A perfluorohexanone valve pipe fitting friction loss test system and test method

Abstract

The present application relates to a kind of perfluorohexanone valve pipe fittings friction loss test system and test method, sample installation system;Opening pipeline air valve I, filter I, filter II, liquid tank vent valve, filter III, pipeline air valve II, filter IV, pipeline air valve III, filter V, pipeline air valve IV;Opening pipeline liquid filling valve, liquid tank is filled with perfluorohexanone fire extinguishing agent in test pipeline, close the valve of pipeline air valve I, liquid tank vent valve, pipeline air valve III, pipeline air valve IV, pipeline liquid filling valve;Opening stop valve, pressure sensor is connected with test pipeline;Frequency conversion control cabinet controls reciprocating pump to open to set flow, perfluorohexanone fire extinguishing agent flows through rectifier tank and circulates in test pipeline, the data collected by pressure sensor and flowmeter are transmitted to data collector, after the data of flow and pressure difference are collected by data collector, according to friction loss calculation formula, the friction loss of sample is calculated.

Description

Technical Field

[0001] This invention relates to the field of fire protection equipment, and in particular to a perfluorohexanone valve and fitting friction loss testing system and method, used to accurately test the friction loss of perfluorohexanone valves and fittings. Background Technology

[0002] In recent years, with the signing and entry into force of the Kyoto Protocol, the Montreal Protocol, and the Kigali Amendment to the Montreal Protocol, the application of new perfluorohexanone clean gas fire extinguishing equipment has been increasing year by year. However, due to the late start of research on perfluorohexanone gas fire extinguishing equipment in China, there is currently no accurate data on the friction loss of perfluorohexanone valves and fittings.

[0003] GB 25972-2010, section 6.8: National Standard, (1) The test medium used is water, which cannot truly reflect the friction loss of the sample; (2) The use of a water pump cannot completely remove air bubbles from the water flow, resulting in certain deviations in the test data.

[0004] Patent No.: 2020106321800, a patent application for a remotely controllable local resistance loss test system: (1) The test medium used is water, which cannot truly reflect the friction loss of the sample; (2) The water pump used cannot completely remove air bubbles from the water flow, resulting in certain deviations in the test data; (3) It cannot test larger-sized samples.

[0005] Currently, the lack of accurate data on friction loss in perfluorohexanone valves and fittings leads to the following problems:

[0006] 1. It is impossible to perform hydraulic calculations for the piping of perfluorohexanone gas fire extinguishing equipment;

[0007] 2. It is impossible to perform accurate design for actual engineering applications. Summary of the Invention

[0008] Given that existing technologies cannot accurately test the friction loss of samples, and that water testing cannot truly reflect the actual friction loss of samples, this invention provides a perfluorohexanone valve and fitting friction loss testing system and method, which can test the friction loss data of perfluorohexanone valves and fittings, providing basic data for the design of perfluorohexanone gas fire extinguishing equipment.

[0009] The technical solution adopted in this invention is: a perfluorohexanone valve and fitting friction loss testing system, comprising a sample, a system measurement and control pipeline section, and a data acquisition and processing section. The system measurement and control pipeline section is connected as follows: one end of a reciprocating pump is connected sequentially through a test pipeline to a rectifier tank, a vent valve, a shut-off valve, a pipeline vent valve III, a flow meter, the sample, a pipeline vent valve IV, a purge valve, a drain valve, a pipeline vent valve I, a pipeline filling valve, and the other end of the reciprocating pump to form a closed-loop pipeline; a filter III is connected to the pipeline vent valve II, and a pressure transmitter is connected to the shut-off valve. The sensor is connected to the pipeline vent valve III, which is connected to the filter IV. The pipeline vent valve IV is connected to the filter V. The cleaning valve is connected to the air compressor. The drain valve is connected to the vacuum pump and the gauge valve. The gauge valve is connected to the vacuum gauge. The pipeline vent valve I is connected to the filter I. The pipeline filling valve is connected to the storage tank. The storage tank is connected to the storage tank filling valve and the storage tank vent valve. The storage tank vent valve is connected to the filter II. The storage tank filling valve is connected to the vacuum pump and the exhaust valve through the test pipeline.

[0010] The system's measurement and control data acquisition and processing section is connected as follows: the data acquisition unit is connected to the pressure sensor and flow meter via lines, and the frequency converter control cabinet is connected to the vacuum pump, air compressor, and reciprocating pump via lines; the storage tank contains liquid perfluorohexanone gas extinguishing agent.

