CN108387385B - High-precision measurement device and measurement method for performance parameters of dry type filtering dust remover - Google Patents
High-precision measurement device and measurement method for performance parameters of dry type filtering dust remover Download PDFInfo
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- CN108387385B CN108387385B CN201711434024.8A CN201711434024A CN108387385B CN 108387385 B CN108387385 B CN 108387385B CN 201711434024 A CN201711434024 A CN 201711434024A CN 108387385 B CN108387385 B CN 108387385B
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Abstract
The invention provides a high-precision measuring device and a measuring method for performance parameters of a dry type filtering dust remover, wherein the dust remover consists of a gas collecting hood, a current collector, a dust remover, a draw-out fan, an air inlet pipeline and an air outlet pipeline which are sequentially connected; the measuring mechanism comprises a leather supportThe device comprises a pipe, a dust collecting pipe, a micro-pressure meter, a processor, a powder feeder and a dust diffusion pipe; pitot tube N1、N2And dust collecting pipe Z1、Z2All mounted in the air inlet duct, an electrically controlled flow meter L1Respectively connected with an electric control flow valve K1、K3Connecting, electrically controlled flow meter L2Respectively connected with an electric control flow valve K2、K3Connected with a micro-pressure meter and an electric control flowmeter L respectively1And L2Connecting; the powder feeder is connected with the inlet end of the dust diffusion pipe through a pipeline; the dust diffusion pipe is arranged at the left opening end of the gas-collecting hood. The method comprises the following steps: calculating the air leakage rate; measuring performance parameters of the dust remover in the filtering stage; and measuring the performance parameters of the dust remover in the dust removing stage. The invention reduces the human error during measurement and can conveniently and accurately collect and process experimental data.
Description
Technical Field
The invention belongs to the technical field of dust remover performance detection equipment, and particularly relates to a high-precision measuring device and a measuring method for performance parameters of a dry type filtering dust remover.
Background
The dust removal efficiency of the dust remover is mostly measured by adopting a dust meter to measure the dust concentration at the front end and the rear end of the dust remover and then calculated, the existing dust meters are various, such as β ray dust meters, laser dust meters, infrared dust meters and other direct-reading dust meters, the dust meters can measure the dust concentration more conveniently, but the error is larger in the using process due to the limitation of the dust measuring principle, the weighing dust meters have more accurate test results in a small wind speed environment, but the wind speed is larger in the operating process of the dust remover, dust-containing gas is difficult to absorb into the dust meters, so that the measurement results of the weighing dust meters are inaccurate.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a high-precision measuring device for performance parameters of a dry type filtering dust remover, which can be used for rapidly detecting the dust removal efficiency and the air leakage rate of the dust remover, rapidly detecting the dust removal efficiency, the air leakage rate and the air outlet concentration of the dust remover during dust removal, accurately and rapidly providing the required performance parameters of the dust remover in real time, and has the advantages of difficult abrasion and long service life under the working conditions of high flow rate and high concentration.
In order to achieve the aim, the invention provides a high-precision measuring device for performance parameters of a dry type filtering dust remover, which comprises a dust removing device and a measuring mechanism, wherein the dust removing device is formed by sequentially connecting a gas collecting hood, a current collector, an air inlet pipeline, a dust remover, a draw-out fan and an air outlet pipeline;
the measuring mechanism comprises a pitot tube N1Pitot tube N2Dust collecting pipe Z1Dust collecting pipe Z2The device comprises a micro-pressure meter, a processor, a powder feeder and a dust diffusion tube;
the pitot tube N1 and the dust collecting tube Z1 are both arranged in the air inlet pipeline, and the pitot tube N1Measuring head and dust collecting tube Z1The dust inlet pipe openings are all vertical to the section of the air inlet pipeline and are arranged at the center of the air inlet pipeline in a way of facing the air flow direction; the pitot tube N2And dust collecting pipe Z2Are all installedIn the air outlet pipeline, and a pitot tube N2Measuring head and dust collecting tube Z2The dust inlet pipe openings are vertical to the section of the air outlet pipeline and are arranged at the center of the air outlet pipeline in a way of facing the direction of the air flow; the micro-pressure meter is respectively connected with a pitot tube N1And pitot tube N2Connecting;
the dust outlet pipe orifice of the dust collecting pipe Z1 is sequentially connected with a dust collector X in series1Electrically controlled flow meter L1And electric control flow valve K1One hose is connected with a negative pressure port of the vacuum pump; the dust outlet pipe orifice of the dust collecting pipe Z2 is sequentially connected with a dust collector X in series2Electrically controlled flow meter L2Electric control flow valve K2The other hose is connected with a negative pressure port of the vacuum pump; the negative pressure port of the vacuum pump is also connected with another electric control flow valve K3The hose of (1);
the electronically controlled flow meter L1Are respectively connected with an electric control flow valve K through leads1And K3Connection, the electrically controlled flow meter L2Are respectively connected with an electric control flow valve K through leads2And K3Connecting;
the processor is respectively connected with a micro-pressure meter and an electric control flowmeter L1And L2Connecting;
the powder feeder is connected with the inlet end of the dust diffusion pipe through a pipeline; the dust diffusion pipe is arranged at the left opening end of the gas collecting hood.
