SY/T 5641-2000 190 series natural gas engines for petroleum and natural gas industries
Some standard content:
ICS 75.180.01
Registration number: 8150—2001
Petroleum and natural gas industry standard of the People's Republic of ChinaSY/T 5641—2000
Series 190 natural gas engine for the petroleum and natural gas industry2000 - 12 — 12 Release
State Administration of Petroleum and Chemical Industry
2001－ 06－01 Implementation
SY/T 5641-2000
2 Reference standards
3 Definitions
4 Product classification
5 Technical requirements
6 Test methods
7 Inspection rules.
8 Delivery acceptance
9 Marking, packaging, transportation and storage
10 Warranty period
Appendix A (Appendix to the standard) Names of main parts of natural gas engines
Appendix B (Appendix to the standard) Measurement locations, measuring instruments and accuracy of some parameters of natural gas enginesAppendix C (Appendix to the suggestion) Information to be provided by the natural gas engine purchaser++
SY/T 5641—2000
Based on the original standard SY5641-93 "Natural Gas Engines for Oil Mines", this revision proposes the types and main technical parameters of 190 series natural gas engines including 12 cylinders, 8 cylinders, 6 cylinders, 4 cylinders, double cylinders, single cylinders, etc., and adds the quality requirements of natural gas: and makes specific provisions for performance indicators such as emissions, noise, and oil consumption rate, making the standard more complete and more operational. The revised standard is named "190 Series Natural Gas Engines for Oil and Gas Industry". This standard will replace SY5641-93 from the date of entry into force. Appendix A and Appendix B of this standard are appendices to the standard, and Appendix C is a reminder appendix. This standard is proposed and managed by the National Technical Committee for Standardization of Petroleum Drilling Equipment and Tools. This standard was drafted by: Jinan Diesel Engine Factory, Shengli Power Machinery Factory. The main drafters of this standard are Wang Anzhong, Qu Yuling, Li Shusheng, Mi He, Xu Chuanguo, Zhu Xue. The "Cost Standard" was first issued on February 7, 1990, and was rectified from a professional standard to an industry standard in March 1993. This is the first revision.
1 Scope
Petroleum and Natural Gas Industry Standard of the People's Republic of China SY/T 5641--200-0
190 Series Natural Gas Engine for the Petroleum and Natural Gas Industry Replaces SY5641-93
Series 190 Natural Gas Engine for the Petroleum and Natural Gas Industry This standard specifies the product classification, technical requirements, test methods and inspection rules of the 190 Series Natural Gas Engine for the Petroleum and Natural Gas Industry (referred to as Natural Gas Engine).
This standard is applicable to large natural gas engines with a power of 25 to 660kW, and serves as the basis for design, manufacturing, ordering and delivery acceptance. 2 Cited standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB191—1990 Pictorial marking for packaging, storage and transportation
GB/T1105.2—1987 Internal combustion engine bench performance test method Test method GB/T1105.3—1987 Internal combustion engine bench performance test method Measurement technology GB/T3821--1983 Cleanliness determination method for small and medium power internal combustion engines GB/T4556—1999 Fire protection of reciprocating internal combustion engines GB/T7184—1987 Measurement method for small and medium power diesel engines GB/T8190.4-1999 Reciprocating internal combustion engines, exhaust gas Emission measurement Part 4: Test cycles for engines of different purposes GB/T8194-1987 Determination of sound power level of internal combustion engine noise Engineering method and simplified method GB/T9486-1988 Diesel engine steady-state exhaust smoke and its determination method GB/T11060.2-1998 Determination of hydrogen sulfide content in natural gas Methylene blue method GB/T11061-1997 Determination of total sulfur content in natural gas Oxidation microcoulometric method GB/T11062-1998 Calculation method for calorific value, density, relative density and Wobbe index of natural gas GR 11122—1997 Diesel engine oil
GB/T13610—1992 Composition analysis of natural gas Gas chromatography GB./T 15371—1994 Measurement and evaluation method for torsional vibration of crankshaft shaft system JB/I9772.2—1999 Bench test method for gas engine 3 Definitions
This standard adopts the following definitions.
