CN209821022U - Ground calibration and measurement device of pulverized coal concentration measurement system - Google Patents
Ground calibration and measurement device of pulverized coal concentration measurement system Download PDFInfo
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- CN209821022U CN209821022U CN201822187850.3U CN201822187850U CN209821022U CN 209821022 U CN209821022 U CN 209821022U CN 201822187850 U CN201822187850 U CN 201822187850U CN 209821022 U CN209821022 U CN 209821022U
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Abstract
A ground calibration and measurement device of a pulverized coal concentration measurement system applies various hydromechanics testing technologies. The device is composed of: the device comprises a main body rectangular pipeline, a pulverized coal feeding device, an axial flow fan, a small-range high-precision pressure transmitter, a laser, a CCD camera, a pulverized coal concentration measuring system mounting table, a data acquisition computer, a pulverized coal concentration calibration device and a pulverized coal emptying device. The device can realize stepless speed change, can randomly adjust the concentration of the pulverized coal, and completely covers the flowing condition in an actual coal conveying pipeline in a simulation range; the device adopts the corner pressure loss measurement technology to replace the conventional flow velocity test technology, and solves the problem that the pulverized coal particles block a measurement gas path by the conventional speed measurement method; the device avoids the influence of sampling on the flow in the pipeline by additionally arranging the spray pipe on the sampling pipeline and utilizing the characteristic of the sonic spray pipe. The utility model discloses can simulate industry coal conveying pipe inside and flow, replace the industrial field test with the ground calibration test, greatly practice thrift economic cost under the prerequisite of assurance test simulation precision.
Description
Technical Field
The utility model relates to a buggy concentration measurement system ground calibration device has used multiple hydrodynamics test technique.
Background
At present, most of large and medium boilers of power generation enterprises adopt a pulverized coal combustion technology, and the combustion efficiency of a combustor and the composition of combustion products depend on the concentration of pulverized coal in a mixture. The scientific pulverized coal flow rate and pulverized coal concentration have great significance for high-efficiency, low-nitrogen and safe combustion of the boiler. Since the last 90 s, many research institutions and industrial organizations both at home and abroad try to develop a boiler pulverized coal concentration measuring system capable of being applied commercially, a plurality of pulverized coal concentration measuring technologies appear, and a large number of early-stage simulation tests are required to put the measuring technologies and products into application in consideration of severe working conditions of industrial fields. However, it is not practical for a power generation enterprise's boiler tubes to operate substantially all the year round, with extensive testing at the industrial site. The ground calibration and measurement device adopting the pulverized coal concentration measurement system is a practical solution and accords with economic benefits.
The ground calibration and measurement device of the coal powder concentration measurement system can simulate the flowing condition in an actual coal conveying pipeline and can accurately calibrate the flow speed and the coal powder concentration in the pipeline. The traditional flow rate monitoring method is to measure by using a pitot tube or a probe, but the pitot tube or the probe is blocked by mixing a large amount of coal powder in the airflow. The traditional coal powder concentration calibration method adopts a sampling measurement method that a sampler is directly inserted into a coal powder conveying pipeline, coal powder flowing into the sampler is collected within a certain time, and then the coal powder is taken out and weighed, so that the concentration of the coal powder is calculated.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough of prior art, provide a buggy concentration measurement system ground calibration device, under the prerequisite that can the mobile condition in the actual pipeline of accurate simulation, avoided the buggy to block up the measurement gas circuit promptly, the velocity of flow and buggy concentration in the marking pipeline that again can be accurate.
The utility model discloses a solution is: a ground calibration device of a pulverized coal concentration measurement system comprises: the device comprises a main body rectangular pipeline (1), a pulverized coal feeding device (2), an axial flow fan (3), a small-range high-precision pressure transmitter (4), a laser (5), a CCD camera (6), a pulverized coal concentration measuring system mounting table (7), a data acquisition computer (8), a pulverized coal concentration calibration device (9) and a pulverized coal emptying device (10).
