CN216283709U - Device for measuring solid phase flow in pipeline of gas-solid two-phase flow - Google Patents

Abstract

The utility model discloses a device for measuring solid phase flow in a pipeline of gas-solid two-phase flow, which comprises a local resistance pipe section, a first detection port, a second detection port and a third detection port, wherein the local resistance pipe section is a reducing pipe section or a pore plate pipe section; the first pressure sensor is used for measuring a pressure difference PA between the first detection port and the atmospheric pressure; the third detection port is arranged at the resistance rear section of the local resistance pipe section; and the data processor is respectively connected with the first pressure sensor and the second pressure sensor. The measuring device provided by the embodiment of the utility model has the advantages of simple structure, few components and convenience in use.

Description

Measuring device for solid phase flow in pipeline of gas-solid two-phase flow

technical field

The utility model relates to the field of flow measurement of pneumatic conveying, in particular to a device for measuring solid-phase flow in a pipeline of gas-solid two-phase flow.

Background technique

In tobacco, coal, grain, pharmaceutical, chemical, food and other process industries, pipeline gas transportation is often used, and the gas phase carries the solid phase to complete the transportation function. During this process, measurement of solid phase flow is often required to determine delivery parameters and guide the next step in production. At this stage, methods such as static weighing method, differential pressure method, electromagnetic method, optical method, ray method and ultrasonic method are generally used to measure solid phase flow. Due to the different measurement principles, these methods exist in terms of measurement accuracy and real-time performance. varying degrees of difficulty. Among them, the static weighing method realizes mass flow measurement by sampling static weighing, the measurement time response is slow, the real-time performance is poor, and the accuracy is poor in the case of rapid process changes; the existing differential pressure method to measure solid phase mass flow relies on The gas-solid ratio, gas-solid cross-sectional flow velocity, etc. are used to calculate the solid-phase flow rate, and at the same time, the correction coefficient is used for correction. The measurement accuracy of the differential pressure method is poor; the electromagnetic method uses the weak charge on the surface of the material to achieve induction. The difference in the amount of charge is large, and the error of the measured material mass flow is large; the optical method, ray method, ultrasonic method, etc. all use indirect measurement, the superposition and dispersion of materials are different, and the measurement results are very different, and the accuracy is very high. Difference. In view of the above existing methods, the measurement of the solid phase flow in the gas-solid two-phase flow is a difficulty in the existing measurement technology. Due to the existence of the solid phase, the measurement accuracy of the existing gas phase is also greatly affected.

Due to the characteristics of loose solid-phase material, fast flow rate and high material humidity in tobacco conveying, the existing technology is difficult to measure the solid-phase flow rate, and the real-time performance and accuracy are poor.

SUMMARY OF THE INVENTION

The utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present invention is to provide a measuring device for solid phase flow in a pipeline of gas-solid two-phase flow, which has a simple structure, few components and is convenient to use.

According to an embodiment of the first aspect of the present utility model, a device for measuring solid-phase flow in a pipeline of gas-solid two-phase flow, the measuring device includes: a local resistance pipe section, and the local resistance pipe section is suitable for a gas-solid two-phase flow. The pipeline is connected, and the local resistance pipe section is a variable diameter pipe section or an orifice pipe section; a first detection port and a second detection port, the first detection port and the second detection port are both arranged on the local resistance pipe section. The front section of resistance; a first pressure sensor, the first end of the first pressure sensor is communicated with the first detection port and the second end of the first pressure sensor is communicated with the atmosphere, for measuring the first detection port the pressure difference PA between the The second detection port is communicated and the second end of the second pressure sensor is communicated with the third detection port for measuring the pressure difference PB between the second detection port and the third detection port; data processing The data processor is respectively connected with the first pressure sensor and the second pressure sensor.

According to the device for measuring the solid-phase flow in the pipeline of gas-solid two-phase flow according to the embodiment of the present invention, by setting a local resistance pipe section, and setting a first detection port, a second detection port and a third detection port in the local resistance pipe section, The pressure difference is measured by connecting the pressure sensor with different detection ports, and then the solid-phase flow is measured by the data processor. The utility model has the advantages of simple structure, few components and wide application occasions, and can be widely used in industrial occasions such as coal transportation, tobacco processing, grain transportation, chemical production, etc., and the use is relatively convenient.

