JB/T 6892-1993 Reciprocating piston oxygen compressor performance test method
Some standard content:
J76 | | tt | | JB | -07-13 Published
Ministry of Machinery Industry of the People's Republic of China
Published
Implemented on 1994-07-01
Machinery Industry Standards of the People's Republic of China
Reciprocating Piston oxygen compressor
Performance test method
This standard refers to the international standard ISO1217-1986 (E) "Displacement Compressor - Acceptance Test". 1 Subject content and scope of application
JB/T6892-93
This standard specifies the performance test methods of reciprocating piston non-lubricated oxygen compressors (hereinafter referred to as oxygen compressors) and the volumetric flow rate of oxygen compressors and the measuring plate of the required power and the method of converting the measured values ??to the performance values ??under specified working conditions. This standard applies to type testing and acceptance testing of oxygen compressors. 2 Reference standards
The first part of the flow measurement throttling device is the corner joint pressure taking, flange pressure taking standard orifice plate and corner joint pressure taking standard GB2624
quasi-nozzle
GB3853
Performance test method for general positive displacement air compressor GB4975 Positive displacement compressor terminology
3 terms and definitions
3.1 Fluorine compressor
Provided by the manufacturer Oxygen compressor unit, which includes all internal piping and auxiliary components and other accessories necessary for the operation of the main engine.
3.2 The terms involved in this standard are subject to the provisions of GB4975. Measuring instruments and measurement methods
4
4.1 Temperature measurement
4.1.1 Qualified or calibrated instruments should be used to measure temperature, such as glass rod mercury thermometers, thermoelectric meters, resistors Thermometer or thermal resistance thermometer.
4.1.2 The accuracy of gas and cooling water inlet thermometers is ±0.2°C. The gas thermometer in front of the flow measurement device has an accuracy of ±0.2C. 4.1.3
The inlet and exhaust temperatures are measured close to the cylinder inlet and exhaust flanges, generally no more than twice the pipe diameter. 4.1.4
The thermometer tube must be thin-walled and small in diameter, and appropriate liquid should be injected into the casing. 4.1.5
The thermometer or casing should be sown into the pipe at a depth of 100mm or one-third of the pipe diameter, whichever is smaller. If the pipe diameter is small, the 4.1.6
decay pipe should be inserted obliquely.
The thermometer cannot be taken out from the measured medium (or casing) when reading. 4.1.7
4.1.8 The number of the thermometer should be corrected according to formula (1): t=t +L a(t, -tu)
where
f,
Real temperature, ℃:
Actual thermometer reading, ℃;
Approved by the Ministry of Machinery Industry 1993-07-13
1
1994-07- 01Implementation
1
JB/T 6892--93
The scale value of a exposed liquid column, which is equal to the reading difference between the casing mouth and the top of the liquid level in the capillary tube, ℃ : Thermometer liquid expansion coefficient (for mercury, g=1/6300); t----the average temperature of the exposed liquid column (read by the auxiliary thermometer), ℃. 4.1.9 Notes:
a.
b.
c.bzxz.net
4. 1.10
4.2
Near the insertion point Or the extended part of the joint should be well insulated so that the temperature of the casing and the medium being measured are the same. The temperature-sensing portion of any temperature measuring device or bushing should be well swept by the gas. The thermowell should not interfere with normal air flow. The hot end of the thermocouple should be welded and calibrated within a predetermined range along with the hot end wire. Pressure measurement
4. 2. 1
4. 2. 2
4.2.3
4. 2. 4
in pipes or containers The pressure tap should be flush with the inside wall. The pressure gauge pipe should be as short as possible, and a sealing test should be performed to prevent leakage. The inner diameter of the pressure gauge pipe should be greater than or equal to 6mm. Measuring instruments should be installed in appropriate locations to avoid harmful vibrations. When calibrating the pressure gauge, the pressure and temperature conditions of the test should be calibrated. 4.2.5
The liquid column reading should be corrected for the ambient temperature. 4.2.6
In the case of low (less than 1Hz) pulsating air flow, a buffer with an inlet orifice should be set between the pressure measuring joint and the pressure gauge. 4. 2. 7
device.