The pulverized coal feeding device (2) is arranged at the upstream of the axial flow fan (3), the fan blades of the axial flow fan (3) are arranged in the main body rectangular pipe (1), and the driving motors of the fan blades are arranged outside the main body rectangular pipe (1); the small-range high-precision pressure transmitter (4) is arranged at one corner of the main body rectangular pipe (1) and is positioned at the downstream of the axial flow fan (3), two pressure measuring holes are formed in the corner, and the small-range high-precision pressure transmitter (4) measures local static pressure in the pressure measuring holes through the pressure measuring holes and transmits the local static pressure to the data acquisition computer (8);
the laser device (5) is arranged on the side face of the main body rectangular pipe (1), the CCD camera (6) is arranged at the downstream of the pressure measuring hole, the data acquisition computer (8) controls the laser device (5) to generate laser, the output optical axis of the laser device (5) penetrates through the main body rectangular pipe (1), the data acquisition computer (8) controls the CCD camera (6) to acquire images of the laser which is output by the laser device (5) and enters the main body rectangular pipe (1), and the acquired images are transmitted back to the data acquisition computer (8);
the coal powder concentration measuring system mounting platform (7) is mounted on the main body square pipe (1) and serves as a mounting platform for a product to be calibrated;
the pulverized coal concentration calibration device (9) is movably arranged on the main body square pipe (1) to calibrate the pulverized coal concentration in the main body square pipe (1);
the coal dust emptying device (10) is arranged on the main body square-shaped pipeline (1), is a hole which can be opened and closed and is used for emptying the coal dust in the main body square-shaped pipeline (1).
The main body square-shaped pipeline (1) is a hollow closed pipeline, and a mixture of coal powder and air flows anticlockwise in the main body square-shaped pipeline (1).
The feeding port of the coal powder feeding device (2) is communicated with the main body square-shaped pipeline (1), and the feeding port can be opened and closed.
The small-range high-precision pressure transmitter (4) has a range of-1000 to 1000 pa.
The main body of the square-shaped pipeline (1) is a square-shaped pipeline formed by connecting transparent organic glass pipes and used for simulating a pulverized coal conveying pipeline, and meanwhile, the pipeline is transparent and convenient for observation and optical monitoring;
the output energy of the laser (5) is 80-180 mw.
A product under test comprising: a system for measuring the concentration of the pulverized coal by a friction balance, a system for measuring the concentration of the pulverized coal by an electrostatic method and the like.
The main body pipe (1) comprises: the coal powder mixing device comprises a power section (11), a coal powder mixing section (12), a test section (13) and 4 corners, wherein the 4 corners are a corner (I), a corner (II), a corner (III) and a corner (III) respectively; the corner (I), the corner (II), the corner (III) and the corner (IV) are arranged anticlockwise in sequence; the pipeline between the corner (I) and the corner (II) is a power section (11), the pipeline between the corner (I) and the corner (II) and the pipeline between the corner (II) and the corner (III) is a pulverized coal mixing section (12), and the pipeline between the corner (III) and the corner (II) is a test section (13).
The pulverized coal feeding device (2) is located at the upper stream of the axial flow fan (3), pulverized coal is more uniformly distributed in the pipeline through mixing of the axial flow fan (3), the axial flow fan (3) is connected with the frequency converter, the rotating speed of the axial flow fan is stepless and adjustable, and different flowing speeds can be simulated.
Two ends of the small-range high-precision pressure transmitter (4) are respectively connected to pipe walls at the corner inlet and the corner outlet to measure local static pressure, the corner is the corner at the upstream of the test section, dynamic pressure loss at the corner is obtained, and the flow velocity in the pipeline at the test section is obtained.
Pulverized coal concentration calibration device (9), its main part is a sealed cavity drum (91), an end face of drum is the roof, there are 3 interfaces (92, 93, 94) on the roof, interface (92) connect the manometer and are used for monitoring pulverized coal concentration calibration device (9) internal pressure, interface (93) connect the vacuum pump, be used for evacuation in cavity drum (91), connect a sample return bend (96) again behind interface (94) connect a spray tube (95), extract the buggy in sample return bend (96) stretch into main part form return pipe (1), through spray tube (95), send to in cavity drum (91).
Compared with the prior art, the utility model beneficial effect be:
(1) the utility model discloses a buggy concentration measurement system ground calibration device can simulate the mobile condition in the actual pipeline completely, can infinitely variable, can adjust buggy concentration wantonly.
