CN108088683B - Diesel engine nozzle blockage simulation test method and equipment - Google Patents
Diesel engine nozzle blockage simulation test method and equipment Download PDFInfo
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- CN108088683B CN108088683B CN201810066853.3A CN201810066853A CN108088683B CN 108088683 B CN108088683 B CN 108088683B CN 201810066853 A CN201810066853 A CN 201810066853A CN 108088683 B CN108088683 B CN 108088683B
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- 238000004088 simulation Methods 0.000 title claims abstract description 20
- 238000010998 test method Methods 0.000 title claims abstract description 14
- 239000002184 metal Substances 0.000 claims abstract description 118
- 238000012360 testing method Methods 0.000 claims abstract description 61
- 239000002283 diesel fuel Substances 0.000 claims abstract description 54
- 238000005086 pumping Methods 0.000 claims abstract description 18
- 239000011261 inert gas Substances 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 21
- 238000005259 measurement Methods 0.000 claims description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 8
- HECLRDQVFMWTQS-RGOKHQFPSA-N 1755-01-7 Chemical compound C1[C@H]2[C@@H]3CC=C[C@@H]3[C@@H]1C=C2 HECLRDQVFMWTQS-RGOKHQFPSA-N 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 239000013049 sediment Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 2
- 238000012546 transfer Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 16
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 15
- 239000003599 detergent Substances 0.000 description 9
- 239000007788 liquid Substances 0.000 description 6
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 3
- 239000012459 cleaning agent Substances 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- HSNWZBCBUUSSQD-UHFFFAOYSA-N amyl nitrate Chemical compound CCCCCO[N+]([O-])=O HSNWZBCBUUSSQD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/042—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12
Abstract
The invention relates to a diesel engine nozzle blockage simulation test method and equipment, wherein the method comprises the following steps: (1) passing a metal capillary through a metal bath; (2) Setting the temperature of the metal bath to 40-60 ℃, keeping constant temperature, pumping air to the metal capillary tube at constant pumping pressure, and measuring the flow value before test; (3) heating the metal bath to the test temperature and maintaining the constant temperature; (4) Intermittently injecting a trace amount of diesel oil into the metal capillary tube at a certain frequency under the pushing of inert gas; (5) After the test is finished, cooling the metal bath to the same temperature as that in the step (2), pumping air to the metal capillary tube at the same pumping pressure as that in the step (2), and measuring the flow value after the test; (6) Subtracting the flow value after the test from the flow value before the test, and dividing the obtained difference by the flow value before the test to obtain the blockage rate of the diesel oil in the metal capillary. The apparatus is for implementing the method. The test method and the test equipment of the invention are similar to the working principle of the nozzle of the diesel engine, and are suitable for diesel with the grade above national standard V.
Description
Technical Field
The invention belongs to the technical field of petrochemical product performance detection, and particularly relates to a diesel oil detergency simulation detection method and equipment.
Background
With the increase of the number of motor vehicles in China, haze caused by the exhaust emission of the motor vehicles is attracting attention more and more, particularly, diesel vehicles are easy to generate carbon deposit in a nozzle under the condition of poor maintenance, so that the nozzle of an engine is blocked, and diesel oil is bad to atomize, the oil consumption is increased, the power is reduced, the emission of particulate matters is increased and black smoke is emitted. In order to solve the problem, a method for adding diesel oil detergent into diesel oil is generally adopted at home and abroad, so that the nozzle generates little or no carbon deposit, and the pollution of diesel oil automobiles to the environment is reduced. The existing method for evaluating the diesel oil cleaning agent is as follows: the cleaning effect of the diesel oil cleaning agent is evaluated by adopting European engine pedestal test equipment and a method (XUD-9 engine pedestal) by testing the cleanliness of a diesel oil nozzle, only 3 scientific research units belonging to China petroleum, china petrochemical industry and environmental protection department in China have the pedestal, and the pedestal test equipment needs a special factory building, a lot of auxiliary equipment and professional technicians to operate and control due to long detection time and high test cost of the engine pedestal, and cannot be popularized and used and can only be used for admittance detection of the diesel oil cleaning agent product entering the market. From the current situation, government regulatory authorities and product manufacturers need a quick and simple evaluation method of diesel detergents, and an ideal method is to be able to detect the detergency of commercial diesel and directly control the diesel detergency index of a gas station.