4.2.8 When the pressure is lower than or equal to 0.2MPa, the inner diameter of the barometer or liquid column differential pressure meter for measuring low pressure should be greater than or equal to 10mm; the inner diameter of the double-tube type should be greater than or equal to 6mm; the inner diameter of the differential pressure gauge for measuring scene flow should be greater than or equal to 12mm, and the resolution is 1mm.
Note: Unless otherwise indicated in this standard, pressure refers to the absolute average static pressure. 4.2.9 A barometer with an accuracy of not less than 1 hPa should be used to measure atmospheric pressure. If a mercury barometer is used, a thermometer with an accuracy of ±1°C should be used to indicate the operating temperature of the barometer, and the barometer reading should be corrected accordingly. 4.2.10 When the pressure is higher than 0.2MPa, calibrated spring tube pressure gauges, mercury pressure gauges or other equivalent instruments can be used.
4.2.11 According to the size of the pressure to be measured, select the range of the pressure gauge so that the indicated value is between 1/3 and 2/3 of the full scale. The accuracy of the pressure gauge is specified in Table 1,
Table 1
Pressure measurement part
Air storage seam pressure
Exhaust pressure at all levels
Pressure in front of the nozzle
Lubricating oil pressure||tt| |Pressure gauge accuracy level (not less than)
1.5
0. 4
0.4
1.5
level
4.2.12 The suction pressure is measured at the standard suction position. The size and shape of the suction pipe used for the test should be the same as the actual installation of the product. 4.2.13 The air flow resistance of the intercooler is measured with a differential pressure meter. 4.2.14 The exhaust pressure pressure measuring joint should be close to the standard exhaust position of the oxygen compressor. 4.3 Flow measurement
4.3.1 The flow measurement device and its requirements shall be in accordance with the provisions of GB2624. 4. 3. 2
, When the exhaust volume is small and the measurement accuracy is not high, the flow rate can also be measured according to the provisions of Appendix A (Supplement) of GB3853.
4.4 Power measurement shall be carried out in accordance with Article 2.6 of GB3853. 4.5 Speed ??measurement should use a tachometer with a stopwatch, a photoelectric tachometer or other measuring instruments. The relative error of measurement should not be greater than 2
4.3 Flow measurement
JB/T 6892-1993
4.3.1 Flow measurement device and its requirements are in accordance with GB2624. 4.3.2 For cases where the exhaust volume is small and the measurement accuracy is not high, the flow rate can also be measured according to the provisions of Appendix A (Supplement) of GB3853.
4.4 Power measurement shall be carried out in accordance with Article 2.6 of GB3853. 4.5 Speed ??measurement should use a tachometer with a stopwatch, a photoelectric tachometer or other measuring instruments. The relative error of measurement should be no more than ±0.2%.