(2) The utility model discloses the velocity of flow that buggy air mixing flows is demarcated to that can be accurate to the problem of conventional test means gas circuit jam has been solved.
(3) The utility model discloses can the accurate buggy concentration of demarcating in the pipeline to the interference problem of conventional sample mode to intraductal flow has been solved.
Drawings
FIG. 1 is a schematic view of the overall layout of the present invention;
FIG. 2 is a schematic view of the main body of the present invention;
fig. 3 is a schematic view of the pulverized coal concentration calibration device of the present invention;
fig. 4 is a schematic layout diagram of the laser (5) and the CCD camera (6) according to the present invention;
FIG. 5 shows the calibration result of the friction resistance balance for measuring the concentration of the pulverized coal.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The device is a ground calibration device for a pulverized coal concentration measurement system, and can be used for calibrating the test precision of various pulverized coal concentration measurement devices. The device can simulate the flowing condition in an actual coal conveying pipeline and accurately calibrate the concentration of the pulverized coal in the pipeline.
As shown in fig. 1, the device is a ground calibration device of a pulverized coal concentration measurement system, and is characterized in that: the device comprises a main body rectangular pipeline (1), a pulverized coal feeding device (2), an axial flow fan (3), a small-range high-precision pressure transmitter (4), a laser (5), a CCD camera (6), a pulverized coal concentration measuring system mounting table (7), a data acquisition computer (8), a pulverized coal concentration calibration device (9) and a pulverized coal emptying device (10).
As shown in fig. 2, the main body square-shaped pipeline (1) is a hollow closed pipeline and is a square-shaped pipeline formed by connecting transparent organic glass pipes, and a mixture of pulverized coal and air flows in the main body square-shaped pipeline (1) anticlockwise. The main body pipe (1) comprises: the coal powder mixing device comprises a power section (11), a coal powder mixing section (12), a test section (13) and 4 corners, wherein the 4 corners are a corner (I), a corner (II), a corner (III) and a corner (III) respectively; the corner (I), the corner (II), the corner (III) and the corner (IV) are arranged anticlockwise in sequence; the pipeline between the corner (I) and the corner (II) is a power section (11), the pipeline between the corner (I) and the corner (II) and the corner (III) is a pulverized coal mixing section (12), and the pipeline between the corner (III) and the corner (II) is a test section (13);
the pulverized coal feeding device (2) is communicated with the main body rectangular pipe (1), and a feeding port can be opened and closed; the installation position of the coal powder feeding device (2) is arranged at the upstream of the axial flow fan (3). The fan blades of the axial flow fan (3) are arranged in the main body rectangular pipe (1), and the driving motors of the fan blades are arranged outside the main body rectangular pipe (1).
The small-range high-precision pressure transmitter (4) is arranged at one corner of the main body rectangular pipe (1) and is positioned at the downstream of the axial flow fan (3), two pressure measuring holes are formed in the corner, and the small-range high-precision pressure transmitter (4) measures local static pressure through the pressure measuring holes and transmits the local static pressure to the data acquisition computer (8);
as shown in fig. 4, the laser (5) is arranged on the side surface of the main body rectangular pipe (1), the CCD camera (6) is arranged at the downstream of the pressure measuring hole, the data acquisition computer (8) controls the laser (5) to generate laser, the output optical axis of the laser (5) passes through the main body rectangular pipe (1), the data acquisition computer (8) controls the CCD camera (6) to acquire the image of the laser output by the laser (5) entering the main body rectangular pipe (1), and the acquired image is transmitted back to the data acquisition computer (8);
the coal powder concentration measuring system mounting platform (7) is mounted on the main body square pipe (1) and serves as a mounting platform for a product to be calibrated;
the pulverized coal concentration calibration device (9) is movably arranged on the main body square pipe (1) and calibrates the pulverized coal concentration in the main body square pipe (1); as shown in fig. 3, the main body of the coal dust collector is a sealed hollow cylinder (91), one end face of the cylinder is a top plate, the top plate is provided with 3 connectors (92, 93 and 94), the connector (92) is connected with a pressure gauge for monitoring the pressure in the coal dust concentration calibration device (9), the connector (93) is connected with a vacuum pump for vacuumizing the hollow cylinder (91), the connector (94) is connected with a spray pipe (95) and then connected with a sampling elbow pipe (96), and the sampling elbow pipe (96) extends into the main body hollow pipe (1) to extract coal dust and is conveyed into the hollow cylinder (91) through the spray pipe (95).