Prior to the present invention, zhang Demin, li Rong, zhang Jia invented a "method for testing diesel detergency and apparatus therefor" in 2005, the patent number of this invention was ZL200510096122.6, and the apparatus was also put into mass production, which has been used by some diesel detergent research and development and production departments to test the detergency of diesel detergents. However, after the diesel oil standards of China III and IV are implemented in the 2013 country, the phenomenon that diesel oil sediment is not reduced and increased after the detergent is added is detected by using the method and the equipment, which is opposite to the result of the XUD-9 engine bench test. The probability of this phenomenon is higher for national V diesel. For this reason, before 2013, domestic automotive diesel fuel is subjected to national standard II, the cetane index is 45, the national standard III is started to be carried out after 7 months and 1 day of the year, the cetane index is improved to 49, and the index is greatly improved, so that the cetane number of the diesel fuel is not met by the process and diesel fuel components of part of refineries, and therefore, the cetane number improver is started to be added to the diesel fuel, the national standard V diesel fuel is carried out in 2015, the cetane number is improved to 51, and basically the cetane number improver is added to the automotive diesel fuel produced by each refinery. The original working principle of the invention is that the 'sloping plate' forms coke, the test diesel oil flows downwards along the heated sloping plate in the test process, and is completely exposed in the air, the cetane number improver belongs to a strong oxidant, and multiple sediments can be generated after the cetane number improver contacts with the air and a hot plate, and the phenomenon can be verified by the following tests: diesel fuel of 2013 ii was selected and tested on the apparatus of the present invention, and the coking rate (%) of diesel fuel deposit with and without cetane improver (amyl nitrate) was compared with that of the diesel fuel deposit of the present invention as shown in table 1 below.
Table 1 test results using ZL200510096122.6 method and apparatus
As can be seen from Table 1, after the addition of 2% cetane improver, the blank diesel deposit increased 3.8 times and the diesel deposit containing the detergent increased 6.6 times, so that the phenomenon that the diesel deposit containing the detergent was not reduced in reflection and increased was caused. The above experiments demonstrate that the method and apparatus of the present invention have not been suitable for evaluating diesel fuel containing cetane improvers. Therefore, new simulation methods and equipment are needed to be developed to adapt to diesel oil containing cetane number improvers, and the detergency simulation evaluation work of diesel oil of grade V above national standard is completed.
Disclosure of Invention
The invention mainly aims to provide a simulation test method which is similar to the working principle of a nozzle of a diesel engine and is suitable for diesel oil with the grade above national standard V.
It is a further object of the invention to provide an apparatus for carrying out the method.
In order to achieve the main purpose, the invention adopts the technical scheme that the invention provides a diesel engine nozzle blockage simulation test method, which comprises the following steps:
(1) Preparing a metal capillary and a metal bath, wherein the metal capillary passes through the metal bath;
(2) Setting the temperature of the metal bath to 40-60 ℃, keeping constant temperature, pumping air to the metal capillary tube at constant pumping pressure, and measuring the air flow in the metal capillary tube to obtain a flow value before test;
(3) Heating the metal bath to a test temperature and maintaining the temperature constant;
(4) Intermittently injecting a trace amount of diesel oil into the metal capillary tube at a certain frequency under the pushing of inert gas; generating a deposit under the test temperature of a diesel oil film in the metal capillary;
(5) After the test is finished, cooling the metal bath to the same temperature as that in the step (2), pumping air to the metal capillary tube at the same pumping pressure as that in the step (2), and measuring the air flow in the metal capillary tube to obtain a flow value after the test;
(6) Subtracting the flow value after the test from the flow value before the test, and dividing the obtained difference by the flow value before the test to obtain the blockage rate of the diesel oil in the metal capillary. The blockage rate can be expressed in terms of a percentage.
The further technical scheme is that the front 2/3 section of the metal capillary tube from the inlet to the outlet is an inner hole, and the aperture of the rear 1/3 section is reduced by half to form a choke.