In the technical scheme, the electrically controlled flow meter L is used1、L2Electronic control flow valve K capable of realizing negative feedback regulation1、K2、K3Medium flow rate, processor control regulating electric control flow meter L1、L2The device can be used for accurately and quickly providing required performance parameters of the dust remover in real time, and is not easy to wear under the working conditions of high flow speed and high concentration, and the service life is long.
Further, in order to obtain the pressure difference inside the dust remover, a pressure difference meter is arranged in the dust remover; in order to facilitate the addition of dust, the inlet end of the dust diffusion pipe is also connected with a blower.
Further, to improve the accuracy of the acquired data, the pitot tube N1The air inlet end is close to the air inlet pipeline; the pitot tube N2The air outlet end is arranged close to the air outlet pipeline.
Furthermore, in order to improve the dust diffusion effect, the dust diffusion pipe is a disc-shaped annular pipeline, the dust diffusion pipe gradually decreases and circulates at intervals of 8-10cm from the outer diameter to the center according to the caliber of the gas collecting hood, the tail end of the pipeline of the dust diffusion pipe is of an open structure, the inlet end of the dust diffusion pipe is Y-shaped, two Y-shaped upper branches are arranged, one upper branch is connected with the air blower, and the other upper branch is connected with the powder feeder; the pipe wall of the dust diffusion pipe is provided with a plurality of round holes with the diameter of 1-1.2mm which are uniformly distributed in the length direction of the pipe wall at the leeward side, and the interval between the adjacent round holes is 1-2 mm.
The invention also provides a high-precision measurement method for the performance parameters of the dry type filtering dust remover, which has the advantages of simple steps and accurate detection result, can quickly and accurately detect the dust removal efficiency and the air leakage rate of the dust remover, and can also detect the dust removal efficiency, the air leakage rate and the air outlet concentration of the dust remover during dust removal, thereby being capable of quickly providing the required performance parameters of the dust remover.
In order to achieve the above object, the present invention further provides a method for high-precision measurement of performance parameters of a dry type filter dust collector, comprising the steps of:
s1, calculating the air leakage rate, which comprises the following steps:
the method comprises the following steps: after the dust remover is subjected to thorough dust removal treatment, the dust remover is started, the powder feeder and the vacuum pump are in a closed state, and the micro-pressure meter and the processor are started after the dust remover operates stably; putting a pitot tube N1The pipe orifice is arranged at the center of the cross section of the air inlet pipeline and faces the direction of the air flow, and the micro-pressure meter passes through the pitot tube N1The measured relative static pressure delta P of the air inlet pipeline is transmitted to a processor in real time, and the processor calculates and displays the inlet air quantity q when no dust is added according to a formula (1)1：
In the formula (d)1The inner diameter of the air inlet pipeline;
t1the temperature of the air inlet pipeline is the temperature of the air inlet pipeline;
pa is the atmospheric pressure at the test site;
a, taking 0.96;
step two: putting a pitot tube N2The pipe orifice is arranged at the center of the cross section of the air outlet pipeline and faces the direction of the wind flow, and the micro-pressure meter passes through the pitot tube N2Measured dynamic pressure P at air outlet of pipelinedReal-time transmitting to a processor, calculating and displaying the outlet air quantity q without adding dust by the processor according to a formula (2)2：
In the formula (d)2The inner diameter of the air outlet pipeline;
t2the temperature at the air outlet of the air outlet pipeline is measured;
step three: the processor calculates and displays by formula (3):
s2, measuring the performance parameters of the dust remover in the filtering stage, which comprises the following steps:
the method comprises the following steps: starting the dust remover, and starting the powder feeder and the electric control flow valve K simultaneously after the dust remover runs stably1～K3Electrically controlled flow meter L1And L2A vacuum pump and setting the operating time of the dust remover to t3The processor calculates and adjusts the electric control flowmeter L in real time through the formula (4)1Flow rate q in (1)1' to realize a dust collecting pipe Z1The internal wind speed is equal to the wind speed in the air inlet pipeline, and at the same time, the electric control flowmeter L2Medium flow q2' and electric control flowMeter L1The adjustment is performed in the same way and simultaneously by the processor:
in the formula: d is a dust collecting pipe Z1The inner diameter of the pipe orifice;
qtthe air quantity in the air inlet pipeline at a certain moment t;
s is a dust collecting pipe Z1The cross-sectional area of the orifice;