Natural gas engine natural gas
A reciprocating internal combustion engine using natural gas as fuel is called a natural gas engine. 4 Product classification
4.1 Type
The structural type of natural gas engine is as follows:
Approved by the State Administration of Petroleum and Chemical Industry on December 12, 2000, implemented on June 1, 2001
a) Number of strokes: four strokes;
b) Cooling method: forced water cooling;
SY/T5641-2000
c) Starting method: compressed air starting or electric starting; d) Cylinder arrangement: V-shaped 60° angle or inline; e) Intake method: exhaust gas turbocharger (intercooler or without intercooler) or naturally aspirated. 4.2 Rated working conditions
4.2.1 Rated power
The rated power of natural gas engine is the single machine 12h power or continuous power. When required, the 1h and 15min power can also be calibrated, and it should be stated in the relevant technical documents.
4.2.2 Rated speed
The rated speed of natural gas engine is stipulated as follows: a) 1500r/min;
b) 1200r/min;
e) 1000r/min;
d) 850r/min;
e) 750r/min.
When there is a special need, it can be in accordance with the contract provisions
4.2.3 Standard environmental conditions
a) Atmospheric pressure: po=100kPa;
b) Ambient temperature: To=25℃;
e) Relative humidity: @o=30%;
d) Intercooler inlet water temperature:
To-25℃.
4.2.4 Natural gas quality indicators
a) High calorific value is not less than 31.4M/m
b) Total sulfur (in terms of sulfur) content is not more than 460mg/m; c) Hydrogen sulfide content is not more than 20mg/m;
d) Natural gas is treated to have no liquid components; the impurity particle size in natural gas is less than 5um, and the content is not more than 30mg/m3; e) The volume fraction of methane content is not less than 76%. Note
1 The standard reference condition for natural gas volume is 101.3kPa, 20℃. 2 Methane content is only used as a reference indicator.
4.3 Basic parameters
The basic technical parameters of 190 series natural gas engines are specified in Table 1. Table 1 Basic technical parameters of 190 series natural gas engines No.
Parameter name
Cylinder diameter
Piston stroke
Parameter value
Parameter name
Number of cylinders and arrangement
Rated speed
i2h powerwww.bzxz.net
Continuous power
Minimum no-load stable speed
Maximum torque
Average piston speed
Total displacement
Compression ratio
Direction of rotation
Ignition advance angle (before top dead center)
Ignition mode
Ignition sequence
SY/T5641—2000
Table 1 (End)
660*)
Parameter value
360)
300*)
4 cylinder engine
8:1 or 9:1
Counterclockwise (looking at the output end)
12 cylinder: 15
810711912
Spark plug ignition
8 cylinder: 1
6 cylinder: 153
4 cylinder: 124-3
1Valve timing, valve clearance, mean effective pressure, maximum explosion pressure, overall dimensions, net weight and other parameters are given in the manufacturer's technical documents.
2) with ★ is a supercharged natural gas engine
4.4 Model compilation method
4.4.1 The method for compiling natural gas engine models is as specified in Figure 1. 3
4.4.2 Model examples:
SY/T 5641—2000
Fuel code:
T—Natural gas
Distinguishing symbol (calibration ball code or
deformation code is determined by the manufacturer)
Y—Compressed natural gas
State code:
No code—City-driven drilling rig, general
D—Electric-driven drilling rig, power generation
G—Other petroleum engineering machinery
C—General
J—Locomotive
Note: When using a general performance structure, the use code is marked with Arabic numerals in the lower corner of the rock. Applicable area code:
Sky code—One stock area
H—Desert area
Y—Highland area
H—Offshore platform
Code for structural characteristics:
No code - naturally aspirated
Z - supercharged
Z - supercharged, intercooled
N - condensed gas waiting to cool
Cylinder diameter: 190
Code for cylinder arrangement:
V-shaped arrangement
L - a straight line (omitted)
Number of cylinders:
Expressed by Arabic numerals
Product characteristic generation or replacement code (given by the manufacturer): No code - basic type
Figure 1 Method for compiling natural gas engine models
a) 12V190ZTT-2 is a natural gas engine with 12 cylinders, V-shaped arrangement, cylinder diameter of 190mm, supercharged, suitable for general areas, power generation, 1000r/min.
SY/T 56412000
b) 12V1907GT-2 is a 12-cylinder, V-type arrangement, cylinder diameter 190mm, supercharged, general area, industrial use, 1000r/min natural gas engine.
c) G6190ZT2 is an improved, 6-cylinder, in-line, cylinder diameter 1901rt1, supercharged, general area, 1000r/min natural gas engine.