In the step (3), the test temperature is set in a temperature gradient manner; the maximum temperature is set at the choke, with the maximum temperature being 300 ℃ to 330 ℃.
In the further technical scheme, in the step (4), the frequency is once per minute, the injection amount is 0.13-0.2 mL each time, and the total injection time is 1.5-2 h.
In the further technical scheme, in the step (2), the temperature is 50 ℃; the pumping pressure is provided by a pumping pump and is-10 kPa to-15 kPa. The suction pressure is preferably-11 kPa.
In the further technical scheme, in the step (4), dicyclopentadiene is added into diesel oil.
To achieve another object of the present invention, the present invention provides an apparatus for implementing the above-mentioned diesel engine nozzle clogging simulation test method, comprising: a metal bath and a metal capillary, the metal capillary passing through the metal bath; the air flow measurement assembly comprises an air flow meter, an air pump, a first measurement electromagnetic valve and a second measurement electromagnetic valve, wherein the first measurement electromagnetic valve and the second measurement electromagnetic valve are respectively connected to two ends of the metal capillary, the air flow meter is connected with the first measurement electromagnetic valve, and the air pump is connected with the second measurement electromagnetic valve; the diesel oil introducing assembly comprises an inert gas introducing port, a sample containing bottle and a three-way electromagnetic valve, wherein the three-way electromagnetic valve is respectively connected with one end of the metal capillary tube, the inert gas introducing port and the sample containing bottle, and the inert gas introducing port is also connected with the sample containing bottle through a pipeline; the collecting assembly comprises a cooler and an oil-gas separator which are connected with the other end of the metal capillary tube, and an exhaust electromagnetic valve and an air filter which are connected with the oil-gas separator.
The further technical scheme is that the device further comprises: the quick-screwing joint is connected with and seals the two ends of the metal capillary tube; and a control device for controlling the temperature of the metal bath.
The further technical proposal is that the total length of the metal capillary tube is 200mm, the front 2/3 section is an inner hole, and the aperture of the rear 1/3 section is reduced by half to form a choke; the metal capillary is formed by punching, embedding and extruding.
The further technical scheme is that the reading accuracy of the air flowmeter is more than four digits.
The further technical proposal is that the air filter is an activated carbon filter.
The metal bath is formed by connecting a plurality of sub-metal baths in series; gaps are reserved between the sub-metal baths, and the respective independent heaters are arranged, and the temperature is controlled by a control device respectively; the temperature of the plurality of sub-metal baths increases from the inlet to the outlet of the metal capillary in sequence, forming a temperature gradient across the metal capillary.
The cooler is cooled by water cooling, air cooling or heat transfer cooling through a material with rapid heat conduction property.
The further technical proposal is that the inert gas inlet is connected with the nitrogen supply device.
The further technical proposal is that the diesel oil added with dicyclopentadiene is placed in the sample containing bottle.
The invention can obtain the following beneficial effects:
the diesel nozzle blockage simulation test method and the diesel nozzle blockage simulation test equipment provided by the invention have better correlation with XUD-9 bench test. Since diesel oil is carried by inert gas such as nitrogen gas in the whole course of the experimental equipment, does not contact air, does not generate oxidation, and is the same as the working environment in an engine nozzle, the diesel oil can be applied to evaluating the diesel oil detergency containing the cetane number improver, and the experimental repeatability is high. In consideration of the rapidness of the simulation test, dicyclopentadiene can be added into a diesel oil sample of the simulation test as a coking agent, so that the test time is shortened by five times.
The invention uses the metal capillary tube with variable diameter to better simulate the shape of the inner cavity and the nozzle of the engine nozzle, and improves the positive correlation with the test result of the engine bench. The diesel oil is carried by nitrogen in a closed system into this reducing metal capillary tube, which is heated in a metal bath with temperature gradient control. The diesel forms a sediment at the variable diameter of the metal capillary, and the sediment changes the choke diameter of the variable diameter of the capillary, so that the air flow rate of the measured capillary after the test is lost.
Drawings
FIG. 1 is a schematic diagram of a diesel engine nozzle clogging simulation test apparatus.