[0011] A test method for a perfluorohexanone valve and fitting friction loss testing system, comprising the following steps:

[0012] The first step in conducting the test is to install the sample on the test pipeline between the flow meter and the pipeline vent valve IV.

[0013] The second step is to open the pipeline vent valve I, filter I, filter II, liquid storage tank vent valve, filter III, pipeline vent valve II, filter IV, pipeline vent valve III, filter V, and pipeline vent valve IV to put the pipeline in an open state.

[0014] The third step is to open the pipeline filling valve and add perfluorohexanone extinguishing agent to the test pipeline from the storage tank until extinguishing agent overflows from filters I, III, IV and V. Then close the valves of pipeline vent valve I, storage tank vent valve, pipeline vent valve III, pipeline vent valve IV and pipeline filling valve to keep the pipeline in a closed state.

[0015] Fourth step: Open the shut-off valve and connect the pressure sensor to the test pipeline;

[0016] The fifth step involves pre-setting the test flow rate and controlling the reciprocating pump to the set flow rate via a frequency converter control cabinet. Perfluorohexanone extinguishing agent circulates in the test pipeline after passing through the rectifier tank. Pressure sensors and flow meters transmit the collected data to a data acquisition unit. The frequency of the reciprocating pump is controlled by the frequency converter control cabinet to adjust the test flow rate and pressure. The data acquisition unit then collects the sample flow rate. Q / L / min and pressure difference p After obtaining 5 sets of data for each pressure (pa), calculate the friction loss of the sample according to the friction loss calculation formula to confirm whether the sample pressure meets the requirements. During the test, ensure that the flow in the pipeline is turbulent and that the Reynolds number is greater than 1*10. 5 According to the Reynolds number calculation formula, the minimum Reynolds number is 1*10. 5 Substitute the values ​​into the Reynolds number calculation formula to calculate the minimum flow rate during the test;

[0017] Step 6: After the test is completed, open the drain valve, vacuum gauge, gauge valve, vacuum pump, and liquid filling valve of the storage tank to return the perfluorohexanone extinguishing agent to the storage tank, and open the vent valve to vent the air.

[0018] The seventh step is to use the frequency converter control cabinet to control the cleaning valve and the air compressor to purge the pipeline. After the test, the sample is reinstalled for the next test.

[0019] The minimum test flow rate mentioned in step 5 is calculated based on the pipe diameter to ensure that the Reynolds number is greater than 1*10. 5 The flow inside the pipeline is turbulent;

[0020] Calculate the Reynolds number R according to formula (1). e ,

[0021] R e = sd / (V F μ)………………………….(1)

[0022] In the formula

[0023] s—the flow rate of perfluorohexanone in the pipeline, m / s;

[0024] d—actual inner diameter of the pipe, in meters;

[0025] V F —Specific volume of perfluorohexanone, m 3 / kg;

[0026] μ—Dynamic viscosity of perfluorohexanone, kg / m∙s.

[0027] The formula for calculating friction loss in step 5 is as follows:

[0028] Calculate the equivalent length L according to equations (2) and (3);

[0029] L=L X -(a+b) ………………………………….(2)

[0030] ..............(3)

[0031] In the formula

[0032] L —Friction loss, m;

[0033] IX — Frictional loss between the sample and the test pipe, m;

[0034] P —Pressure difference, Pa;

[0035] d —Actual inner diameter of the pipe, in meters;

[0036] c —Measure the roughness coefficient of the pipeline; for galvanized pipes, take 120.

[0037] Q —Water flow rate, l / min;

[0038] a — The distance from the pressure measurement point at the front of the sample to the sample, in meters;

[0039] b — The distance from the pressure measurement point at the rear end of the sample to the sample, in meters.

[0040] The sample is a perfluorohexanone valve, straight pipe section, or fitting.