5 Technical requirements
Natural gas engine products shall be manufactured according to product drawings and technical documents approved by the prescribed procedures, and shall comply with the provisions of this standard. 5.1 Starting performance
When the ambient temperature is greater than 5℃, the natural gas engine shall be able to start smoothly within 10s; when the ambient temperature is within the range of -40～+5℃, the engine oil and cooling water shall be able to start smoothly after preheating. 5.2 Temperature and pressure under nominal working conditions
The temperature and pressure parameters under nominal working conditions are shown in Table 2. Table 2 Overflow and pressure under nominal working conditions
Main temperature and pressure parameters
Exhaust temperature
Oil temperature
Cooling water outlet overflow
Oil pressure in main oil channel
Natural gas pressure (absolute pressure)
5.3 Power and its deviation
400~800
Cylinder number
450-800
300~-600
250--500
When the natural gas engine is running under standard environmental conditions, it should be able to issue the nominal power specified on the nameplate: its deviation is +5%. 5.4 Heat rate and oil consumption rate of natural gas engine The heat rate and oil consumption rate of natural gas engine shall comply with the provisions of Table 3, and the maximum deviation of heat rate shall not exceed 5% of the specified value. Table 3 Heat rate and oil consumption rate
Consumption parameters
Heat rate
MI/(kw-h)
Oil consumption rate (factory status)
g/ (kw-h)
5.5 Correction of power and heat rate
Number of cylinders
5.5, 1 When the test environment does not conform to the standard environment conditions, the power and heat rate shall be corrected according to the method specified in JB/T9772.2. 5.5.2 If there is any difference between the natural gas used in the test and the natural gas quality indicators specified in this standard, it can be accepted according to the technical agreement agreed upon by the supply and demand parties.
5.6 Characteristic curve
SY/T5641—2000
The manufacturer shall provide necessary characteristic curves according to the purpose of the natural gas engine, such as load characteristic (or speed characteristic) curve, universal characteristic curve, etc.
5.7 Speed regulation performance
The various indicators of speed regulation performance of the natural gas engine under the calibrated working conditions shall not exceed the provisions of Table 4. Table 4 Speed regulation performance
Steady-state characteristics
Speed regulation level
Evenness of each cylinder
Stable speed regulation rate
Speed fluctuation rate
Instantaneous speed regulation rate
When the natural gas engine is running under the calibrated working conditions, the unevenness of the exhaust temperature of each cylinder shall not exceed 8%. 5.9 Exhaust smoke density
The exhaust smoke density of natural gas engines shall not exceed 0.8FSU5.10 Emissions
The pollutant emissions of natural gas engine exhaust shall comply with the following provisions: a) Carbon monoxide (CO) shall not exceed 12.3g/(kW-h); b) Hydrocarbons (HC) shall not exceed 2.6g/(kW·h); e) Nitrogen oxides (NOx) shall not exceed 15.8g/(kW·h). 5.11 Cleanliness
The cleanliness limits of natural gas engines are as follows: a) 12-cylinder engines shall not exceed 2400mg;
b) 8-cylinder and 6-cylinder engines shall not exceed 2000mg;
c) Other models shall not exceed 1000mg.
5.12 Noise
When the natural gas engine is operating under the calibrated working conditions, the noise sound power limit shall be in accordance with the provisions of Table 5. Table 5 Noise limit
≥25~40
>40~63
>63-100
>100~160
>160-250
>250400
>400~500
Dynamic characteristics
Stabilization time
5.13 Vibration
>500630
>630~800
>800~1000
SY/T5641—2000
Table 5 (End)
db (A)
The equivalent vibration intensity of the natural gas engine (without vibration isolation) when operating under the calibrated working conditions shall not exceed 11.2mm/s5.14 Sealing
Gas engine sealing surfaces and pipe joints shall not be allowed to leak air, oil or water. 5.15 Other performance
The minimum stable working speed, mechanical efficiency, torsional vibration, thermal balance, etc. of the natural gas engine shall be specified in the relevant technical documents of the product.
5.16 Reliability
The reliability test results of the natural gas engine shall meet the following requirements: a) The average working time before the first failure shall not be less than 500h; b) The average time between failures shall not be less than 500h; c) The life of the first overhaul is 18,000h.