In the figure: 1-a metal bath; 2-metal capillary; 3-sample holding bottle; 4-a three-way electromagnetic valve; 5-quick-twist fitting; 6-a control device; 7-an inert gas inlet; 8-a first measurement solenoid valve; 9-a second measurement solenoid valve; 10-an air extracting pump; 11-an air flow meter; 12-a waste liquid bottle; 13-an exhaust solenoid valve; 14-an activated carbon filter; 15-a cooler.
Detailed Description
The method and apparatus for simulating clogging of a diesel engine nozzle according to the present invention will be described in detail with reference to the accompanying drawings and detailed description.
As shown in fig. 1, in the embodiment of the diesel engine nozzle blockage simulation test equipment provided by the invention, a metal capillary tube 2 passes through a metal bath 1, two ends of the metal capillary tube 2 are respectively provided with an inlet and an outlet of the metal capillary tube 2, the inlet and the outlet are respectively connected and sealed by a quick-screw joint 5, and the temperature of the metal bath 1 is controlled by a control device 6.
In this embodiment, the total length of the metal capillary 2 is 200mm, the front 2/3 section is an inner hole with a hole diameter of about 1mm, the hole diameter of the rear 1/3 section is reduced by half to form a choke, the hole diameter of the inner hole at the inlet is larger, the hole diameter at the outlet is smaller, and the metal capillary has obvious choke, and the metal capillary can be formed by drilling, embedding and extrusion modes.
The metal bath 1 is formed by serially connecting a plurality of sub-metal baths, gaps are reserved among the sub-metal baths, and the sub-metal baths are provided with independent heaters, and the temperature of the sub-metal baths is controlled by a temperature controller of a control device 6, so that the temperature of the sub-metal baths increases gradually from an inlet to an outlet of the metal capillary 2, and a temperature gradient is formed on the metal capillary 2.
In the present embodiment, the air flow measurement of the metal capillary tube 2 is controlled by a first measuring solenoid valve 8 and a second measuring solenoid valve 9 respectively connected to both ends of the metal capillary tube 2, the first measuring solenoid valve 8 is connected to an air pump 10, and the second measuring solenoid valve 9 is connected to an air flow meter 11.
In this embodiment, the metal bath 1 and all the solenoid valves are connected to a control device 6, and the control device 6 controls the temperature of the metal bath 1 and the on-off state of each solenoid valve.
During the test, diesel oil in the sample bottle 3 is injected into the metal capillary 2 through the three-way electromagnetic valve 4 by nitrogen through the inert gas inlet 7, and nitrogen is pushed out of the metal capillary 2 through the inert gas inlet 7 by nitrogen, and the nitrogen can be replaced by other protective gases as carrier gas.
The diesel oil sample discharged from the high-temperature metal capillary tube 2 is in a high-temperature oil-gas mixture state, and after being cooled by the cooler 15, the liquid part is left in the waste liquid bottle 12, and the gas part is emptied after being purified by the exhaust electromagnetic valve 13 and the activated carbon filter 14. The cooler can be cooled by water cooling, air cooling or natural cooling by a material with rapid heat conduction property.
Before and after the test, the flow of the metal capillary tube 2 is measured, at this time, the exhaust electromagnetic valve 13 and the three-way electromagnetic valve 4 are required to be closed, the first measurement electromagnetic valve 8 and the second measurement electromagnetic valve 9 are opened, the air pump 10 is started, the air pumping pressure is constant, air flows through the metal capillary tube 2 through the air flow meter 11, and the flow value of the metal capillary tube 2 is read through the air flow meter 11. The reading accuracy of the air flow meter 11 needs to be displayed by more than four digits. The pump 10 may be a vacuum pump or other type of pump.
The diesel oil blocking rate test is carried out by using the device of the embodiment, and the specific steps comprise:
1. the power switch of the equipment is turned on, and the metal bath 1 is automatically kept at a constant temperature of 50 ℃.
2. Taking a metal capillary 2, taking one end with a large aperture as an inlet, and taking one end with a small aperture as an outlet, and respectively matching with the inlet and the outlet of the metal bath 1; the two ends of the metal capillary tube 2 are connected and sealed by using a quick-screw joint 5.