According to some embodiments of the present invention, when the local resistance pipe section is a reduced diameter pipe section, the first detection port and the second detection port are located in the first section of the reduced diameter pipe section, and the third detection port is located in the first section of the reduced diameter pipe section. In the second section of the reducing pipe section, the diameter of the first section is larger than the diameter of the second end.

According to some embodiments of the present invention, the local resistance pipe section is a Venturi pipe section or a direct reducing pipe section.

According to some embodiments of the present invention, when the local resistance pipe section is an orifice plate pipe section, the first detection port and the third detection port are located on both sides of the orifice plate of the orifice plate pipe section, respectively. The second detection port and the first detection port are located on the same side of the orifice plate of the orifice plate tube section.

According to some embodiments of the present invention, the measuring device further includes an automatic cleaning device, and the automatic cleaning device communicates with the orifice plate of the orifice plate tube section to clean the orifice plate.

Additional aspects and advantages of the invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments in conjunction with the accompanying drawings, wherein:

1 is a schematic diagram of a device for measuring solid-phase flow in a pipeline of gas-solid two-phase flow according to an embodiment of the present invention;

2 is a schematic diagram of a device for measuring solid-phase flow in a pipeline of gas-solid two-phase flow according to another embodiment of the present invention;

3 is a schematic diagram of a device for measuring solid-phase flow in a pipeline of gas-solid two-phase flow according to yet another embodiment of the present invention;

4 is a schematic diagram of a fitting process of a method for measuring solid-phase flow in a gas-solid two-phase flow according to an embodiment of the present invention;

5 is a schematic diagram of a fitting process of a method for measuring solid-phase flow in a gas-solid two-phase flow according to an embodiment of the present invention;

6 is a schematic diagram of a fitting process of a method for measuring solid-phase flow in a gas-solid two-phase flow according to an embodiment of the present invention.

Reference number:

1. Local resistance pipe section, 2. Flow measurement system, 3. Data processor, 4. First detection port, 5. Second detection port, 6. Third detection port, 7. First pressure sensor, 8. Second Pressure sensor, 9. Automatic cleaning system, 10. Venturi tube, 11. Direct reducer tube, 12. Orifice plate.

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but should not be construed as a limitation of the present invention.

The following describes a device for measuring solid phase flow in a pipeline of gas-solid two-phase flow according to an embodiment of the present invention with reference to FIGS. 1 to 3 .

The device for measuring the solid phase flow in the pipeline of gas-solid two-phase flow according to the embodiment of the present invention includes a local resistance pipe section, a first detection port and a second detection port, a first pressure sensor, a third detection port, and a second pressure sensors and data processors.

The local resistance pipe section can be adapted to communicate with the gas-solid two-phase flow pipeline to be measured to generate local resistance. The two detection ports are located in the pipe section before the local resistance pipe section generates resistance. The first end of the first pressure sensor is communicated with the first detection port, and the second end is communicated with the atmospheric pressure, for measuring the pressure difference PA between the pressure at the first detection port and the atmospheric pressure.

The third detection port is located in the resistance rear section of the local resistance pipe section, that is, the third detection port is located in the pipe section after the local resistance pipe section generates resistance. The first end of the second pressure sensor is connected to the second detection port, and the second end is connected to the The three detection ports are connected to measure the pressure difference PB between the pressure before resistance loss and the pressure after resistance loss of the second detection port.

Further, the data processor is respectively connected with the first pressure sensor and the second pressure sensor to receive the measurement data differential pressure PA, PB of the first pressure sensor and the second pressure sensor, and use the differential pressure PA, PB to calculate the solid phase flow.

By setting up a local resistance pipe section, and setting a first detection port, a second detection port and a third detection port in the local resistance pipe section, the pressure sensor is connected with the different detection ports to measure the pressure difference, and then the solid-phase flow measurement is performed by the data processor. Compared with the related art, the solid-phase flow measuring device has a complex structure and is inconvenient to use. , food transportation, chemical production and other industrial occasions, it is more convenient to use.