[0041] The beneficial effects of this invention are as follows: This testing system and method enables the testing of friction loss in various components of perfluorohexanone (PFH) fire extinguishing systems, including valves and pipe fittings. PFH extinguishing agent is reusable and cost-effective. The test flow rate and pressure are adjustable, allowing for real-time data monitoring and dynamic data acquisition. Direct use of PFH extinguishing medium ensures high data accuracy, and the measured data can be directly used in engineering application design. This testing system also features high reliability, high precision, and ease of operation. The data obtained using this invention can lay the foundation for the formulation and revision of standards and specifications, and can also be directly used in the engineering design of PFH fire extinguishing systems, demonstrating practical and widespread value. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the system structure of the present invention. Detailed Implementation

[0043] like Figure 1As shown, a perfluorohexanone valve and fitting friction loss testing system includes a sample 24, a system control pipeline section, and a data acquisition and processing section. The system control pipeline section includes an exhaust valve 1, a vacuum pump 2, a drain valve 3, a vacuum gauge 4, a gauge valve 5, a pipeline vent valve I 6, a filter I 7, a liquid tank filling valve 8, a filter II 9, a liquid tank vent valve 10, a liquid tank 11, a pipeline filling valve 12, a reciprocating pump 13, a frequency converter control cabinet 14, a rectifier tank 15, a filter III 16, a pipeline vent valve II 17, a pressure sensor 18, a data acquisition unit 19, a shut-off valve 20, a filter IV 21, a pipeline vent valve III 22, a flow meter 23, a filter V 25, a pipeline vent valve IV 26, a cleaning valve 27, an air compressor 28, and a test pipeline 29. The data acquisition and processing section includes a frequency converter control cabinet 14 and a data acquisition unit 19.

[0044] Exhaust valve 1 is used by the vacuum pump to discharge residual perfluorohexanone and gas in the pipeline; vacuum pump 2 is used to pump the perfluorohexanone tested in the pipeline back to the storage tank and to extract residual perfluorohexanone and gas in the test pipeline. The drain valve needs to be opened before starting the vacuum pump; vacuum gauge 4 is used to monitor the vacuum degree when the vacuum pump is working; gauge valve 5 is used as the on / off valve for the vacuum gauge; pipeline vent valve is used to open when injecting perfluorohexanone into the pipeline; filter is used to filter moisture in the air; air compressor 28 is used to clean the pipeline; pressure sensor 18 is used to test the pressure difference before and after the sample, and flow meter 23 is used to test the flow rate; reciprocating pump 13 is the test pump. After the reciprocating pump is turned on, the perfluorohexanone extinguishing agent circulates in the closed test pipeline; frequency converter control cabinet 14 controls the reciprocating pump, vacuum pump, and air compressor in frequency conversion or power frequency mode. The cleaning valve is used to open when cleaning the pipeline; data acquisition unit 19 is used to collect flow rate and pressure difference data.

[0045] Example 1: Test method for a perfluorohexanone valve and fitting friction loss testing system:

[0046] The first step in the test is to install the perfluorohexanone valve on the test pipeline 29 between the flow meter 23 and the pipeline vent valve Ⅳ26.

[0047] The second step is to open the pipeline vent valve I6, filter I7, filter II9, liquid storage tank vent valve 10, filter III16, pipeline vent valve II17, filter IV21, pipeline vent valve III22, filter V25, and pipeline vent valve IV26 to connect the pipeline to the outside environment and prepare for the refueling of perfluorohexanone extinguishing agent.

[0048] Third, open the pipeline filling valve 12 and add perfluorohexanone extinguishing agent to the test pipeline 29 from the storage tank 11 until extinguishing agent overflows from filters I7, III16, IV21 and V25. Then close the valves of pipeline vent valve I6, storage tank vent valve 10, pipeline vent valve III22, pipeline vent valve IV26 and pipeline filling valve 12 to ensure that the test pipeline is unobstructed.

[0049] Fourth step: Open the shut-off valve 20 to connect the pressure sensor 18 to the test pipeline 29.

[0050] Fifth step, calculate the minimum flow rate using the formula. R e = sd / (V F μ) …………………….(1)

[0051] Calculate the flow rate, 1*10 5 =S*0.05 / (0.0733*0.39), then the minimum flow velocity S in the pipeline is 5717.4m / s, and the minimum flow rate to meet the Reynolds number requirement is 0.68L / min. The reciprocating pump 13 is controlled by the frequency converter control cabinet 14 to be greater than the calculated minimum flow rate. After the perfluorohexanone fire extinguishing agent flows through the rectifier tank 15, it circulates in the test pipeline 29. The pressure sensor 18 and the flow meter 23 collect data and transmit the data to the data acquisition unit 19. The frequency of the reciprocating pump 13 is controlled by the frequency converter control cabinet 14 to adjust the test flow rate and test pressure.