5.17 Durability
The durability test results of natural gas engines shall meet the following requirements: a) There is no damage to the main parts, and their names are shown in Appendix A (Appendix to the standard); b) The wear value of the main parts shall meet the requirements of the product technical documents; c) The heat consumption rate shall not increase by more than 5% compared with that before the durability test; d) The oil consumption rate shall not increase by more than 30% compared with that before the durability test: e) No more than 5 non-main parts are damaged;
f) The failure shutdown shall not exceed 4 times;
) Other performance indicators shall meet the requirements of this standard. 5.18 Safety devices
When the natural gas engine is equipped with the following safety protection devices, the following requirements shall be met: a) Low oil pressure automatic shutdown device: When the pressure of the main oil channel of the natural gas engine is lower than the value specified in the product technical documents, the low oil pressure automatic shutdown device shall be able to automatically cut off the natural gas source, automatically disconnect the ignition system or force the natural gas engine to stop. b) Overspeed parking device: When the speed reaches 112%~118% of the rated speed, the overspeed safety device should be able to automatically cut off the natural gas source, or automatically disconnect the ignition system, forcing the natural gas engine to stop automatically within 35 seconds. c) Fire and explosion prevention:
1) The fire prevention of natural gas engines should comply with the relevant provisions of GB/T4556; 2) An explosion-proof solenoid valve that can quickly shut off the natural gas should be installed on the main natural gas supply pipeline of the natural gas engine. d) The natural gas engine equipped with a generator set should be equipped with an audible and visual alarm device; when the water outlet temperature, oil temperature, main oil channel oil pressure, natural gas pressure, etc. of the natural gas engine exceed the specified range, an audible and visual alarm should be able to sound. 5.19 Timing device
The natural gas engine should be equipped with a timer.
5.20 Requirements for use in special areas
sY/r 5641—2000
5.20.1 Natural gas engines used in deserts should be equipped with wind and sand protection devices. 5.20.2 Marine natural gas should have anti-corrosion measures and other capabilities to adapt to the marine working environment. 5.21 Surface paint layer
The surface paint layer of the natural gas engine should be firm, even and bright, without any defects such as wrinkling and peeling. 5.22 Oil seal
Under the conditions of transportation and storage in accordance with relevant regulations, the validity period of the oil seal of the natural gas engine and its accessories and spare parts shall not be less than 12 months from the date of delivery.
6 Test method
6.1 Test conditions
6.1.1 During the test, the measurement accuracy of some parameters of the natural gas engine shall comply with the provisions of Table 6; the measurement position, measuring instrument and its accuracy are shown in Appendix B (Appendix to the standard); other parameters shall comply with the provisions of GB/T1105.3. Table 6 Measurement accuracy
Natural gas pressure
Natural gas temperature
Natural gas density
Natural gas engine heat rate
Natural gas consumption
Natural gas consumption rate
Ignition advance angle
kj/ (kw-h)
m/(kw·h)
6.1.2 The manufacturer's technical documents and relevant standards and their specified attachments shall be available. 6.1.3 The engine oil used for the test shall comply with the provisions of GB 11122, accuracy
6.1.4 When the natural gas engine is running under the calibrated working conditions, the temperature and pressure of its engine oil and cooling water shall comply with the provisions of 5.2. 6.2 Inspection of ignition advance angle
The inspection of ignition advance angle can be carried out in a static state according to the conventional method, and its operation method shall be in accordance with the product manual. Before adjustment, the natural gas valve and ignition switch should be closed to ensure that the engine is running without ignition. 6.3 Air-fuel ratio adjustment test
The appropriate air-fuel ratio of the natural gas engine is determined through the test. The maximum explosion pressure and exhaust temperature should be specified during the test, and the heat rate curve of the natural gas engine should be drawn. The test conditions are in accordance with the calibration conditions. 6.4 Starting performance test
The natural gas engine is started in a cold state. When the ambient temperature is not less than 5°C, it is started twice in succession, with an interval of not less than 2 minutes each time, and the time for each start is not more than 10 seconds. There should be at least two successes. When the motor is used for starting, the time is counted from the time the motor is turned on until the natural gas engine runs automatically: when compressed air is used for starting, the time is counted from the action of the compressed air switch until the natural gas engine runs automatically. 6.5 Load characteristics and speed characteristics test
6.5.1 Load characteristics
When the speed remains unchanged, change the load of the natural gas engine and measure the main performance parameters of different load conditions. -8
The test method is in accordance with the provisions of GB/T1105.2. 6.5.2 Speed characteristics
SY/T5641—2000
When the fuel supply mechanism of the natural gas engine remains unchanged, measure the law of the change of each main performance parameter of the natural gas engine with the speed change. The test method shall comply with the provisions of GB/T 1105.2. 6.6 Speed regulation performance test
6.6.1 Stable speed regulation
When the natural gas engine is operated under the calibrated conditions, first unload all loads to make its speed reach the highest no-load speed, then gradually increase the load and restore the original calibrated conditions. Measure the stable speed before and after the load change, and then calculate the stable speed regulation according to the method specified in GB/T1105.2.