The coal dust emptying device (10) is arranged on the main body square-shaped pipeline (1), is a hole which can be opened and closed and is used for emptying the coal dust in the main body square-shaped pipeline (1).
The device uses the axial flow fan (3) which can change speed in a stepless way as a power output device, so that different flowing speeds can be simulated; the coal powder feeding device (2) is arranged at the upstream of the axial flow fan (3), and the coal powder and the air are fully mixed through the fan blades, so that the flowing condition in an actual pipeline is better simulated.
The device adopts a method for measuring corner loss to measure the flow velocity. The airflow flows through the corner, the larger the dynamic pressure is, the larger the corner loss is, and the corner loss Δ q ═ q isBefore corner-qAfter the cornerThe quadratic form of the flow velocity V has a positive correlation with the corner loss Δ q, V2K Δ q, the coefficient K can be calibrated with pitot tubes in an empty flow field (no pulverized coal). Because the total pressure is equal before and after the corner because the corner is in the closed return pipeline, the corner loss delta q is equal to p according to the Bernoulli principleAfter the corner-pBefore corner(p is the local static pressure). And measuring static pressure of front and rear pipe walls at the corner and the third place by using a pressure transmitter to measure corner loss. The pitot tube probe and the like used in conventional flow rate monitoring need to measure the total flow pressure of the measured flow to calculate the flow rate, so that the coal dust particles in the air flow can block a measuring air path. The corner loss measurement is to calculate the flow velocity by measuring the static pressure of the pipe wall before and after the corner, and the static pressure on the pipe wall is negative at the moment, so that the pulverized coal particles cannot be generatedEntering a measuring gas circuit and blocking a pipeline.
The coal dust concentration calibration device (9) is also a sampling and weighing idea in nature, but is extremely innovative in specific implementation scheme. As shown in fig. 3, in sampling, the device (9) first opens the throttle valve behind the mouthpiece (93) and closes the throttle valve behind the mouthpiece (94), and the air in the cylinder (91) is evacuated by the vacuum pump; observing the coefficient of a pressure gauge, closing a vacuum pump and a joint valve (93) when the pressure in the barrel is close to vacuum, and weighing the whole sampling device at the moment; and then opening a joint valve of the interface (94) and collecting the pulverized coal-air mixed airflow in the pipeline into the cylinder by using pressure difference. However, the pressure difference affects the actual flow in the pipe, so that a section of the lance (95) is connected after the sampling pipe (96), and because of the large pressure difference between the barrel (91) and the pipe (1), the flow velocity in the sampling channel is accelerated to the sonic velocity in a very short time, after which the flow velocity does not increase any more. At the moment, the front and the rear total pressures of the spray pipe are equal, no pressure difference exists, and no influence is generated on the flow in the main pipeline. After the collection is finished, the coal powder mass can be accurately obtained by weighing and deducting the air mass calculated by the sampling time length, and finally the accurate coal powder concentration is obtained.
The device adopts a method for measuring corner loss to measure the flow speed, and calculates the flow speed by measuring the static pressure of the pipe wall before and after the corner, and because the static pressure on the pipe wall is negative at the moment, pulverized coal particles cannot enter a measuring gas circuit to block a pipeline.
The pulverized coal concentration calibration device (9) of the device is connected with a section of spray pipe (95) behind a sampling bent pipe (96), and the characteristics of equal front and back total pressure and no pressure difference of a sonic spray pipe are utilized, so that the flow in a main pipeline is not influenced when sampling is carried out.
A system for measuring the concentration of the pulverized coal by using a friction balance is taken as an application example and specifically comprises the following steps:
step one, calibrating the flow rate. At the moment, pulverized coal is not put into the system, and only air circulates in the pipeline (1). The wind speed V inside the pipe is now measured with a pitot tube. Meanwhile, the corner loss at the corner position is measured through the pressure transmitter. After measuring a plurality of groups of corresponding wind speeds and corner losses, calibrating a coefficient K of the wind speeds and the corner losses, and then obtaining the corresponding wind speeds by monitoring the corner losses at the corner position three.