s1is the cross section area of the air inlet pipeline;
step two: at operation t3After the time is up, the powder feeder, the dust remover, the vacuum pump and the electric control flow valve K are closed simultaneously1～K3Electrically controlled flow meter L1And L2The processor calculates the average flow q according to equation (5):
in the formula:
is t3Average value of wind speed recorded by the processor in time;
step three: the processor calculates the dust concentration c according to the formula (6)i：
In the formula: i takes 1 and 2;
m11for a dust collector X1The mass of the hollow white filter paper;
m21for a dust collector X2The mass of the hollow white filter paper;
m12is passing through t3Dust collector X after time1The mass of the filter paper in (1);
m22is passing through t3Dust collector X after time2The mass of the filter paper in (1);
step four, the processor calculates and displays the total dust removal efficiency η of the dust remover in the filtering stage according to the formula (7):
in the formula: c. C1The dust concentration in the air inlet pipeline at the front end of the dust remover;
c2the dust concentration in an air outlet pipeline at the rear end of the dust remover;
s3: the method for measuring the performance parameters of the dust remover in the dust removing stage specifically comprises the following steps:
the method comprises the following steps: replacing the dust collector X1And X2The filter paper in the filter paper starts the dust remover, and after the dust remover operates stably, the powder feeder and the electric control flow valve K are started simultaneously1～K3Electrically controlled flow meter L1And L2The method comprises the steps of setting the operation time of a dust remover to be 0.15n +30n by a vacuum pump, wherein n is the total row number of filter cylinders of the dust remover, carrying out dust cleaning operation on the dust remover within T time until the dust cleaning of the filter cylinders of n rows is finished, and adjusting an electrically controlled flowmeter L according to the method in the step S2 in the operation process1Flow rate q in (1)1' to realize the dust collecting pipe Z1The internal wind speed is equal to the wind speed in the air inlet pipeline, and the electric control flowmeter L is adjusted2Flow rate q in (1)2' to realize the dust collecting pipe Z2The internal wind speed is equal to the wind speed in the air outlet pipeline; after T time, the powder feeder, the dust remover and the electric control flow valve K are closed simultaneously1～K3Electrically controlled flow meter L1And L2(ii) a The processor calculates the average flow q' at this stage by the method of step S2, and calculates the dust concentration c at the outlet of the dust collector by the formula (8)i：
In the formula: i, taking 3 and 4;
c3the dust concentration in the air inlet pipeline at the front end of the dust remover;
c4is the rear end of a dust removerThe dust concentration in the air outlet pipeline;
m31for the newly-replaced dust collector X1The mass of the hollow white filter paper;
m41for the newly-replaced dust collector X2The mass of the hollow white filter paper;
m32is a dust collector X after T time1The mass of the filter paper in (1);
m42is a dust collector X after T time2The mass of the filter paper in (1);
step two: the processor calculates and displays the total dust removal efficiency of the dust remover in the dust removal stage according to the formula (9):
step three: the processor calculates and displays the dust concentration of the pulse blowing part of the dust remover according to the formulas (10) and (11):
c6≈c2(11)
in the formula: c. C5The dust concentration in the air outlet pipeline of the pulse blowing part of the dust remover is measured;
c6the dust concentration in the air outlet pipeline of the interval part of the pulse blowing of the dust remover is measured;
step four: the processor calculates and displays the total dust removal efficiency of the pulse injection part of the dust remover according to the formula (12):
further, the dust collecting pipe Z is kept in the operation process of S21The inner wind speed is equal to the inner wind speed of the air inlet pipeline.
Further, in the first step in S3, the pulse blowing width of the dust collector is set to 0.15S, and the pulse blowing time interval is set to 30S.
The invention automatically measures the required parameters through the electric control type flowmeter and the flow valve, and constantly keeps the wind speed at the pipe orifice of the dust collecting pipe equal to the wind speed in the air inlet pipeline and the air outlet pipeline under the control of the processor, thereby effectively reducing the human error during measurement; in addition, the processor can be used for conveniently and rapidly collecting and processing experimental data; meanwhile, the problem that the traditional mode cannot measure the ash removal stage is solved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view showing the structure of a dust diffusion tube according to the present invention;
FIG. 3 is a schematic structural view of the leeward side portion of the dust diffusing pipe of the present invention;
fig. 4 is a flow chart of the present invention.