6.6.2 Instantaneous speed regulation
When the natural gas engine is operated stably under the calibrated conditions, then suddenly unload all loads or operate stably at the highest no-load speed, then suddenly add part of the load, measure the relationship between the speed and time, and then calculate the instantaneous speed regulation according to the provisions of GB/T1105.2. 6.6.3 Speed fluctuation rate
The natural gas engine is operated under the calibrated conditions and operates stably for 2 minutes. After measuring the maximum speed or minimum speed during this time, the speed fluctuation rate is calculated according to the method specified in GB/T1105.2. 6.7 Universal characteristic test
Measure the relationship between the main performance parameters of the natural gas engine when it is operated under various conditions, determine the comprehensive economy of the natural gas engine under various working conditions and draw the universal characteristic curve.
The test method is in accordance with the provisions of GB/T1105.2
6.8 Rated power working stability test
Determine the stability of various performance parameters of the natural gas engine when it is operated under the calibrated working conditions. During the test, the natural gas engine with a calibrated power of 12h power is operated continuously for 12h under the calibrated working conditions to measure the stability of the main performance parameters of the natural gas engine (measured every 1h). The natural gas engine with rated power of continuous power is operated continuously for 24 hours under the rated working conditions.
6.9 Test for uniformity of each cylinder
Measure the uniformity of each cylinder when the natural gas engine is operating under the rated working conditions, and measure the unevenness of the exhaust temperature. The test method shall be carried out in accordance with the provisions of (H/1105.2. 6.10 Load characteristic test
Determine the relationship between the heat consumption rate of the natural gas engine and the speed when the natural gas engine is idling. During the test, the natural gas engine is not loaded, and the speed is reduced from the highest no-load speed to the lowest no-load stable speed. The relevant data of each stable speed are measured respectively, and the no-load characteristic curve is drawn. 6.11 Minimum no-load stable speed measurement
The natural gas engine is tested for the minimum no-load stable speed with a dynamometer. During the test, the position of the speed control handle is gradually adjusted. Reduce the speed, measure the minimum speed and speed fluctuation value of the stable operation of the natural gas engine, and at this speed Stable operation for no less than 5 minutes6.12 Determination of minimum stable working speed
During the test, the fuel supply control mechanism of the natural gas engine is kept at the maximum power position adjusted at the factory, and the load is gradually changed to reduce the speed to the minimum stable working speed, and it can operate stably at this speed. 6.13 Determination of mechanical efficiency
The test method shall be carried out in accordance with the provisions of GB/T1105,2. 6.14 Thermal balance test
During the test, the natural gas engine is operated under the calibrated working conditions. In addition to measuring the main performance indicators, all parameters related to thermal balance should also be measured.
6.15 Noise measurement2. Calculate the stable speed regulation rate by the method specified in GB/T1105.2.
6.6.2 Instantaneous speed regulation rate
The natural gas engine operates stably under the calibrated working conditions, then suddenly unloads all loads or operates stably at the highest no-load speed, then suddenly adds part of the load, and measures the relationship between the speed and time, and then calculates the instantaneous speed regulation rate according to the provisions of GB/T1105.2. 6.6.3 Speed fluctuation rate
The natural gas engine operates under the calibrated conditions and operates stably for 2 minutes. After measuring the maximum speed or minimum speed during this time, calculate the speed fluctuation rate according to the method specified in GB/T1105.2. 6.7 Universal characteristic test
Measure the relationship between the main performance parameters of the natural gas engine when it operates under various conditions, determine the comprehensive economy of the natural gas engine under various working conditions and draw the universal characteristic curve.