4.6 The cooling water flow rate can be measured with a container with a known volume and a stopwatch; or it can be measured with a calibrated flow meter; it can also be measured with an orifice plate or nozzle designed and manufactured in accordance with GB2624. The relative error of cooling water flow measurement should be controlled within the range of ±2%. 5 Test Methods
5.1 General Principles
5.1.1 The test conditions for the oxygen compressor performance test should be consistent with the specified working conditions stipulated in the product standards or the working conditions agreed between the supplier and the buyer (hereinafter collectively referred to as the specified working conditions) Try to keep it as consistent as possible, and the deviation should not exceed the range specified in Table 2. Table 2
Between test value and specified value
Operating parameters
Suction pressure
Total pressure ratio
Suction temperature
Spindle Rotation speed
The temperature difference between the suction temperature and the inlet
cooling water temperature
cooling water flow rate
temperature in front of the nozzle or orifice plate
Pressure difference
Voltage
Power frequency car
Maximum allowed relative deviation
(or deviation)
±1.0%
± 3.0 %
±8℃
±10%
± 5%
± 1%
A set of readings for any parameter
Relative to the average value
maximum allowable fluctuation range
± 0.5%
±1℃
± 1.0%
±1.0℃
± 3.0%
±2℃
±2%
± 5%
5.1.2 As the medium for the performance test, if there is no special agreement between the supplier and the buyer, oil-free dry air is allowed. When the test working conditions meet the requirements in Table 2, the performance parameters of the oxygen compressor under the specified working conditions shall be tested and calculated according to the provisions of this standard. 5.1.3
5.1.4 When the test conditions cannot be stabilized within the range specified in Table 2, the specific test conditions and specific correction methods shall be agreed upon by the supplier and the purchaser. 5.1.5 When the deviation or fluctuation range of individual parameters in the test working conditions exceeds the requirements in Table 2, under the condition that only the parameter is changed, perform stable operation and test respectively, so that the correction amount to the specified working conditions can be determined by Determined by interpolation. 5.1.6 The test gas circuit system of the oxygen compressor adopts a closed-circuit circulation method. Take the three-stage compression oxygen compressor test system as an example, as shown in the figure below. 5.1.7 All testing instruments and meters should comply with the provisions of corresponding standards and be certified by the metrology department. 5.1.8 Before the test, all equipment, connecting pipes, pressure measuring heads and temperature measuring points in the test system should be checked for tightness; all possible scaled areas should be cleaned.
3
Wenpi
most
pressure
?
cable exhaust humidity
busy air pressure| | tt | |Gas tank
5.2 reading and identification
JB/T6892-1993
Temperature seat
Gauge cooler
Year
Quantity
Unfinished exhaust temperature
Supplementary gas
Final cooling device
Empty
support
hard mouth rear pressure Before spraying, the pressure increases before spraying and the degree clears
Test system diagram
Resistance cost study
(or constant flow hole)
5.2.1 Read data Before operation, the oxygen compressor should be operated for a long enough time to ensure stable working conditions. Stimulated vortex
5.2.2 When the test conditions change irregularly, or individual readings change too much, the number of readings should be increased. 5.2.3 Each parameter in the performance test should have sufficient readings, and the number and interval of readings should be able to ensure the accuracy of the test. 5.2.4 Only at the beginning or end of the test, readings that exceed the fluctuation range can be deleted; each set of readings should be taken at the same time as much as possible.
5.2.5 Before the final calculation, it should be reviewed whether the recorded data is consistent with the operating conditions, and whether the fluctuation range is within the range specified in Table 2. 5.3 Calculation of test results
5.3.1 In addition to flow measurement, the test results should be calculated based on the arithmetic mean of the approved readings. 5.3.2 Convert the gas volumetric flow rate measured by the flow measuring device into the volumetric flow rate under standard air intake conditions. 6 Correction of test results
When the test operating conditions deviate from the specified operating conditions within the range specified in Table 2, the flow rate and shaft power should be corrected according to the following correction methods provided by this standard to obtain the oxygen compressor in the specified range. performance parameters under working conditions. 6.1 Correction of volumetric flow
6.1.1 Speed ??correction coefficient is calculated according to equation (2): K,=nJng
where: K
ne
ne|| tt||Rotation speed correction coefficient:
—the speed specified in the design, r/min;
the speed actually measured in the test, r/min.
6.1.2 The cooling water inlet temperature correction coefficient of volumetric flow rate is calculated according to equation (3): 4
(2)
where: K-
JB/ T6892—1993
K=1+(k-)-
fetg
O
cooling water inlet temperature correction coefficient for one volume flow rate; change the cooling water inlet temperature The actual volume flow rate after the test, mhOk - the actual volumetric flow rate under the test condition, m\/h; fe
fr
- the cooling water inlet intensity under the specified working condition, ℃; - the test condition The cooling water inlet temperature of the condition, ℃: - The cooling water inlet temperature after the change, ℃. 6.1.3 The actual volumetric flow rate under the specified working conditions after correction is calculated according to formula (4): [9]= K,K2r
Where: [2] --- The actual volume under the specified working conditions after correction Flow rate, m/h. 6.2 Axis power correction
6.2.1 Suction pressure and total pressure ratio correction coefficients are calculated according to equation (5): Ky=Pielgr
Pre Igre
Where: K,|| tt||Ple
PiR
r.