In the figure: 1. the device comprises a vacuum pump, 2, a powder feeder, 3, a dust diffusion pipe, 4, a gas collecting hood, 5, a current collector, 6, an air inlet pipeline, 7, a micro-pressure meter, 8, a dust remover, 9, a processor, 10, a draw-out fan, 12, a differential pressure gauge, 13, a hose, 14, a lead, 15, a round hole, 16, a blower, 17 and a pitot tube N 118 pitot tube N 219 dust collecting tube Z120, dust collecting tube Z 221, electrically controlled flow meter L 122, electrically controlled flow meter L2Electric control flow valve K 124, electric control flow valve K 225, electric control flow valve K 326, dust collector X 127, dust collector X2。
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1, a high-precision measuring device for performance parameters of a dry type filtering dust collector comprises a dust collecting device and a measuring mechanism, wherein the dust collecting device is formed by sequentially connecting a gas collecting hood 4, a current collector 5, an air inlet pipeline 6, a dust collector 8, a draw-out fan 10 and an air outlet pipeline 11; the left end of the air inlet pipeline 6 is connected with the gas collecting hood 4, and the right end of the air inlet pipeline is connected with the inlet end of the dust remover 8; the outlet end of the dust remover 8 is connected with the air inlet end of an air outlet pipeline 11 through a draw-out fan 10; the collector 5 is arranged inside the left end of the air inlet pipeline 6;
the measuring mechanism comprises a pitot tube N 117. Pitot tube N 218. Dust collecting pipe Z 119. Dust collecting pipe Z220. A micro-pressure meter 7, a processor 9, a powder feeder 2 and a dust diffusion pipe 3;
the pitot tube N 117 and a dust collecting tube Z 119 are all arranged in the air inlet pipeline 6, and a pitot tube N 117 measuring head and dust collecting tube Z1The dust inlet pipe openings of the dust inlet pipes 19 are all vertical to the section of the air inlet pipe 6 and are arranged at the center of the air inlet pipe 6 opposite to the air flow direction; the pitot tube N 218 and a dust collecting tube Z220 are all installed in the air outlet pipeline 11, and a pitot tube N 218 measuring head and dust collecting tube Z2The dust inlet pipe openings of the dust collector 20 are vertical to the section of the air outlet pipeline 11 and are arranged at the center of the air outlet pipeline 11 opposite to the air flow direction; the micro-pressure meter 7 is respectively connected with a pitot tube N 117 and Pitot tube N 218 connection;
the dust collecting pipe Z 119 dust outlet pipe openings are sequentially connected with a dust collector X in series 126. Electrically controlled flow meter L 121 and an electrically controlled flow valve K 123, one hose 13 is connected with a negative pressure port of the vacuum pump 1; the dust collecting pipe Z220 dust outlet pipe openings are sequentially connected with a dust collector X in series 227. Electrically controlled flow meter L 222. Electric control flow valve K2The other hose 13 of the 24 is connected with a negative pressure port of the vacuum pump 1; the negative pressure port of the vacuum pump 1 is also connected with another electric control flow valve K 325 hose 13 with electrically controlled flow valve K3The hose 13 of the 25 is used for adjusting the suction volume of the negative pressure port of the vacuum pump 1, and further can adjust the electric control flow valve K 325 to regulate the electrically controlled flow valve K1Hose 13 and electric control flow valve K with 23224, and thus can help to more accurately acquire measurement data.
The electronically controlled flow meter L 121 are respectively connected with an electric control flow valve K through leads 141And K3Connection, the electrically controlled flow meter L 222 are respectively connected with an electrically controlled flow valve K through leads 142And K3Connecting; what is needed isThe electrically controlled flow meter L1、L2Electronic control flow valve K capable of realizing negative feedback regulation1、K2、K3The flow rate of (1);
the processor 9 is respectively connected with the micro-pressure gauge 7 and the electric control flow meter L1And L2Connected with each other, the processor 9 is used for controlling and regulating the electrically controlled flow meter L1、L2And processes the data transmitted by the micro-manometer 7;
the powder feeder 2 is connected with the inlet end of the dust diffusion pipe 3 through a pipeline; the dust diffusion pipe 3 is arranged at the left opening end of the gas collecting hood 4. As shown in fig. 1 to 3, the inlet end of the dust diffusion pipe 3 is further connected with a blower 16, the dust diffusion pipe 3 is a circular disc-shaped pipeline, the dust diffusion pipe 3 is gradually and progressively decreased from the outer diameter to the center at intervals of 8-10cm according to the caliber of the gas collecting hood 4, the tail end of the pipeline of the dust diffusion pipe 3 is of an open structure, the inlet end of the dust diffusion pipe 3 is of a Y-shaped, two upper branches of the Y-shaped, one of the upper branches is connected with the blower 16, and the other upper branch is connected with the powder feeder 2; the pipe wall of the dust diffusion pipe 3 is provided with a plurality of round holes 15 with the diameter of 1-1.2mm uniformly distributed in the length direction of the pipe wall at the leeward side, and the interval between adjacent round holes 15 is 1-2 mm. When dust enters the pipeline, the blower 16 blows air to drive the dust to move in the dust diffusion pipe 3, the dust in the dust-containing gas leaks out from the circular hole 15 when moving, preferably, the inner diameter of the pipeline of the dust diffusion pipe 3 is 1-2cm, and the wall thickness of the pipeline is 1-2 mm. The dust diffusion pipe 3 is used for uniformly distributing a fixed amount of dust given by the powder feeder 2 in the air inlet pipeline 6.
A pressure difference meter 12 is arranged in the dust remover 8.
