the air permeability of the filter bag on ash removal cannot be detected.
In addition, in the traditional dust remover ash removal test system, a filter bag is directly used as a tested body for testing, the air permeability of the filter bag is inconsistent with the actual site, a pressure sensor is only arranged on a rigid bag cage for supporting the inside of the filter bag for measuring the pressure change of the injected air, or a reverse accelerometer is arranged on the filter bag for measuring the acceleration formed by the movement of the filter bag, the measurement of the parameters is influenced by the tested body, if the air permeability and the wall thickness of the tested body are different in numerical value, and the repeatability of the whole test process is poor.
In addition, the traditional dust remover ash removal test system cannot accurately measure the blowing-up quantity of the pulse valve, generally calculates the quantity reduced after the compressed gas in the gas bag is blown out according to the pressure change value of the gas bag to be used as the blowing-up quantity of the pulse valve, and the value ignores the influence caused by the structure and the volume change of the gas bag and the influence caused by the value of the air leakage quantity of the structure of the pulse valve to the outside and the air quantity in the blowing pipe in the blowing process, so that the traditional measurement method measures the blowing-up quantity inaccurately, and the value is only an accumulated value, and cannot reflect the instantaneous flow and the change curve of the blowing-up quantity in the blowing-up process;
Disclosure of Invention
The invention aims to solve the problem that a dust remover ash removal testing system in the prior art cannot test the blowing energy of a dust remover, and provides a row blowing bag type dust remover ash removal testing system and a testing method.
The invention provides a ash cleaning test system of a row-blowing bag type dust collector, which is used for testing ash cleaning performance of the row-blowing bag type dust collector with an air injection unit and a ventilation unit, wherein the air injection unit is used for providing air injection flow and comprises an air source, an air bag and a pulse valve which are sequentially communicated, the ventilation unit comprises a blowing pipe communicated with an outlet of the pulse valve and a plurality of blowing openings arranged on the blowing pipe, and the ash cleaning test system has the characteristics that: a plurality of first detection units provided on the blowing pipe and corresponding to each of the blowing ports, respectively, each of the first detection units having a first pressure sensor for detecting a blowing pressure of the blowing port and an energy detector for detecting a blowing energy of the blowing port; and a filter bag simulation unit for communicating with the blowing port to simulate the filter bag, wherein the energy detector includes a guide tube, a moving member disposed in the guide tube for moving along a length direction of the guide tube under the pushing of the blowing air flow, an infrared displacement sensor for detecting a moving distance of the moving member, and a second pressure sensor for detecting a pressure in the guide tube.
The ash removal test system of the row-blowing bag type dust collector provided by the invention can also have the following characteristics: wherein the first pressure sensor is disposed at a 90 DEG position of the mouthpiece along the circumference of the lance, and the energy detector is disposed at a 180 DEG position of the mouthpiece along the circumference of the lance.
The ash removal test system of the row-blowing bag type dust collector provided by the invention can also have the following characteristics: the filter bag simulation unit comprises a tube body, a first detection subunit arranged on the tube body, a plurality of second detection subunits distributed along the length direction of the tube body and a third detection subunit arranged at the end part of the tube body, which is close to the end part, far away from the jetting port, of the tube body, wherein the first detection subunit comprises a mounting structure, a differential pressure sensor, an energy detector and a filter material, the differential pressure sensor, the energy detector and the filter material are arranged on the mounting structure, and the second detection subunit comprises a third pressure sensor and the energy detector.
The ash removal test system of the row-blowing bag type dust collector provided by the invention can also have the following characteristics: the third detection subunit comprises a shrinkage pipe structure, and a flowmeter and a multi-parameter transmitter which are arranged at the end part of the shrinkage pipe structure far away from the jetting port.
The ash removal test system of the row-blowing bag type dust collector provided by the invention can also have the following characteristics: the shrinkage tube angle of the shrinkage tube structure is 15-30 degrees, the shrinkage ratio is 0.5-0.9, and the flowmeter is a positive displacement flowmeter or an orifice plate flowmeter.