3. Adding 1 to a sample containing bottle 3: 2 proportion xylene and n-heptane mixed liquid 30mL, screw up the bottle lid, shake flourishing appearance bottle 3, wash the bottle inner wall, turn on the washing function switch, nitrogen gas will flourish the mixed liquid in appearance bottle 3 and in the waste liquid bottle 12 through pipeline and metal capillary 2, and blow nitrogen gas and make the metal capillary 2 inner chamber dry for 5 minutes.
4. And starting a flow measurement switch, sucking air from a measurement system by the air sucking pump 10, adjusting the suction pressure to-11 kPa, and recording a flow value displayed by the air flowmeter, namely a flow value before the test.
5. 20mL of diesel oil (or diesel oil containing detergent) is measured and poured into a sample containing bottle 3, 1mL of dicyclopentadiene is added, and the bottle cap is screwed on and the bottle cap is uniformly shaken.
6. When the start switch is pressed down, the metal bath 1 starts to heat up until the temperature at the choke of the metal capillary 2 reaches 300-330 ℃, and the metal capillary is kept at a constant temperature. Simultaneously, under the pressure of nitrogen, the diesel oil in the sample containing bottle 3 is injected into the metal capillary 2 at the frequency of 1 time per minute under the control of the three-way electromagnetic valve 4, the injection amount of each injection is 0.13 mL-0.2 mL, and the nitrogen carrier belt passes through the metal capillary 2, so that a diesel oil film in the metal capillary 2 generates sediment under the action of high temperature. Repeating the steps from 1.5h to 2h, ending the control by a timer, and automatically entering a cooling stage by the equipment.
7. And (4) when the temperature is reduced to 50 ℃ and the temperature is constant, repeating the step (4), and measuring the flow value after the test.
8. Calculating the blockage rate: subtracting the flow value after the test from the flow value before the test, dividing the obtained difference value by the flow value before the test, and multiplying the obtained number by 100% to obtain the blockage rate of the metal capillary; the calculation is performed according to the following formula 1:
D％＝(f 1 –f 2 )/f 1 *100% (1)
Wherein: f (f) 1 The flow value before the test is in mL;
f 2 the flow value after the test is in mL;
d is the clogging rate in%.
The smaller the plugging rate is, the better the detergency of the diesel sample is.
The test method meets the requirement of the same operator, and the same equipment is used in the same laboratory to repeatedly measure the precision of the difference between the two results and the arithmetic average value less than or equal to +/-10 percent.
The results of the tests using the diesel fuel samples used in Table 1, using the diesel engine nozzle clogging simulation test apparatus and test method of the present invention, are shown in Table 2.
TABLE 2 test results using the methods and apparatus of the present invention
From the test results in table 2, it is known that: the plugging rate of diesel oil without cetane number improver and diesel oil with 2% cetane number improver is obviously reduced after the detergent is added, and the plugging rate is positively related to the test result of an engine bench. It can be seen that the present invention solves the problems of the prior art.
Finally, it should be emphasized that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention, but rather that various changes and modifications can be made by those skilled in the art without departing from the spirit and principles of the invention, and any modifications, equivalent substitutions, improvements, etc. are intended to be included within the scope of the present invention.
Claims (9)
1. The diesel engine nozzle blockage simulation test method is characterized by comprising the following steps of:
(1) Preparing a metal capillary and a metal bath, the metal capillary passing through the metal bath;
(2) Setting the temperature of the metal bath to 40-60 ℃, keeping constant temperature, pumping air to the metal capillary tube at constant pumping pressure, and measuring the air flow in the metal capillary tube to obtain a flow value before test;
(3) Heating the metal bath to a test temperature and maintaining the temperature constant;
(4) Intermittently injecting a trace amount of diesel oil into the metal capillary tube at a certain frequency under the pushing of inert gas; generating a sediment at a test temperature by a diesel oil film in the metal capillary;
(5) After the test is finished, cooling the metal bath to the same temperature as that in the step (2), pumping air to the metal capillary tube at the same pumping pressure as that in the step (2), and measuring the air flow in the metal capillary tube to obtain a flow value after the test;
(6) Subtracting the flow value after the test from the flow value before the test, and dividing the obtained difference by the flow value before the test to obtain the blockage rate of diesel oil on the metal capillary;
the front 2/3 section of the metal capillary tube from the inlet to the outlet is an inner hole, and the aperture of the rear 1/3 section is reduced by half to form a choke; in the step (3), the test temperature is set in a temperature gradient; the maximum temperature is set at the choke, with the maximum temperature being 300 ℃ to 330 ℃.