Test method is in accordance with the provisions of GB/T1105.2
6.8 Rated power working stability test
Determine the stability of various performance parameters of the natural gas engine when it is running under the rated working conditions. During the test, the natural gas engine with a rated power of 12h power is continuously operated for 12h under the rated working conditions, and the stability of the main performance parameters of the natural gas engine is measured (measured every 1h). The natural gas engine with a rated power of continuous power is continuously operated for 24h under the rated working conditions
6.9 Cylinder working uniformity test
Determine the working uniformity of each cylinder of the natural gas engine when it is running under the rated working conditions, and determine the exhaust temperature unevenness rate. The test method is carried out in accordance with the provisions of (H/1105.2. 6.10 Load characteristic test
Determine the relationship between the heat consumption rate of the natural gas engine and the speed when the natural gas engine is idling. During the test, the natural gas engine is not loaded, and the speed is reduced from the highest no-load speed to the lowest no-load stable speed. The relevant data of each stable speed are measured respectively, and the no-load characteristic curve is drawn. 6.11 Minimum no-load stable speed measurement
The natural gas engine is tested for the minimum no-load stable speed with a dynamometer. During the test, the speed control handle position is gradually adjusted. Reduce the speed, measure the minimum speed and speed fluctuation value of the stable operation of the natural gas engine, and at this speed Stable operation for no less than 5 minutes6.12 Determination of minimum stable working speed
During the test, the fuel supply control mechanism of the natural gas engine is kept at the maximum power position adjusted at the factory, and the load is gradually changed to reduce the speed to the minimum stable working speed, and it can operate stably at this speed. 6.13 Determination of mechanical efficiency
The test method shall be carried out in accordance with the provisions of GB/T1105,2. 6.14 Thermal balance test
During the test, the natural gas engine is operated under the calibrated working conditions. In addition to measuring the main performance indicators, all parameters related to thermal balance should also be measured.
6.15 Noise measurement2. Calculate the stable speed regulation rate by the method specified in GB/T1105.2.
6.6.2 Instantaneous speed regulation rate
The natural gas engine operates stably under the calibrated working conditions, then suddenly unloads all loads or operates stably at the highest no-load speed, then suddenly adds part of the load, and measures the relationship between the speed and time, and then calculates the instantaneous speed regulation rate according to the provisions of GB/T1105.2. 6.6.3 Speed fluctuation rate
The natural gas engine operates under the calibrated conditions and operates stably for 2 minutes. After measuring the maximum speed or minimum speed during this time, calculate the speed fluctuation rate according to the method specified in GB/T1105.2. 6.7 Universal characteristic test
Measure the relationship between the main performance parameters of the natural gas engine when it operates under various conditions, determine the comprehensive economy of the natural gas engine under various working conditions and draw the universal characteristic curve.
Test method is in accordance with the provisions of GB/T1105.2
6.8 Rated power working stability test
Determine the stability of various performance parameters of the natural gas engine when it is running under the rated working conditions. During the test, the natural gas engine with a rated power of 12h power is continuously operated for 12h under the rated working conditions, and the stability of the main performance parameters of the natural gas engine is measured (measured every 1h). The natural gas engine with a rated power of continuous power is continuously operated for 24h under the rated working conditions
6.9 Cylinder working uniformity test
Determine the working uniformity of each cylinder of the natural gas engine when it is running under the rated working conditions, and determine the exhaust temperature unevenness rate. The test method is carried out in accordance with the provisions of (H/1105.2. 6.10 Load characteristic test
Determine the relationship between the heat consumption rate of the natural gas engine and the speed when the natural gas engine is idling. During the test, the natural gas engine is not loaded, and the speed is reduced from the highest no-load speed to the lowest no-load stable speed. The relevant data of each stable speed are measured respectively, and the no-load characteristic curve is drawn. 6.11 Minimum no-load stable speed measurement
The natural gas engine is tested for the minimum no-load stable speed with a dynamometer. During the test, the speed control handle position is gradually adjusted. Reduce the speed, measure the minimum speed and speed fluctuation value of the stable operation of the natural gas engine, and at this speed Stable operation for no less than 5 minutes6.12 Determination of minimum stable working speed
During the test, the fuel supply control mechanism of the natural gas engine is kept at the maximum power position adjusted at the factory, and the load is gradually changed to reduce the speed to the minimum stable working speed, and it can operate stably at this speed. 6.13 Determination of mechanical efficiency
The test method shall be carried out in accordance with the provisions of GB/T1105,2. 6.14 Thermal balance test
During the test, the natural gas engine is operated under the calibrated working conditions. In addition to measuring the main performance indicators, all parameters related to thermal balance should also be measured.
6.15 Noise measurement
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