The ash removal test system of the row-blowing bag type dust collector provided by the invention can also have the characteristics that the ash removal test system further comprises: the pulse valve blowing amount testing unit comprises an orifice plate flowmeter and a multi-parameter transmitter which are arranged between an outlet of the pulse valve and the blowing pipe.
The invention provides a dust removal test method of a row-blowing bag type dust collector, which is used for testing the dust removal performance of the row-blowing bag type dust collector and has the characteristics that the method comprises the following steps: step one, compressed gas in a gas bag is sprayed into a blowing pipe through a pulse valve to form blowing air flow; step two, when the blowing air flow in the blowing pipe is introduced into the filter bag simulation unit through the blowing port, the first pressure sensor detects the blowing pressure of the corresponding blowing port, and the energy detector detects the blowing energy of the corresponding blowing port, wherein the process of detecting the blowing energy by the energy detector is as follows: the blowing air flows into the guide pipe to push the moving member to move, the second pressure sensor detects that the pressure in the guide pipe is P1, the infrared displacement sensor detects that the moving distance of the moving member is S1, then the blowing pressure F1=P1×A1 born by the moving member is calculated, A1 is the sectional area of the moving member, blowing energy is further calculated, and F2 is the moving resistance of the moving member measured in the process of pre-calibration.
The ash removal test method of the row-blowing bag type dust collector provided by the invention can also have the characteristics that the ash removal test method further comprises the following steps: and thirdly, after the compressed gas enters the filter bag simulation unit, the first detection subunit detects the differential pressure value at two sides of the simulation filter bag and the ventilation quantity of the simulation filter bag, the second detection subunits respectively detect the blowing air pressure and the blowing energy at different parts of the simulation filter bag, and the third detection subunit detects the energy and the air quantity of secondary drainage of blowing.
Effects and effects of the invention
According to the ash removal test system of the row-blown bag type dust collector, the ash removal test system comprises a plurality of first detection units, wherein the first detection units respectively correspond to each blowing port of the row-blown bag type dust collector and comprise an energy detector, the energy detector comprises a guide pipe, a moving member, an infrared displacement sensor and a second pressure sensor, when the row-blown bag type dust collector is used for blowing, blowing air flows into the guide pipe to push the moving member to move, the second pressure sensor can detect that the pressure in the guide pipe is P1, the infrared displacement sensor can detect that the moving distance of the moving member is S1, and then the blowing pressure F1=P1xA1 and A1 born by the moving member are calculated as the sectional area of the moving member, and further the blowing energy E= [ the (F1-F2) dt x S1 and F2 are the moving resistance of the moving member measured when the row-blown bag type dust collector is used for blowing, so that the ash removal test system of the row-blown bag type dust collector can detect the blowing energy of each blowing port.
In addition, the first detection unit further includes a first pressure sensor by which the blowing pressure of the nozzle can be detected.
Therefore, the ash removal test system of the row-blowing bag type dust collector can detect the blowing energy of each blowing port, can detect the blowing pressure of each blowing port, and further guide the adjustment of the diameter of the opening through the blowing energy and the blowing pressure, so that the gas distributed to each blowing port can be ensured to meet the requirement of the pressure value and the requirement of the ejection energy, the uniformity of blowing is realized, and the ash removal effect of the row-blowing bag type dust collector is improved.
According to the ash removal test method of the row-blowing bag type dust collector, in the second step, the first pressure sensor detects the blowing pressure of the corresponding blowing opening, the energy detector detects the blowing energy of the corresponding blowing opening, when the blowing energy is detected, the blowing air flows into the guide pipe so as to push the moving part to move, the second pressure sensor detects the pressure in the guide pipe as P1, the infrared displacement sensor detects the moving distance of the moving part as S1, the blowing pressure F1=P1×A1, A1 of the moving part is calculated as the sectional area of the moving part, and the blowing energy E= = + (F1-F2) dt×S1, F2 is calculated as the moving resistance of the moving part measured in advance, so that the blowing energy and the blowing pressure of each blowing opening can be detected by the method.