As shown in fig. 4, the present invention also provides a method for measuring the performance parameters of a dry filter dust collector with high precision, which comprises the following steps:
s1, calculating the air leakage rate, which comprises the following steps:
the method comprises the following steps: after the dust remover 8 is completely cleaned, the dust remover is openedThe dust remover 8 simultaneously enables the powder feeder (2) and the vacuum pump 1 to be in a closed state, and the micro-pressure meter 7 and the processor 9 are started after the dust remover 8 stably runs; putting a pitot tube N 117 the orifice is arranged at the center of the cross section of the air inlet pipeline 6 and is opposite to the direction of the air flow, and the micro-manometer 7 passes through a pitot tube N 117 the relative static pressure delta P (unit is Pa) of the air inlet pipeline 6 is measured and transmitted to the processor 9 in real time, and the processor 9 calculates and displays the inlet air quantity q without adding dust through the formula (1)1(unit is m)3/min)：
In the formula (d)1Is the inner diameter of the air inlet pipeline (6) with the unit of m, can be obtained by manual measurement and is manually input into the processor 9;
t1the temperature of the air inlet pipeline (6) is measured manually or obtained by an electronic thermometer and is manually input into the processor 9;
pa is the atmospheric pressure at the test site in Pa, which can be obtained by manual measurement and manually entered into the processor 9;
a, taking 0.96;
step two: putting a pitot tube N2The orifice 18 is arranged at the center of the cross section of the air outlet pipeline 11 and is opposite to the direction of the wind flow, and the micro-manometer 7 passes through the pitot tube N2Measured dynamic pressure P at air outlet of pipelinedReal-time transmitting to processor 9, processor 9 calculating and displaying outlet air quantity q without adding dust by formula (2)2(unit is m)3/min)：
In the formula (d)2The inner diameter of the air outlet pipeline 11 is m, which can be obtained by manual measurement and is manually input into the processor 9;
t2the temperature of the air outlet pipeline 11 is measured in a unit of DEG C, and can be obtained by manual measurement or by passing throughObtaining an electronic thermometer;
step three: the processor 9 calculates and displays by equation (3):
s2, measuring the performance parameters of the dust remover 8 in the filtering stage, which comprises the following steps:
the method comprises the following steps: starting the dust remover 8, and starting the powder feeder 2 and the electric control flow valve K simultaneously after the dust remover 8 runs stably1～K3Electrically controlled flow meter L1And L2Vacuum pump 1 and setting the operating time of dust separator 8 to t3(unit is s); t is t3The dust remover is started to operate until the actual operation resistance reaches the rated dust removal resistance, the rated dust removal resistance is determined by the factory parameters of the dust remover, and the actual operation resistance is determined by a pressure difference meter 12. Will run time t3The dust collecting pipe Z is input into the processor 9 and must be kept in the running process1The wind speed in the 19 wind inlet pipes is equal to the wind speed in the 6 wind inlet pipes and is vt(m/s) with the addition of dust, the static pressure of the measured air inlet pipeline 6 changes continuously, which causes the air speed in the air inlet pipeline 6 to change, so the processor 9 is required to adjust the electric control flow meter L in real time1Flow rate q in 211' (unit is m)3Min) size, and then adjusting the dust collecting pipe Z1The wind speed changes within 19. Therefore, the air quantity q of the air inlet pipeline at a certain time tt(unit is m)3Min), the processor 9 calculates and adjusts the electrically controlled flow meter L in real time according to the formula (4)1Flow rate q in 211' to realize a dust collecting pipe Z 119 the wind speed is equal to the wind speed in the air inlet pipeline 6, and at the same time, the electric control flowmeter L2Flow q in 222' and electrically controlled flowmeter L 121 the adjustment is done in the same way and simultaneously by the processor 9:
in the formula: d is a dust collecting pipe Z 119 the inner diameter of the orifice, in m,it can be obtained by manual measurement;
qtthe air quantity in the air inlet pipeline 6 at a certain time t;
s is a dust collecting pipe Z 119 area of the cross section of the orifice in m2；
s1Is the cross section area of the air inlet pipeline 6 and has the unit of m2；
Step two: at operation t3After the time is up, the powder feeder 2, the dust remover 8, the vacuum pump 1 and the electric control flow valve K are closed simultaneously1～K3Electrically controlled flow meter L1And L2Processor 9 calculates the average flow q (in m) according to equation (5)3/min)：
In the formula:
(unit is m/s) is t3Average of wind speeds recorded by processor 9 over time:
step three: the processor 9 calculates the dust concentration c according to the formula (6)i：
In the formula: i takes 1 and 2;
m11for a dust collector X 126 the mass of the hollow white filter paper, in mg;
m21for a dust collector X 227 mass of hollow white filter paper in mg;
m12is passing through t3Dust collector X after time 126 mass of filter paper in mg;
m22is passing through t3Dust collector X after time2Mass of filter paper in 27 in mg;