As shown in FIGS. 1-3 , in some embodiments of the present invention, the local resistance pipe section is a variable diameter pipe section or an orifice plate pipe section.

In some examples, as shown in Fig. 1-2, when the local resistance pipe section is a reducing pipe section, the first detection port and the second detection port are located in the first section of the reducing pipe section, and the third detection port is located in the second section of the reducing pipe section. The diameter of the first section is greater than the diameter of the second end, wherein the local resistance pipe section is a Venturi pipe section or a direct reducing pipe section.

In other examples, as shown in FIG. 3 , when the local resistance pipe section is an orifice plate pipe section, the first detection port and the third detection port are located on both sides of the orifice plate of the orifice plate pipe section, respectively, and the second detection port and the first detection port On the same side of the orifice plate of the orifice plate segment.

Further, in order to prevent the orifice plate from being blocked by materials, dust, etc., an automatic cleaning device is also included, and the automatic cleaning device is communicated with the orifice plate of the orifice plate tube section to clean the orifice plate.

In some embodiments, the data processor may be a computer host, or a data analysis component. The host or data analysis component uses a preset formula C=k2(PB-k1*PA)+b1 to calculate the solid phase flow rate C, Among them, K1, K2 and b1 are parameters pre-determined according to preset conditions before connecting with the gas-solid two-phase flow pipeline to be measured, wherein 0.5≤K1≤0.8, -0.001≤K2≤-20, 0≤b1≤500 .

According to some embodiments of the present invention, the data processor includes a fitting component, and the fitting component obtains the parameter K1, the parameter K2 and the parameter b1 by pre-fitting under a preset condition, and the preset condition is that the local resistance pipe section is According to the preset solid phase flow rate and gas phase flow rate, the same gas-solid two-phase flow as the pipeline is delivered, that is to say, the parameters K1, K2, b1 are between the measuring device and the actual gas-solid two-phase flow pipe to be measured. Specifically, under the experimental conditions, the same gas-solid two-phase flow as the pipeline to be measured is used, and when the preset solid-phase flow rate is known, the gas-phase flow rate, such as the gas flow rate, is adjusted by using The fitting method measures the parameter K1, the parameter K2 and the parameter b1.

According to some embodiments of the present invention, the fitting component includes a first fitting unit, and the first fitting unit, under the preset condition, varies according to different groups of solid-phase flow rates and each group of solid-phase flow rates in different The pressure difference PA and the pressure difference PB under the gas-phase flow rate of The slopes of the different straight lines are averagely fitted to obtain a first slope and an intercept value of the straight lines corresponding to different groups of solid phase flow rates, where the first slope is the parameter k1.

The specific fitting process includes: S11, under preset conditions, fix the solid phase flow C in the gas-solid two-phase flow, and detect the pressure difference PA and the pressure difference PB in the local resistance pipe section by adjusting different gas flow rates;

S12, fitting a straight line corresponding to the solid phase flow rate C in a coordinate system with the pressure difference PA as the horizontal axis and the pressure difference PB as the vertical axis;

S13, repeating steps S11-S12, and making the solid-phase flow rates C of each group different, and fitting straight lines corresponding to the solid-phase flow rates C of different groups;

S14, perform an average slope fitting on the straight lines corresponding to different groups of solid phase flow rates C obtained in step S13, and obtain a first slope and intercept values of the lines corresponding to different groups of solid phase flow rates by fitting, and the first slope is parameter K1.

According to some embodiments of the present invention, the fitting component further includes a second fitting unit, and the second fitting unit fits the intercept values corresponding to different groups of solid phase flow rates and the corresponding solid phase flow rates obtained by the fitting of the first fitting unit. The flow rate C is fitted to a straight line, the slope of the straight line is the second slope, the second slope is the parameter k2, and the intercept of the straight line is the parameter b1.