Drawings
FIG. 1 is a schematic diagram of a system for testing ash removal of a row-blown bag filter in an embodiment of the invention; and
Fig. 2 is a schematic diagram of the structure of an energy detector in an embodiment of the invention.
Detailed Description
In order to make the technical means, creation characteristics, achievement purposes and effects of the invention easy to understand, the following embodiments specifically describe the ash removal test system and the ash removal test method of the row-blown bag type dust collector in combination with the accompanying drawings.
Fig. 1 is a schematic structural diagram of a dust removal test system of a row-blown bag filter according to an embodiment of the present invention.
As shown in fig. 1, the ash removal test system 100 for a row-blown bag filter is used for testing ash removal performance of the row-blown bag filter 200, and includes a pulse valve blowing test unit 10, a plurality of first detection units 20, and a plurality of filter bag simulation units 30.
The traveling bag filter 200 includes an air injection unit and a ventilation unit.
The air injection unit is used for providing air injection flow and comprises an air source 1, an air bag 2 and a pulse valve 3 which are sequentially communicated, and further comprises a pressure gauge 4 arranged on the air bag 2. The pulse valve 3 is arranged on the air bag 2 and can be various types of pulse valves such as submerged type, right-angle type, straight-through type, right-angle belt nut type or right-angle flange type, and the like, and the specification is three-quarter inch to four-inch. The air bag 2 can be a container with a circular or rectangular cross section or a different shape, and the mounting mode is set according to the model specification of the pulse valve 3 so as to mount test pulse valves with different forms of specifications. The pressure gauge 4 has a field display and signal output function.
The ventilation unit includes a blowing pipe 5 communicating with the outlet of the pulse valve 3 and a plurality of blowing ports provided on the blowing pipe 5. The plurality of blowing openings are uniformly distributed on the blowing pipe 5. In the present embodiment, the number of the spouts is 3.
The pulse valve blow gas amount test unit 10 is disposed between the outlet of the pulse valve 3 and the blowing pipe 5, and includes a first orifice plate flowmeter 11 and a first multi-parameter transmitter 12. Because the injection process is short, the selected first multi-parameter transmitter 12 can output pulse, current (4-20 mA) and 485 signals, is provided with a temperature pressure sensor, automatically compensates temperature and pressure, has a measuring range ratio of 1:60 and an accuracy level of 0.5, and can display parameters such as temperature, pressure, working condition flow, standard condition flow, instantaneous flow, accumulated flow and the like.
A plurality of first detecting units 20 are provided on the blowing pipe 5 and correspond to each of the blowing ports, respectively, i.e., the number of first detecting units 20 is the same as the number of blowing ports. Each first detection unit 20 has a first pressure sensor and a first energy detector.
The first pressure sensor is provided at a 90 ° position of the mouthpiece in the circumferential direction of the lance tube 5 for detecting the blowing pressure of the mouthpiece.
The first energy detector is provided at a 180 ° position of the mouthpiece along the circumferential direction of the lance 5 for detecting the blowing energy of the mouthpiece.
Fig. 2 is a schematic diagram of the structure of an energy detector in an embodiment of the invention.
As shown in fig. 2, the first energy detector includes a guide tube 221, a mover 222, an infrared displacement sensor 223, a second pressure sensor 224, an intake end cover 225, a rear end cover 226, and a computing device. An intake end cap 225 and a rear end cap 226 are provided at both ends of the guide tube 221, respectively. The moving member 222 is provided in the guide pipe 221 and can move along the longitudinal direction of the guide pipe 221 by being pushed by the blowing air flow. The infrared displacement sensor 223 and the second pressure sensor 224 are both disposed on the rear end cap 226, the infrared displacement sensor 223 can detect the moving distance of the moving member 222, and the second pressure sensor 224 can detect the pressure in the guide tube. The rear end cap 226 is also provided with an exhaust hole adjustable mechanism which can adjust the size of the exhaust hole. The first energy detector further comprises a restoring element, for example a spring restoring element, by means of which the displacement element 222 is restored from the displacement position to the original position after the blowing has been completed.