step four, the processor 9 calculates and displays the total dust removal efficiency η of the dust remover in the filtering stage according to the formula (7):
in the formula: c. C1The dust concentration in the air inlet pipe 6 at the front end of the dust remover 8 is mg/m3；
c2Is the dust concentration in the air outlet pipeline 11 at the rear end of the dust remover 8 and has the unit of mg/m3；
S3: the method for measuring the performance parameters of the dust remover 8 in the dust removing stage specifically comprises the following steps:
the method comprises the following steps: replacing the dust collector X1And X2In the filter paper, the pulse injection width of the dust remover 8 is set to be 0.15s, the pulse injection time interval is set to be 30s, the dust remover 8 is started, and after the dust remover 8 operates stably, the powder feeder 2 and the electric control flow valve K are started simultaneously1～K3Electrically controlled flow meter L1And L2The method comprises the steps of setting the operation time of a dust remover to be 0.15n +30n by a vacuum pump 1, wherein n is the total row number of filter cylinders of the dust remover, carrying out ash removal operation on the dust remover 8 within T time until the ash removal of the filter cylinders of n rows is finished, and adjusting an electrically-controlled flow meter L according to the method in the step S2 in the operation process1Flow rate q in 211' to realize the dust collecting pipe Z1The wind speed in the 19 is equal to the wind speed in the air inlet pipeline 6, and the electrically controlled flowmeter L is adjusted2Flow rate q in 222' to realize the dust collecting pipe Z2The wind speed in 20 is equal to the wind speed in the air outlet pipeline 11; after T time, the powder feeder 2, the dust remover 8 and the electric control flow valve K are closed simultaneously1～K3Electrically controlled flow meter L1And L2(ii) a The processor 9 calculates the average flow rate q' (m) at this stage in accordance with the method of step S23Min) and calculating the dust concentration c at the outlet of the dust remover according to the formula (8)i(unit is mg/m)3)：
In the formula: i, taking 3 and 4;
c3in the air inlet pipeline 6 at the front end of the dust remover 8Dust concentration of (2) in mg/m3；
c4Is the dust concentration in the air outlet pipeline 11 at the rear end of the dust remover 8 and has the unit of mg/m3；
m31For the newly-replaced dust collector X 126 the mass of the hollow white filter paper, in mg, can be manually weighed, and then the measured data is input into the processor 9;
m41for the newly-replaced dust collector X 227 mass of hollow white filter paper in mg. May be manually weighed and then the measured data is input into the processor 9;
m32is a dust collector X after T time 126 the mass of the filter paper, in mg, may be manually weighed and the measured data then input to the processor 9;
m42is a dust collector X after T time2The mass of the filter paper in 27, in mg, may be manually weighed and the measured data then input to the processor 9;
step two: the processor (9) calculates and displays the total dust removal efficiency of the dust remover in the dust removal stage according to the formula (9):
step three: the dust separator 8 is divided into two parts in the ash removal stage: the dust remover pulse blowing part and the pulse blowing interval part, the processor 9 calculates and displays the dust concentration of the dust remover pulse blowing part according to the formulas (10) and (11):
c6≈c2(11)
in the formula: c. C5The dust concentration in the pulse blowing part of the air outlet pipeline 11 of the dust remover 8 is mg/m3；
c6The dust concentration in the air outlet pipeline 11 of the pulse blowing interval part of the dust remover 8 is measured in mg/m3；
Since the dust concentration in the pipeline after the pulse blowing interval part in the dust removing stage of the dust remover is approximately equal to the dust concentration in the pipeline after the filtering stage of the dust remover, the dust concentration in the pipeline is approximately equal to the dust concentration in the pipeline after the pulse blowing interval part in the dust removing stage of the dust remover, and therefore, the dust concentration in6≈c2。
Step three: the processor 9 calculates and displays the total dust removal efficiency of the pulse-blowing part of the dust remover 8 according to the formula (12):
Claims (5)
1. a high-precision measuring device for performance parameters of a dry type filtering dust remover comprises a dust removing device and a measuring mechanism, and is characterized in that the dust removing device is formed by sequentially connecting a gas collecting hood (4), a current collector (5), an air inlet pipeline (6), a dust remover (8), a draw-out fan (10) and an air outlet pipeline (11);
the measuring mechanism comprises a pitot tube N1(17) Pitot tube N2(18) Dust collecting pipe Z1(19) Dust collecting pipe Z2(20) The device comprises a micro-pressure meter (7), a processor (9), a powder feeder (2) and a dust diffusion pipe (3);