2. The diesel engine nozzle blockage simulation test method of claim 1, wherein:
in step (4), the frequency is once per minute, the amount of each injection is 0.13mL to 0.2mL, and the total injection time is 1.5h to 2h.
3. The diesel engine nozzle blockage simulation test method according to claim 1 or 2, wherein:
in step (2), the temperature is 50 ℃; the pumping pressure is provided by a pumping pump, and the pumping pressure is-10 kPa to-15 kPa;
in the step (4), dicyclopentadiene is added to the diesel fuel.
4. An apparatus for carrying out the diesel engine nozzle blockage simulation test method of claim 1, wherein the apparatus comprises:
a metal bath and a metal capillary, the metal capillary passing through the metal bath;
the air flow measurement assembly comprises an air flow meter, an air pump, a first measurement electromagnetic valve and a second measurement electromagnetic valve, wherein the first measurement electromagnetic valve and the second measurement electromagnetic valve are respectively connected to two ends of the metal capillary, the air flow meter is connected with the first measurement electromagnetic valve, and the air pump is connected with the second measurement electromagnetic valve;
the diesel oil inlet assembly comprises an inert gas inlet, a sample containing bottle and a three-way electromagnetic valve, wherein the three-way electromagnetic valve is respectively connected with the metal capillary inlet, the inert gas inlet and the sample containing bottle, and the inert gas inlet is also connected with the sample containing bottle through a pipeline;
the collecting assembly comprises a cooler and an oil-gas separator which are connected with the outlet of the metal capillary tube, and an exhaust electromagnetic valve and an air filter which are connected with the oil-gas separator.
5. The apparatus of claim 4, wherein the apparatus further comprises:
the quick-screwing joint is connected with and seals the two ends of the metal capillary tube;
and a control device which controls the temperature of the metal bath.
6. The apparatus according to claim 4 or 5, characterized in that:
the total length of the metal capillary tube is 200mm, the front 2/3 section is an inner hole, and the aperture of the rear 1/3 section is reduced by half to form a bottleneck; the metal capillary is formed by punching, embedding and extruding;
the reading accuracy of the air flowmeter is more than four digits;
the filter is an activated carbon filter.
7. The apparatus according to claim 4 or 5, characterized in that:
the metal bath is formed by connecting a plurality of sub-metal baths in series; gaps are reserved between the sub-metal baths, and the respective independent heaters are arranged, and the temperature is controlled by a control device respectively; the temperature of the plurality of sub-metal baths increases from the inlet to the outlet of the metal capillary tube in sequence, and a temperature gradient is formed on the metal capillary tube.
8. The apparatus according to claim 4 or 5, characterized in that:
the cooler is cooled by water cooling, air cooling or heat transfer cooling through a material with rapid heat conduction property.
9. The apparatus according to claim 4 or 5, characterized in that:
the inert gas inlet is connected with the nitrogen supply device;
and diesel oil added with dicyclopentadiene is placed in the sample containing bottle.
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| CN201810066853.3A CN108088683B (en) | 2018-01-24 | 2018-01-24 | Diesel engine nozzle blockage simulation test method and equipment |
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| CN201810066853.3A CN108088683B (en) | 2018-01-24 | 2018-01-24 | Diesel engine nozzle blockage simulation test method and equipment |
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| CN108088683B true CN108088683B (en) | 2024-03-08 |
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| CN109540528B (en) * | 2018-11-02 | 2021-04-20 | 中国航空工业集团公司北京航空精密机械研究所 | Be used for online capability test device of engine nozzle |
| CN110848003B (en) * | 2019-11-15 | 2021-06-01 | 中国重汽集团济南动力有限公司 | Air-assisted SCR urea consumption low-fault simulation method |
| CN113369225B (en) * | 2021-06-11 | 2022-11-08 | 华能曲阜热电有限公司 | Online purging system of ammonia injection flowmeter and control method |
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