The first energy detector is calibrated before use to measure the resistance F2 to movement of the moveable member 222. When the first energy detector works, the blown air flows into the guide pipe 221 to push the moving member 222 to move, the pressure sensor 26 can measure the pressure in the guide pipe 221 as P1, the infrared displacement sensor 23 can measure the moving distance S1 of the moving member 222, the P1 signal and the S1 signal are transmitted to a calculating device, which can be, for example, an algorithm, and the calculating device calculates the blown air pressure f1=p1×a1 of the blown air received by the moving member 222 according to the pressure P1 and the sectional area A1 of the moving member 222 (the area of the moving member 222 facing the air inlet end), and further calculates the blown air energy e= pi (F1-F2) dt×s1, that is, the work performed by the blown air pressure on the first energy detector. Work is a physical quantity that describes the process of changing the state of an object, and is a measure of the change in energy. Work is a process quantity. Work is done to change the energy of the object. The computing device may also display the calculated blowing energy E.
A plurality of filter bag simulation units 30 are respectively communicated with each of the blowing ports for simulating filter bags. The number of filter bag simulation units 30 is the same as the number of injection ports. Fig. 1 shows only one filter bag simulation unit 30. The filter bag simulation unit 30 includes a tube 31, a first detection subunit 32, a plurality of second detection subunits 33, and a third detection subunit 34.
The tube 31 is a circular or anisotropic cross-section structure made of rigid material, and the length of the tube can be set according to practical needs. The pipe body 31 is connected to and communicates with the mouthpiece.
The first detection subunit 32 includes a mounting structure 321, filter material 322, differential pressure sensor 323, and a second energy detector 324.
The mounting structure 321 may be mounted at different locations of the tube 31 as desired. In the present embodiment, the mounting structure 321 is mounted on the pipe body 31 at a position close to the mouthpiece. Filter material 322 is disposed on mounting structure 321. A differential pressure sensor 323 is provided on the mounting structure 321 for detecting a differential pressure value across the simulated filter bag. The second energy detector 324 is disposed on the mounting structure 321 and has the same structure as the first energy detector for detecting the air permeability of the analog filter bag per unit area.
The second detecting sub-units 33 are distributed along the length direction of the tube 31, and are used for detecting the values and changes of the blowing pressure and the blowing energy applied to different parts of the simulated filter bag. In the present embodiment, the number of the second detecting subunits 33 is 4, and one of the second detecting subunits 33 is disposed at the end of the tube 31 far from the blowing port for detecting the blowing pressure and the blowing energy value and the variation of the bottom of the simulated filter bag.
The second detection subunit 33 includes a second pressure sensor and a third energy detector. The third energy detector is installed horizontally while the second pressure sensor is installed correspondingly in its vertical direction. The second pressure sensor is used for detecting the blowing pressure of the corresponding part. The third energy detector has the same structure as the first energy detector and is used for detecting the blowing energy of the corresponding part.
The third detection subunit 34 is disposed on the tube body 31 and near a position of the tube body 31 that is away from the mouthpiece end. The third detection subunit 34 is provided in the present embodiment between the second detection subunit 33 at the end portion remote from the mouthpiece and the second detection subunit 33 nearest to the second detection subunit 33. The third sensing subunit 34 includes a shrink tubing arrangement, a flow meter 341, and a second multi-parameter transmitter 342.
The shrinkage tube structure is connected and communicated with the tube body 31, the shrinkage tube angle is 15-30 degrees, and the shrinkage ratio is 0.5-0.9. The gas flow rate increases after the gas is blown through the tubular structure so that the measurement can be satisfied against the lower limit measurement flow of the flow meter.