The specific fitting process further includes: S15, in a coordinate system with the intercept as the horizontal axis and the solid phase flow as the vertical axis, fitting the intercept values corresponding to different groups of solid phase flow rates and the solid phase flow rates in step S14 in step S14 get a straight line;

S16, calculating the second slope of the straight line obtained by fitting different groups of solid-phase flow rates and the intercept values corresponding to the solid-phase flow rates, where the second slope is the parameter K2;

S17: Calculate the intercept value of the vertical axis of the straight line obtained by fitting the solid-phase flow rates of different groups and the intercept values corresponding to the solid-phase flow rates, and the intercept value is the parameter b1.

In some embodiments, the data processor further includes an adjustment parameter b2, where b2 is a correction number, and the preset formula is further preferably C=k2(PB-k1*PA)+b1+b2, that is, at the same time as the gas-solid to be measured After the phase flow pipeline is connected to the measured parameters K1, K2 and b1, the local resistance pipe section of the measuring device is connected to the gas-solid two-phase flow pipeline to be measured, and the actual zero adjustment is carried out according to the working conditions and temperature of the site through the correction parameter b2.

The following describes the device for measuring the solid-phase flow in the pipeline of gas-solid two-phase flow according to the embodiment of the present invention with reference to specific embodiments.

As shown in Figure 1, according to a specific embodiment of the present utility model, the device for measuring solid-phase flow in the pipeline of gas-solid two-phase flow, the device for measuring solid-phase flow in the pipeline of gas-solid two-phase flow comprises a local resistance pipe section 1 ( Venturi 10), flow measurement system 2 and data processor 3. The flow measurement system 2 is composed of a first detection port 4, a second detection port 5, a third detection port 6, a first pressure sensor 7 and a second pressure sensor 8. The local resistance pipe section 1 is a Venturi that contracts first and then gradually expands. Tube. The first detection port 4 and the second detection port 5 are opened at the position before the pipe diameter of the venturi tube 10 shrinks, and the third detection port 6 is opened at the position after the pipe diameter of the venturi tube is contracted to the narrowest throat portion, The first detection port 4, the first pressure sensor 7, and the atmosphere are connected by pipelines to measure the differential pressure PA and the corresponding pressure fluctuations; the second detection port 5, the second pressure sensor 8, and the third detection port 6 are connected by pipelines to measure The pressure difference PB and the corresponding pressure fluctuations form a sampling pipeline. The sampled signal is connected to the data processor 3 through a circuit. When the gas-solid two-phase flow flows through the pipeline, resistance loss will occur. Due to the amplification effect of the local resistance pipe section 1 (Venturi tube 10), the generated pressure differences A and B have a relatively significant linear relationship, while the slope of the curve, The intercept has a certain linear relationship with the material flow. Through this principle, real-time fitting parameters are generated, packaged in the data processor 3, and the pressure differences A and B are collected into the data processor in real time through the sampling pipeline for calculation. , to get the material flow in the pipeline. At the same time, the material flow is calibrated by means of filtering, averaging, and comparison iteration, etc., and output to the display screen.

As shown in Figure 2, according to another specific embodiment of the present utility model, the measuring device for solid phase flow in the pipeline of gas-solid two-phase flow adopts direct reducing pipe 11 as the local resistance pipe section 1, and the principle and steps are the same as those in Example 1. .

3, according to another specific embodiment of the present utility model, the measuring device for solid phase flow in the pipeline of gas-solid two-phase flow adopts the pipe section provided with the orifice plate 12 as the local resistance pipe section 1, and due to the characteristics of the orifice plate, It is easy to be blocked, so the measuring device of the orifice plate is optimized by matching the automatic cleaning device. The automatic cleaning system is an air pump, which can generate high-pressure gas. One way of the through valve is in a normally closed state. When the measuring device stops working, open the one way valve of the air pump, start the air pump to generate high-pressure gas, and blow the orifice plate 12 with high pressure to clean the materials and dust attached to the orifice plate 12.