[0052]

[0053] Data acquisition device 19 collected the flow rate of sample 24. Q / L / min and pressure difference p Five sets of data for each of / pa are shown in Table 1. The friction loss of the sample was calculated using the friction loss calculation formula. The actual inner diameter of the pipeline was measured with calipers before the experiment. d Then, the frequency of the reciprocating pump is adjusted by the frequency converter to make the flow rate greater than the minimum flow rate. The frequency is increased to increase the flow rate. When the value is stable, the measured flow rate and pressure difference are recorded. A total of 5 sets of data are recorded. The flow rate and pressure difference data are substituted into formula (2). L=L X -(a+b) and formula (3)

[0054] Frictional losses can be calculated (using data from item 1 in Table 1 as an example):

[0055] L = (p * 120) 1.85 *(0.05*10 3 ) 4.87 ) / (6.05*10 10 *Q1.85 ) - (1.0 + 0.5)

[0056] L=(p*7022.40*187924724.01) / (60500000000*Q 1.85 -1.5

[0057] L = 21.81 * p / Q 1.85 -1.5

[0058] L = 4.4m.

[0059] Table 1. Calculation of friction loss based on five test sets of data.

[0060]

[0061] The five sets of friction loss data in Table 1 were calculated, and then the average value was taken to obtain the following result:

[0062] (4.4+4.5+4.8+5.0+5.2) / 5=4.78m

[0063] The friction loss value is the friction loss result obtained by testing the sample with perfluoroketone fire extinguishing agent, and it is used for actual engineering design.

[0064] The method for testing friction loss of straight pipe sections and fittings shall be performed in accordance with Example 1.

Claims

1. A test method for a perfluorocyclohexanone valve pipe fitting friction loss test system, the test system comprising a test sample (24), a system control and measurement pipeline part and a data acquisition and processing part, characterized in that: The connection of the system's measurement and control pipeline is as follows: one end of the reciprocating pump (13) is connected to the rectifier tank (15), pipeline vent valve II (17), shut-off valve (20), pipeline vent valve III (22), flow meter (23), sample (24), pipeline vent valve IV (26), cleaning valve (27), drain valve (3), pipeline vent valve I (6), pipeline filling valve (12), and the other end of the reciprocating pump (13) through the test pipeline (29) to form a closed-loop pipeline; a filter III (16) is connected to the pipeline vent valve II (17), a pressure sensor (18) is connected to the shut-off valve (20), and a filter IV (21) is connected to the pipeline vent valve III (22). A filter V (25) is connected to the vent valve IV (26), an air compressor (28) is connected to the cleaning valve (27), a vacuum pump (2) and a gauge valve (5) are connected to the drain valve (3), a vacuum gauge (4) is connected to the gauge valve (5), a filter I (7) is connected to the pipeline vent valve I (6), a storage tank (11) is connected to the pipeline filling valve (12), a storage tank filling valve (8) and a storage tank vent valve (10) are connected to the storage tank (11), a filter II (9) is connected to the storage tank vent valve (10), and the storage tank filling valve (8) is connected to the vacuum pump (2) and the exhaust valve (1) through the test pipeline (29); The connection of the system's measurement and control data acquisition and processing section is as follows: the data acquisition unit (19) is connected to the pressure sensor (18) and the flow meter (23) respectively via lines; the frequency converter control cabinet (14) is connected to the vacuum pump (2), the air compressor (28) and the reciprocating pump (13) respectively via lines; the liquid storage tank (11) is equipped with liquid perfluorohexanone gas extinguishing agent; The sample (24) is a perfluorohexanone valve, straight pipe section, or fitting; The exhaust valve (1) is used by the vacuum pump to discharge residual perfluorohexanone and gas in the pipeline through the exhaust valve; the vacuum pump (2) is used to pump the perfluorohexanone that has been tested back into the storage tank in the pipeline, and to extract the residual perfluorohexanone and gas in the test pipeline. The drain valve (3) needs to be opened before starting the vacuum pump; the vacuum gauge (4) is used to monitor the vacuum level when the vacuum pump is working; the gauge valve (5) is used as the switch valve for the vacuum gauge; the pipeline vent valve is used to open the pipeline vent valve when injecting perfluorohexanone into the pipeline; the filter is used for The system filters moisture from the air; the air compressor (28) is used to clean the pipeline; the pressure sensor (18) is used to test the pressure difference before and after the sample, and the flow meter (23) is used to test the real-time flow rate; the reciprocating pump (13) is the test pump, and after the reciprocating pump is turned on, the perfluorohexanone fire extinguishing agent circulates in the closed test pipeline; the frequency converter control cabinet (14) controls the reciprocating pump, vacuum pump and air compressor in frequency conversion or power frequency mode, and the cleaning valve is used to open when cleaning the pipeline; the data acquisition unit (19) is used to collect flow rate and pressure difference data.