The flowmeter 341 and the second multi-parameter transmitter 342 are both arranged at the end part of the pipe shrinkage structure far away from the jetting port, so that the jetting gas with increased flow rate can be detected. Since the blowing air flow has short blowing time and intermittent pulse blowing, most flow meters cannot measure the flow after the blowing air enters the filter bag simulation unit 30 (filter bag), and therefore the flow meter 341 in this embodiment is a positive displacement flow meter or a differential pressure flow meter (orifice plate flow meter). Second multi-parameter transmitter 342 is identical in construction to first multi-parameter transmitter 12. The flow rates of the injected gas and the secondary drainage gas can be measured by the flow meter 341 and the second multi-parameter transmitter 342.
The embodiment also provides a method for testing the ash removal performance of the row-blown bag type dust collector 200 by the method and the system 100, the method comprises the following steps:
In the first step, compressed gas in the air bag 2 is sprayed into the blowing pipe 5 through the pulse valve 3 to form blowing air flow.
Step two, after the ejection of the ejection air flow, the pulse valve air-blowing amount detecting unit 10 detects the ejection air amount of the pulse valve 3.
And step three, the first pressure sensor detects the blowing pressure of the corresponding blowing port while the blowing air flow in the blowing pipe 5 is introduced into the filter bag simulation unit 30 through the blowing port, and the first energy detector detects the blowing energy of the corresponding blowing port.
The process of detecting the blowing energy by the first energy detector is as follows:
the blowing air flows into the guide pipe so as to push the moving part to move, the second pressure sensor detects that the pressure in the guide pipe is P1, the infrared displacement sensor detects that the moving distance of the moving part is S1, signals of P1 and S1 are transmitted to the calculating device, the calculating device calculates blowing pressure F1=P1×A1 born by the moving part, A1 is the sectional area of the moving part, blowing energy E= IV (F1-F2) dt×S1 is further calculated, F2 is the moving resistance of the moving part measured when the moving resistance is pre-calibrated, and then the calculated blowing energy E is displayed.
In step four, after compressed gas enters the filter bag simulation unit 30 through the blowing port, the first detection subunit 32 detects the differential pressure value at both sides of the simulated filter bag and the ventilation amount of the simulated filter bag in unit area, the plurality of second detection subunits 33 respectively detect the blowing air pressure and the blowing energy at different positions of the simulated filter bag (the detection process of the blowing energy is the same as that of the blowing energy in step three), and the third detection subunit 34 detects the energy and the air amount of the secondary drainage of the blowing.
The above steps are the test process of the ash removal test system 100 of the row-blown bag type dust collector 200 when the row-blown bag type dust collector 200 performs one-time blowing, and in actual use, the above test process is repeated, and the appropriate setting parameters are summarized according to the detection results of the multiple-time blowing test, so that the method is applied to the actual row-blown bag type dust collector to achieve a good dust removal effect.
Effects and effects of the examples
According to the ash removal test system of the row-blown bag type dust collector, the ash removal test system comprises a plurality of first detection units, wherein the plurality of first detection units respectively correspond to each blowing port of the row-blown bag type dust collector and comprise an energy detector, the energy detector comprises a guide pipe, a moving member, an infrared displacement sensor and a second pressure sensor, when the row-blown bag type dust collector is used for blowing, blowing air flows into the guide pipe to push the moving member to move, the second pressure sensor can detect that the pressure in the guide pipe is P1, the infrared displacement sensor can detect that the moving distance of the moving member is S1, and then the blowing pressure F1=P1×A1, A1 born by the moving member is the sectional area of the moving member, and further the blowing energy E= the (F1-F2) dt×S1, F2 is the moving resistance of the moving member measured when the row-blown bag type dust collector is used for blowing, so that the ash removal test system of the row-blown bag type dust collector can detect the blowing energy of each blowing port.
In addition, the first detection unit further includes a first pressure sensor by which the blowing pressure of the nozzle can be detected.