the pitot tube N1(17) And dust collecting pipe Z1(19) Are all arranged in an air inlet pipeline (6) and are provided with pitot tubes N1(17) Measuring head and dust collecting tube Z1(19) The dust inlet pipe openings are all vertical to the section of the air inlet pipeline (6) and are arranged at the center of the air inlet pipeline (6) in a way of facing the air flow direction; the pitot tube N2(18) And dust collecting pipe Z2(20) Are all arranged in an air outlet pipeline (11) and are provided with pitot tubes N2(18) Measuring head and dust collecting tube Z2(20) The dust inlet pipe openings are vertical to the section of the air outlet pipeline (11) and are arranged at the center of the air outlet pipeline (11) opposite to the air flow direction; the micro-pressure meter (7) is respectively connected with a pitot tube N1(17) And pitot tube N2(18) Connecting;
the dust collecting pipe Z1(19) The dust outlet pipe mouth is connected with a dust collector X in series in sequence1(26) Electrically controlled flow meter L1(21) And electric control flow valve K1(23) One hose (13) is connected with a negative pressure port of the vacuum pump (1);the dust outlet pipe orifice of the dust collecting pipe Z2(20) is connected with a dust collector X in series in sequence2(27) Electrically controlled flow meter L2(22) Electric control flow valve K2(24) The other hose (13) is connected with a negative pressure port of the vacuum pump (1); the negative pressure port of the vacuum pump (1) is also connected with another electric control flow valve K3(25) The hose (13);
the electronically controlled flow meter L1(21) Are respectively connected with an electric control flow valve K through leads (14)1(23) And electric control flow valve K3(25) Connection, the electrically controlled flow meter L2(22) Are respectively connected with an electric control flow valve K through leads (14)2(24) And electric control flow valve K3(25) Connecting;
the processor (9) is respectively connected with the micro-pressure meter (7) and the electric control flow meter L1(21) And an electronically controlled flow meter L2(22) Connecting;
the powder feeder (2) is connected with the inlet end of the dust diffusion pipe (3) through a pipeline; the dust diffusion pipe (3) is arranged at the left opening end of the gas collecting hood (4);
the dust diffusion pipe (3) is a disc-shaped annular pipeline, the dust diffusion pipe (3) is gradually and circularly decreased at intervals of 8-10cm from the outer diameter to the center according to the caliber of the gas collecting hood (4), the tail end of the pipeline of the dust diffusion pipe (3) is of an open structure, the inlet end of the dust diffusion pipe (3) is Y-shaped, two Y-shaped upper branches are arranged, one upper branch is connected with the air blower (16), and the other upper branch is connected with the powder feeder (2); the pipe wall of the dust diffusion pipe (3) is provided with a plurality of round holes (15) which are uniformly distributed in the length direction and have the diameter of 1-1.2mm on the leeward side, and the interval between every two adjacent round holes (15) is 1-2 mm.
2. The dry filter dust collector performance parameter high-precision measuring device according to the claim 1, characterized in that a pressure difference meter (12) is arranged in the dust collector (8); the inlet end of the dust diffusion pipe (3) is also connected with a blower (16).
3. The dry filter dust collector performance parameter high precision measuring device according to claim 1 or 2, wherein the pitot tube N1(17) Close to the air inlet pipeThe air inlet end of the channel (6) is arranged; the pitot tube N2(18) Is arranged close to the air outlet end of the air outlet pipeline (11).
4. A high-precision measurement method for performance parameters of a dry type filtering dust collector is characterized by comprising the following steps:
s1: calculating the air leakage rate, specifically comprising the following steps:
the method comprises the following steps: after the dust remover (8) is subjected to thorough dust removal treatment, the dust remover (8) is started, the powder feeder (2) and the vacuum pump (1) are in a closed state, and the micro-pressure meter (7) and the processor (9) are started after the dust remover (8) stably operates; putting a pitot tube N1(17) The pipe orifice is arranged at the center of the cross section of the air inlet pipe (6) and is opposite to the direction of the air flow, and the micro-pressure meter (7) passes through the pitot tube N1(17) The measured relative static pressure delta P of the air inlet pipeline (6) is transmitted to the processor (9) in real time, and the processor (9) calculates and displays the inlet air quantity q without adding dust through the formula (1)1：
In the formula (d)1Is the inner diameter of the air inlet pipeline (6);
t1is the temperature at the air inlet of the air inlet pipeline (6);
pa is the atmospheric pressure at the test site;
a, taking 0.96;
step two: putting a pitot tube N2(18) The pipe orifice is arranged at the center of the cross section of the air outlet pipeline (11) and is opposite to the direction of the wind flow, and the micro-pressure meter (7) passes through the pitot tube N2(18) Measured dynamic pressure P at air outlet of pipelinedReal-time transmitting to a processor (9), calculating and displaying the outlet air quantity q when no dust is added by the processor (9) through a formula (2)2：
In the formula (d)2Is the inner diameter of the air outlet pipeline (11);
t2the temperature of the air outlet pipeline (11);
step three: the processor (9) calculates and displays by equation (3):
s2: measuring the performance parameters of the dust collector (8) in the filtration phase, comprising in particular the following steps:
the method comprises the following steps: the dust remover (8) is started, and after the dust remover (8) operates stably, the powder feeder (2) and the electric control flow valve K are started simultaneously1～K3Electrically controlled flow meter L1And L2A vacuum pump (1) and setting the operating time of the dust remover (8) to t3The processor (9) calculates and adjusts the electric control flowmeter L in real time through the formula (4)1(21) Flow rate q in (1)1' to realize a dust collecting pipe Z1(19) The internal wind speed is equal to the wind speed in the air inlet pipeline (6), and at the same time, the electric control flowmeter L2(22) Medium flow q2' and electrically controlled flowmeter L1(21) The adjustment is performed in the same way and simultaneously by the processor (9):
in the formula: d is a dust collecting pipe Z1(19) The inner diameter of the pipe orifice;
qtthe air quantity in the air inlet pipeline (6) at a certain moment t;
s is a dust collecting pipe Z1(19) The cross-sectional area of the orifice;
s1is the cross section area of the air inlet pipeline (6);
step two: at operation t3After the time is up, the powder feeder (2), the dust remover (8), the vacuum pump (1) and the electric control flow valve K are closed simultaneously1～K3Electrically controlled flow meter L1And L2The processor (9) calculates the average flow rate q according to equation (5):
in the formula:
is t3-average value of wind speed recorded by the processor (9) over time;
step three: the processor (9) calculates the dust concentration c according to the formula (6)i：
In the formula: i takes 1 and 2;
m11for a dust collector X1(26) The mass of the hollow white filter paper;
m21for a dust collector X2(27) The mass of the hollow white filter paper;
m12is passing through t3Dust collector X after time1(26) The mass of the filter paper in (1);
m22is passing through t3Dust collector X after time2(27) The mass of the filter paper in (1);
step four, the processor (9) calculates and displays the total dust removal efficiency η of the dust remover in the filtering stage according to the formula (7):
in the formula: c. C1The dust concentration in the air inlet pipeline (6) at the front end of the dust remover (8);
c2the dust concentration in an air outlet pipeline (11) at the rear end of the dust remover (8);
s3: the method for measuring the performance parameters of the dust remover (8) in the dust removing stage specifically comprises the following steps:
the method comprises the following steps: replacing the dust collector X1And X2The filter paper in the device starts the dust remover (8), and after the dust remover (8) operates stably, the powder feeder (2) and the electric control flow valve K are started simultaneously1～K3Electrically controlled flow meter L1And L2A vacuum pump (1) is arranged in parallelThe method comprises the steps of setting the running time of a dust remover to be 0.15n +30n, wherein n is the total row number of filter cylinders of the dust remover, carrying out ash removal operation on the dust remover (8) within T time until the ash removal of the n rows of filter cylinders is finished, and adjusting an electrically controlled flowmeter L according to the method in the step S2 in the running process1(21) Flow rate q in (1)1' to realize the dust collecting pipe Z1(19) The internal wind speed is equal to the wind speed in the air inlet pipeline (6), and the electric control flowmeter L is adjusted2(22) Flow rate q in (1)2' to realize the dust collecting pipe Z2(20) The internal wind speed is equal to the wind speed in the air outlet pipeline (11); after T time, the powder feeder (2), the dust remover (8) and the electric control flow valve K are closed simultaneously1～K3Electrically controlled flow meter L1And L2(ii) a The processor (9) calculates the average flow q' at this stage by the method of step S2, and calculates the dust concentration c at the outlet of the dust collector by the formula (8)i：
In the formula: i, taking 3 and 4;
c3the dust concentration in the air inlet pipeline (6) at the front end of the dust remover (8);
c4the dust concentration in an air outlet pipeline (11) at the rear end of the dust remover (8);
m31for the newly-replaced dust collector X1(26) The mass of the hollow white filter paper;
m41for the newly-replaced dust collector X2(27) The mass of the hollow white filter paper;
m32is a dust collector X after T time1(26) The mass of the filter paper in (1);
m42is a dust collector X after T time2(27) The mass of the filter paper in (1);
step two: the processor (9) calculates and displays the total dust removal efficiency of the dust remover in the dust removal stage according to the formula (9):
step three: the processor (9) calculates and displays the dust concentration of the pulse-blowing part of the dust remover according to the formulas (10) and (11):
c6≈c2(11)
in the formula: c. C5The dust concentration in the air outlet pipeline (11) of the pulse blowing part of the dust remover (8) is measured;
c6the dust concentration in the air outlet pipeline (11) of the interval part is subjected to pulse spraying of the dust remover (8);
step four: the processor (9) calculates and displays the total dust removal efficiency of the pulse blowing part of the dust remover (8) according to the formula (12):
5. the method for high-precision measurement of performance parameters of a dry filter dust collector as claimed in claim 4, wherein the step one in S3 is implemented by setting the pulse blowing width of the dust collector (8) to 0.15S and the pulse blowing time interval to 30S.
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