2. A test method using the perfluorohexone valve tubing frictional loss test system of claim 1, characterized by, The steps are as follows: The first step is to install the sample (24) on the test pipeline (29) between the flow meter (23) and the pipeline vent valve IV (26); The second step is to open the pipeline vent valve I (6), filter I (7), filter II (9), storage tank vent valve (10), filter III (16), pipeline vent valve II (17), filter IV (21), pipeline vent valve III (22), filter V (25), and pipeline vent valve IV (26) to put the pipeline in an open state. The third step is to open the pipeline filling valve (12), and add perfluorohexanone fire extinguishing agent to the test pipeline (29) through the storage tank (11) until fire extinguishing agent overflows from filters I (7), III (16), IV (21) and V (25). Then close the valves of pipeline vent valve I (6), storage tank vent valve (10), pipeline vent valve III (22), pipeline vent valve IV (26) and pipeline filling valve (12) to keep the pipeline in a closed state. Fourth step, open the shut-off valve (20) and connect the pressure sensor (18) to the test pipeline (29); The fifth step is to pre-set the test flow rate and control the reciprocating pump (13) to the set flow rate through the frequency converter control cabinet (14). The perfluorohexanone extinguishing agent flows through the rectifier tank (15) and circulates in the test pipeline (29). The pressure sensor (18) and flow meter (23) transmit the collected data to the data acquisition unit (19). The frequency of the reciprocating pump (13) is controlled by the frequency converter control cabinet (14) to adjust the test flow rate and test pressure. After the data acquisition unit (19) collects five sets of data for the flow rate Q / L / min and pressure difference p / pa of the sample (24), the friction loss of the sample is calculated according to the friction loss calculation formula to confirm whether the pressure of the sample (24) meets the requirements. During the test, the turbulent flow in the pipeline should be ensured, so that the Reynolds number is greater than 1*10 5 According to the Reynolds number calculation formula, the minimum Reynolds number 1*10 5 Substitute the minimum Reynolds number 1*10 into the Reynolds number calculation formula to calculate the minimum flow during the test; Step 6: After the test is completed, open the drain valve (3), vacuum gauge (4), gauge valve (5), vacuum pump (2), and liquid filling valve (8) of the storage tank to return the perfluorohexanone extinguishing agent to the storage tank (11), and open the exhaust valve (1) to exhaust the gas. The seventh step is to use the frequency converter control cabinet (14) to control the cleaning valve (27) and the air compressor (28) to purge the pipeline; After the test, the sample (24) was reinstalled for the next test.

3. The method of claim 2, wherein the method further comprises: The minimum flow rate at the time of the test is calculated in Step 5, and the Reynolds number is made greater than 1*10 5 , and the flow in the pipe is turbulent. The Reynolds number R is calculated according to formula (1) e , R e = s d / (V F μ)……………………….(1) In the formula s—the flow rate of perfluorohexanone in the pipeline, m / s; d—actual inner diameter of the pipe, in meters; V F - specific volume of perfluorohexanone, m 3 / kg; μ—Dynamic viscosity of perfluorohexanone, kg / m∙s.

4. The method of claim 2, wherein: The formula for calculating friction loss mentioned in step five is as follows: Calculate the equivalent length L according to equations (2) and (3); L = L X (a + b) (2) ..............（3） In the formula L—friction loss, m; Lx—frictional loss between the sample and the test pipe, in meters; P—pressure difference, Pa; d—actual inner diameter of the pipe, in meters; c—Measures the roughness coefficient of the pipeline; 120 is used for galvanized pipes. Q—Water flow rate, L / min; a—Distance from the front end of the differential pressure gauge to the sample, in meters; b—Distance from the differential pressure gauge to the rear end of the sample, in meters.

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