Therefore, the test system can detect the blowing energy of each blowing port and also detect the blowing pressure of each blowing port, and further guide the adjustment of the diameter of the opening through the blowing energy and the blowing pressure, so that the gas distributed to each blowing port can be ensured to meet the requirement of the pressure value and the blowing energy at the same time, the uniformity of blowing is realized, and the ash cleaning effect of the row-blowing bag type dust collector is improved.
Further, the ash removal test system of the row-blowing bag type dust collector further comprises a filter bag simulation unit, wherein the filter bag simulation unit comprises a pipe body, a first detection subunit, a plurality of second detection subunits and a third detection subunit, the first detection subunit comprises a mounting structure, a differential pressure sensor, an energy detector and a filter material, the differential pressure sensor, the energy detector and the filter material are arranged on the mounting structure, and the differential pressure value of the inner surface and the outer surface of the filter bag and the ventilation quantity of the filter bag in unit area can be detected through the first detection unit; the second detection subunits are distributed along the length direction of the tube body, and the values and changes of the blowing pressure and the blowing energy received by different parts of the filter bag can be detected through the second detection subunits; the third detection subunit comprises a shrinkage pipe structure, a flowmeter and a multi-parameter transmitter, and the gas speed of compressed gas (injection gas) is increased after the compressed gas passes through the shrinkage pipe structure, so that the flowmeter and the multi-parameter transmitter can measure the flow of the compressed gas and the secondary drainage gas. In addition, the measurement result obtained by the filter bag simulation unit eliminates the influence of factors of the air permeability, resistance, thickness and maximum deformation of the filter bag, only the fixed air quantity blown by the blowing pipe and various values of the secondary air quantity brought by the fixed air quantity are measured, and the values are not changed as long as the experimental scheme (namely the ash removal system design scheme) is determined, so that the numerical measurement is accurate and the repeatability is good.
Further, the test of the invention also comprises a pulse valve blowing gas test unit which comprises an orifice plate flowmeter and a multi-parameter transmitter which are arranged between the outlet of the pulse valve and the blowing pipe, and the pulse valve blowing gas test unit can accurately detect the blowing gas quantity of the pulse valve, in particular to accurately measure the instantaneous flow of the pulse valve in the blowing process.
According to the ash removal test method for the row-blowing bag type dust collector provided by the embodiment, because the first pressure sensor detects the blowing pressure of the corresponding blowing port in the second step, the energy detector detects the blowing energy of the corresponding blowing port, when the blowing energy is detected, the blowing energy flows into the guide pipe so as to push the moving member to move, the second pressure sensor detects the pressure in the guide pipe as P1, the infrared displacement sensor detects the moving distance of the moving member as S1, the blowing pressure F1=P1×A1 and A1 of the moving member are calculated as the sectional area of the moving member, and the blowing energy E= = Special (F1-F2) dt×S1 and F2 are calculated as the moving resistance of the moving member measured in advance, so that the blowing energy and the blowing pressure of each blowing port can be detected by the method.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.
Claims (8)
1. The utility model provides a row jetting bag collector deashing test system for to the deashing performance of row jetting bag collector that has jet unit and ventilation unit tests, jet unit is used for providing the jetting air current, including air supply, air pocket and the pulse valve that communicate in proper order, the ventilation unit include with the jetting pipe that the export of pulse valve is linked together and set up a plurality of jetting mouthfuls on the jetting pipe, its characterized in that includes:
A plurality of first detection units provided on the blowing pipe and corresponding to each of the blowing ports, respectively, each of the first detection units having a first pressure sensor for detecting a blowing pressure of the blowing port and an energy detector for detecting a blowing energy of the blowing port; and
A filter bag simulation unit for communicating with the injection port to simulate a filter bag,
The energy detector comprises a guide pipe, a moving part, an infrared displacement sensor and a second pressure sensor, wherein the moving part is arranged in the guide pipe and used for moving along the length direction of the guide pipe under the pushing of the blowing air flow, the infrared displacement sensor is used for detecting the moving distance of the moving part, and the second pressure sensor is used for detecting the pressure in the guide pipe.