And step two, installing a pulverized coal measuring device. The friction resistance balance device is arranged on the mounting table (7), is connected to an acquisition computer (8) together with the arranged laser (5) and the CCD camera (6), and is controlled by the computer to carry out optical monitoring and coal dust concentration measurement data acquisition.
And step three, feeding coal powder. A certain amount of coal dust is put into the pipeline (1) through the coal dust feeding device, the power section is opened to start circulation, and the next step is carried out after the coal dust is fully mixed in the pipeline.
And step four, measuring the concentration of the pulverized coal. The numerical value measured by the friction resistance balance is collected by a collecting computer (8), a coal powder concentration calibration device (9) is used for collecting samples from the test section, weighing calculation is carried out, and the coal powder concentration in the test section at the moment is calculated. And calibrating the result obtained by measuring the friction resistance balance by using the coal powder concentration result obtained by the coal powder concentration calibration device (9).
And step five, optical monitoring. And collecting an image result obtained by an optical monitoring system while measuring the concentration of the pulverized coal, and analyzing the pulverized coal distribution condition in the pipeline by a computer image recognition technology. And comparing the result of the optical monitoring with the result of the coal powder concentration measurement to establish a corresponding relation. And then the change condition of the concentration of the pulverized coal in the pipeline can be monitored in an auxiliary way through an optical monitoring system.
And repeating the third step to the fifth step, simulating different flow rates and coal dust concentrations as much as possible, and finally establishing a coal dust concentration measurement database capable of completely covering the industrial working condition.
FIG. 5 shows the calibration result of the friction drag balance for measuring the concentration of pulverized coal, the simulation range of the wind speed of the device is 10-30 m/s, the diameter of the pulverized coal particles is 0.5-0.8mm, and the simulation range of the concentration of the pulverized coal is 0.1-2 kg/m3The flow condition of an industrial practical coal conveying pipeline is completely covered.
The volume of the pipeline of the main body (1) of the device can be obtained by calculation (V), the mass (M) of the fed pulverized coal is controlled, and the concentration c in the pipeline at the moment can be obtained1(ii) a The concentration result is obtained by a coal dust concentration calibration device (9)c2Measured by c2And c1Within 5%.
Adopt the utility model discloses buggy concentration measurement system ground calibration device is markd buggy concentration measurement system, and the simulation industry coal conveying pipe that can be accurate is inside to flow, can reduce cost simultaneously, improves economic benefits.
The details of the present invention not described in detail in the specification are well known to those skilled in the art.
Claims (11)
1. The utility model provides a buggy concentration measurement system's ground calibration device which characterized in that includes: the device comprises a main body rectangular pipeline (1), a pulverized coal feeding device (2), an axial flow fan (3), a small-range high-precision pressure transmitter (4), a laser (5), a CCD camera (6), a pulverized coal concentration measuring system mounting table (7), a data acquisition computer (8), a pulverized coal concentration calibration device (9) and a pulverized coal emptying device (10);
the pulverized coal feeding device (2) is arranged at the upstream of the axial flow fan (3), the fan blades of the axial flow fan (3) are arranged in the main body rectangular pipe (1), and the driving motors of the fan blades are arranged outside the main body rectangular pipe (1); the small-range high-precision pressure transmitter (4) is arranged at one corner of the main body rectangular pipe (1) and is positioned at the downstream of the axial flow fan (3), two pressure measuring holes are formed in the corner, and the small-range high-precision pressure transmitter (4) measures local static pressure in the pressure measuring holes through the pressure measuring holes and transmits the local static pressure to the data acquisition computer (8);
the laser device (5) is arranged on the side face of the main body rectangular pipe (1), the CCD camera (6) is arranged at the downstream of the pressure measuring hole, the data acquisition computer (8) controls the laser device (5) to generate laser, the output optical axis of the laser device (5) penetrates through the main body rectangular pipe (1), the data acquisition computer (8) controls the CCD camera (6) to acquire images of the laser which is output by the laser device (5) and enters the main body rectangular pipe (1), and the acquired images are transmitted back to the data acquisition computer (8);
the coal powder concentration measuring system mounting platform (7) is mounted on the main body square pipe (1) and serves as a mounting platform for a product to be calibrated;
the pulverized coal concentration calibration device (9) is movably arranged on the main body square pipe (1) to calibrate the pulverized coal concentration in the main body square pipe (1);
the coal dust emptying device (10) is arranged on the main body square-shaped pipeline (1), is a hole which can be opened and closed and is used for emptying the coal dust in the main body square-shaped pipeline (1).