The method for measuring the solid-phase flow in the gas-solid two-phase flow according to the second aspect of the present invention includes the following steps:

S1, the parameter K1, the parameter K2 and the parameter b1 are obtained by pre-fitting under a preset condition, and the preset condition is that the local resistance pipe section transports the same as the pipeline according to the preset solid phase flow rate and gas phase flow rate condition. gas-solid two-phase flow;

S2, the gas-solid two-phase flow to be measured is introduced into the local resistance pipe section;

S3, measure the pressure difference PA between the resistance front section of the local resistance pipe section and the atmospheric pressure;

S4, measure the pressure difference PB between the resistance front section and the resistance rear section of the local resistance pipe section;

S5, calculate the solid phase flow rate C in the gas-solid two-phase flow to be measured by applying a preset formula according to the pressure difference PA and the pressure difference PB, the preset formula includes: C=k2(PB-k1*PA)+b1,

Among them, 0.5≤K1≤0.8, -0.001≤K2≤-20, 0≤b1≤500.

Further, step S1 includes:

S11, under preset conditions, the solid-phase flow rate C is fixed in the gas-solid two-phase flow, and the pressure difference PA and the pressure difference PB in the local resistance pipe section are detected by adjusting different gas-phase flow rates;

S12, fitting a straight line corresponding to the solid phase flow rate C in a coordinate system with the pressure difference PA as the horizontal axis and the pressure difference PB as the vertical axis;

S13, repeating steps S11-S12, and making the solid-phase flow rates C of each group different, and fitting straight lines corresponding to the solid-phase flow rates C of different groups;

S14, perform an average slope fitting on the straight lines corresponding to different groups of solid phase flow rates C obtained in step S13, and obtain a first slope and intercept values of the lines corresponding to different groups of solid phase flow rates by fitting, and the first slope is parameter K1;

S15, in a coordinate system with the intercept as the horizontal axis and the solid-phase flow as the vertical axis, a straight line is obtained by fitting the intercept values corresponding to different groups of solid-phase flow and the solid-phase flow in step S14;

S16, calculating the second slope of the straight line obtained by fitting different groups of solid-phase flow rates and the intercept values corresponding to the solid-phase flow rates, where the second slope is the parameter K2;

S17: Calculate the intercept value of the vertical axis of the straight line obtained by fitting the solid-phase flow rates of different groups and the intercept values corresponding to the solid-phase flow rates, and the intercept value is the parameter b1.

Specifically, after selecting the local resistance pipe section, use an electronic scale to weigh different amounts of materials, for example, 5-6 groups, and carry out a parameter measurement experiment. The main steps are to uniformly feed the material, adjust different gas-phase velocities, thereby changing the gas-solid ratio of the gas-solid two-phase flow, record different pressure differences PA and PB, and perform a linear fit according to different material flows, and select the maximum Slope and minimum slope, within this range, re-fit the line with different slopes, and fine-tune the slope until the average fit of all fitted lines is the smallest, and the slope at this time is the calibrated K1; At this time, a linear fitting is performed between the intercepts of all fitted straight lines and the material flow, the slope is the calibrated K2, and the intercept is the calibrated b1. And b1 needs to be used in different environments, through tuning experiments, fine-tuning to ensure the accuracy of the system.

The following is an explanation with specific examples, as shown in Figure 4. In the case of different groups of solid phase flow rates, such as solid phase flow rate C1=100kg/h, adjust the gas phase flow rate (wind speed), record the different pressure differences PA and PB at this time, and draw The straight line of solid phase flow rate C1=100kg/h, similarly, draw the straight line of solid phase flow rate C2=200kg/h, C3=300kg/h, C4=400kg/h in turn.

Through the approach algorithm (take the maximum value of the slope, the minimum value is the upper and lower limits of the interval, and then adjust the slope continuously in the range, use the slope to inversely fit the points obtained by the experiment, until the average fitting degree of the above-mentioned straight line reaches the best) Fitting is carried out so that the average fitting degree of the straight line of solid phase flow C1=100kg/h, C2=200kg/h, C3=300kg/h, C4=400kg/h is the best, and the slope of the straight line is the first slope. , which is k1. And use the slope k1 to re-fit the points obtained by the experiment to obtain the fitted straight lines, and draw these straight lines, as shown in Figure 5. At this time, record each solid phase flow C1=100kg/h, C2=200kg/h, C3= Corresponding vertical axis intercept value at 300kg/h and C4=400kg/h.