Suction pressure and total pressure ratio correction coefficient: suction pressure under specified working conditions, Mpa;
Test working conditions Suction pressure, MPa;
is the total pressure ratio under specified working conditions:
is the total pressure ratio under test conditions.
When the total pressure ratio during the test deviates from the specified working conditions by no more than 0.5%, the correction coefficient K is calculated according to equation (6): K,=Ple/piR
6.2.2 Shaft power The cooling water inlet temperature correction coefficient is calculated according to equation (7): NN
K, =1+ (:
NR
where: K
Ng||tt ||Ng
The cooling water inlet temperature correction coefficient of the shaft power: the shaft power after changing the cooling water inlet temperature, kW: - the shaft power under the test condition, kW
the specified working condition after correction. The shaft power under the condition is tested according to formula (8): 6.2.3
[M] = K,K,KN
where: [M-the shaft power of the specified working condition after correction, kW. 6.3 The corrected actual volumetric specific energy is calculated according to formula (9): [g] =[MO]
In the formula: [9]-
The corrected actual volumetric specific energy, kW·h /m2. te-t
te -tr
(3
(4)
(5)
(6)
(7)
(8)
(9)
A1
JB/T68921993
Appendix A
Simplified performance test|| tt | Measure the exhaust volume and volume specific energy of the oxygen compressor to verify whether it meets the results of the prototype performance test
The deviation between the allowed operating parameters and the specified value during the A2 simplified test and the fluctuation of the operating parameters during the test. The range is specified in Table AI. Table A1
Between test value and specified value
Operating parameters
Suction pressure
Total pressure ratio
Suction temperature
Spindle speed
The temperature difference between the suction temperature and the inlet cooling water temperature, the cooling water flow rate
The temperature in front of the nozzle or plate
The pressure difference in the nozzle or orifice plate||tt ||Voltage
Power frequency
A3
Maximum allowed relative deviation
(or deviation)
± 2.0%
±4.0 %
±10℃
± 8%
±3%
A set of readings for any parameter
relative to the average value|| tt||Maximum allowable fluctuation range
± 1.0%
±2℃
± 1.0%
±2℃
±5.0%||tt ||±2℃
± 2%
± 1.0%
The instrument used in the simplified test, the instrument accuracy is specified in Table A2: Items not included in the table are subject to this According to Chapter 4 of the standard. When the relative deviation between the volume flow volume ratio energy value obtained by the simplified test and the measured value of the prototype performance test does not exceed the provisions of Table A3A4
, the tested oxygen compressor is deemed to meet the performance measurement of the prototype. result. Table A2
Measurement items
Gas tank pressure
Interstage suction pressure
Discharge pressure
Suction temperature
Nozzle or orifice temperature
Cooling water humidity
Exhaust temperature
6
Instrument
Pressure gauge
Thermometer||tt| |Accuracy
Not less than level 2
Not less than level 1.5
Not less than level 1
±0.5℃
±2℃
Shaft power of oxygen compressor at rated load
kw
<10
10 ~100
>100
JB/T6892-93
Table A3
Ruiji Flow
±6
±5|| tt ||±4 | ②The deviation values ??in the table include performance test (type test) deviation, manufacturing deviation and measurement deviation of chemical test. Volume specific energy
±7
±6
±5| | tt | And compliance with the provisions of Table A3 can be used as the basis for the product to be qualified. Additional notes:
This standard is proposed and administered by the Hangzhou Chlorine Machine Research Institute of the Ministry of Machinery Industry. This standard is drafted by Hangzhou Chlorine Making Machine Research Institute. The main drafters of this standard are Peng Zhenkang, Yu Yongle, Zhu Ronxiong, and Zhao Yanji.
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