2. The ground calibration device of the pulverized coal concentration measurement system according to claim 1, characterized in that: the main body square-shaped pipeline (1) is a hollow closed pipeline, and a mixture of coal powder and air flows anticlockwise in the main body square-shaped pipeline (1).
3. The ground calibration device of the pulverized coal concentration measurement system according to claim 1, characterized in that: the feeding port of the coal powder feeding device (2) is communicated with the main body square-shaped pipeline (1), and the feeding port can be opened and closed.
4. The ground calibration device of the pulverized coal concentration measurement system according to claim 1, characterized in that: the small-range high-precision pressure transmitter (4) has a range of-1000 to 1000 pa.
5. The ground calibration device of the pulverized coal concentration measurement system according to claim 1, characterized in that: the main body square-shaped pipeline (1) is a square-shaped pipeline formed by connecting transparent organic glass pipes and used for simulating a coal powder conveying pipeline, and meanwhile, the pipeline is transparent and convenient to observe and optically monitor.
6. The ground calibration device of the pulverized coal concentration measurement system according to claim 1, characterized in that: the output energy of the laser (5) is 80-180 mw.
7. The ground calibration device of the pulverized coal concentration measurement system according to claim 1, characterized in that: a product under test comprising: a system for measuring the concentration of the pulverized coal by a friction balance, a system for measuring the concentration of the pulverized coal by an electrostatic method and the like.
8. The ground calibration device of the pulverized coal concentration measurement system according to claim 1, characterized in that: the main body pipe (1) comprises: the coal powder mixing device comprises a power section (11), a coal powder mixing section (12), a test section (13) and 4 corners, wherein the 4 corners are a corner (I), a corner (II), a corner (III) and a corner (III) respectively; the corner (I), the corner (II), the corner (III) and the corner (IV) are arranged anticlockwise in sequence; the pipeline between the corner (I) and the corner (II) is a power section (11), the pipeline between the corner (I) and the corner (II) and the pipeline between the corner (II) and the corner (III) is a pulverized coal mixing section (12), and the pipeline between the corner (III) and the corner (II) is a test section (13).
9. The ground calibration device of the pulverized coal concentration measurement system according to claim 1, characterized in that: the pulverized coal feeding device (2) is located at the upstream of the axial flow fan (3), pulverized coal is more uniformly distributed in the pipeline through mixing of the axial flow fan (3), the axial flow fan (3) is connected with the frequency converter, the axial flow rotating speed is stepless and adjustable, and different flowing speeds can be simulated.
10. The ground calibration device of the pulverized coal concentration measurement system according to claim 1, characterized in that: and two ends of the small-range high-precision pressure transmitter (4) are respectively connected to the pipe walls at the corner inlet and the corner outlet to measure local static pressure, and the corner is the corner at the upstream of the test section, so that the dynamic pressure loss at the corner is obtained, and the flow velocity in the pipeline at the test section is obtained.
11. The ground calibration device of the pulverized coal concentration measurement system according to claim 1, characterized in that: pulverized coal concentration calibration device (9), its main part is a sealed cavity drum (91), an end face of drum is the roof, there are 3 interfaces on the roof, be first interface (92), second interface (93), third interface (94) respectively, first interface (92) connect the manometer and are used for monitoring pulverized coal concentration calibration device (9) internal pressure, second interface (93) connect the vacuum pump, be used for evacuation in cavity drum (91), connect a sample return bend (96) again behind third interface (94) connect a spray tube (95), sample return bend (96) stretch into main part form return pipe (1) and draw the pulverized coal, through spray tube (95), send to in cavity drum (91).
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| CN113820261A (en) * | 2021-11-22 | 2021-12-21 | 枣庄高新建设集团有限公司 | Building environment monitoring device for civil building engineering |
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| CN113820261A (en) * | 2021-11-22 | 2021-12-21 | 枣庄高新建设集团有限公司 | Building environment monitoring device for civil building engineering |
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