2. The row-blown bag house ash removal test system of claim 1, wherein:
Wherein the first pressure sensor is arranged at a 90 DEG position of the blowing port along the circumferential direction of the blowing pipe,
The energy detector is disposed at a 180 DEG position of the mouthpiece along the circumferential direction of the lance tube.
3. The row-blown bag house ash removal test system of claim 1, wherein:
Wherein the filter bag simulation unit comprises a tube body, a first detection subunit arranged on the tube body, a plurality of second detection subunits distributed along the length direction of the tube body and a third detection subunit arranged at the end part of the tube body, which is close to the end part far away from the jetting port,
The first detection subunit comprises a mounting structure, a differential pressure sensor, an energy detector and a filter material which are arranged on the mounting structure,
The second detection subunit includes a third pressure sensor and an energy detector.
4. The row-blown bag house ash removal test system of claim 3, wherein:
The third detection subunit comprises a shrinkage pipe structure, and a flowmeter and a multi-parameter transmitter which are arranged at the end part of the shrinkage pipe structure far away from the jetting port.
5. The row-blown bag house ash removal test system of claim 4, wherein:
Wherein the shrinking angle of the shrinking tube structure is 15-30 degrees, the shrinking ratio is 0.5-0.9,
The flowmeter is a positive displacement flowmeter or an orifice plate flowmeter.
6. The row-blown baghouse ash removal test system of claim 1, further comprising:
The pulse valve blowing amount testing unit comprises an orifice plate flowmeter and a multi-parameter transmitter, wherein the orifice plate flowmeter and the multi-parameter transmitter are arranged between the outlet of the pulse valve and the blowing pipe.
7. A method for testing the ash removal performance of a row-blown bag filter by using the ash removal test system of the row-blown bag filter according to any one of claims 1 to 6, which is characterized by comprising the following steps:
Step one, compressed gas in a gas bag is sprayed into a blowing pipe through a pulse valve to form blowing air flow;
Step two, the first pressure sensor detects the blowing pressure of the corresponding blowing port while the blowing air flow in the blowing pipe is led into the filter bag simulation unit through the blowing port, the energy detector detects the blowing energy of the corresponding blowing port,
The process of detecting the blowing energy by the energy detector is as follows:
The blowing air flows into the guide pipe to push the moving member to move, the second pressure sensor detects that the pressure in the guide pipe is P1, the infrared displacement sensor detects that the moving distance of the moving member is S1, then the blowing pressure F1=P1×A1 born by the moving member is calculated, A1 is the sectional area of the moving member, and the blowing energy E= [ IV (F1-F2) dt×S1, F2 is the moving resistance of the moving member measured in advance.
8. The row-blown bag filter ash removal test method of claim 7, further comprising:
And thirdly, after the compressed gas enters the filter bag simulation unit, the first detection subunit detects the differential pressure value at two sides of the simulation filter bag and the ventilation quantity of the simulation filter bag, the second detection subunits respectively detect the blowing air pressure and the blowing energy at different positions of the simulation filter bag, and the third detection subunit detects the energy and the air quantity of the secondary drainage of the blowing.
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| CN113053072A (en) * | 2021-03-08 | 2021-06-29 | 浙江安防职业技术学院 | Pulse dust removal experiment gas bag operation safety monitoring system |
| CN115339907B (en) * | 2022-10-17 | 2023-02-14 | 江苏永道科技有限公司 | Intelligent mixed transportation system for powder materials |
| CN117582748B (en) * | 2024-01-18 | 2024-05-14 | 江苏宇梦环保科技有限公司 | Automatic ash removal control method for bag type dust collector |
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| CN109342301A (en) * | 2018-08-20 | 2019-02-15 | 中国纺织科学研究院有限公司 | Filter bag simulates aging equipment and simulation aging method |
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