As shown in Figure 6, the intercepts of all fitted straight lines are used as the x-axis, and the solid phase flow represented by all the straight lines is used as the y-axis to draw a straight line. The slope of the straight line is the second slope K2, and the intercept value corresponding to the vertical axis It is the b1 obtained.

Therefore, according to the method for measuring the solid-phase flow rate in the gas-solid two-phase flow according to the embodiment of the present invention, parameters K1, K2 and b1 are pre-fitted under preset conditions through experiments, and then the local resistance pipe section is matched with the gas to be measured. The solid two-phase flow pipeline is connected, and the pressure difference PA and PB at this time are detected. The preset formula C= k2(PB-k1*PA)+b1 is used to measure the solid phase flow rate. The measurement results of this method are reliable. The measurement data is stable, the response is fast, and the application is widely used. It can be widely used in coal transportation, tobacco processing, grain transportation, chemical production and other industrial occasions.

In the description of the present invention, "first feature" and "second feature" may include one or more of the features.

In the description of the present invention, "plurality" means two or more.

In the description of the present invention, a first feature being "above" or "under" a second feature may include that the first and second features are in direct contact, or that the first and second features are not in direct contact but through Additional feature contacts between them.

In the description of the present invention, the first feature "above", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is at a high level on the second feature.

Other configurations and operations of the device for measuring solid-phase flow in the pipeline of gas-solid two-phase flow and the method for measuring solid-phase flow in gas-solid two-phase flow according to the embodiment of the present invention are all familiar to those skilled in the art. It is known and will not be described in detail here.

In the description of this specification, reference to the terms "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples", etc., is meant to incorporate the embodiments A particular feature, structure, material, or characteristic described by an example or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention. Variations, the scope of the present invention is defined by the claims and their equivalents.

Claims (5)

1. a measuring device of solid-phase flow in the pipeline of gas-solid two-phase flow, is characterized in that, comprises: a local resistance pipe section, the local resistance pipe section is suitable for communicating with the pipeline of gas-solid two-phase flow, and the local resistance pipe section is a variable diameter pipe section or an orifice plate pipe section; a first detection port and a second detection port, the first detection port and the second detection port are both arranged in the resistance front section of the local resistance pipe section; A first pressure sensor, the first end of the first pressure sensor is communicated with the first detection port and the second end of the first pressure sensor is communicated with the atmosphere, for measuring the difference between the first detection port and the atmospheric pressure The pressure difference between PA; a third detection port, the third detection port is located in the resistance rear section of the local resistance pipe section; A second pressure sensor, the first end of the second pressure sensor communicates with the second detection port and the second end of the second pressure sensor communicates with the third detection port, for measuring the second pressure sensor The pressure difference PB between the detection port and the third detection port; and a data processor, which is respectively connected with the first pressure sensor and the second pressure sensor. 2 . The device for measuring solid phase flow in a pipeline of gas-solid two-phase flow according to claim 1 , wherein when the local resistance pipe section is a variable diameter pipe section, the first detection port and the second The detection port is located at the first section of the reduced diameter pipe section, the third detection port is located at the second section of the reduced diameter pipe section, and the diameter of the first section is larger than the diameter of the second end. 3 . The device for measuring solid-phase flow in a pipeline for gas-solid two-phase flow according to claim 2 , wherein the local resistance pipe section is a Venturi pipe section or a direct reducing pipe section. 4 . 4 . The device for measuring solid phase flow in a pipeline of gas-solid two-phase flow according to claim 1 , wherein when the local resistance pipe section is an orifice plate pipe section, the first detection port and the The third detection ports are respectively located on both sides of the orifice plate of the orifice plate tube section, and the second detection port and the first detection port are located on the same side of the orifice plate of the orifice plate tube section. 5 . The device for measuring solid phase flow in the pipeline of gas-solid two-phase flow according to claim 4 , further comprising an automatic cleaning device, which is communicated with the orifice plate of the orifice plate tube section. 6 . to wash the plate.

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