CN101666759B - Method for quick detecting gasoline cleanliness - Google Patents

Abstract

The invention discloses a method and a device for quick detecting gasoline cleanliness, which comprises the following steps: transporting various types of gasoline to a nozzle through a metering pump so as to mix with air; then spraying to a sediment collector which is heated to an experiment temperature; simulating the generation of a sediment of a gasoline engine air intake valve; carrying out qualitative analysis and quantitative analysis on pictures and colors of the sediment on the collector by a computer image identification system so as to identify the cleanliness of the gasoline. The invention can better simulate an M111 bench test method and has good consistency with an L-2 gasoline engine air intake valve sediment simulation test machine. The invention has the advantages of test cost saving, quick and visual test process, simple and convenient operation, and accurate detection result without being measured by a balance, and is particularly suitable for vibrating places of vehicle-mounted moving detection. The invention can not only test the cleanliness of gasoline detergent, but also test the cleanliness of the gasoline, which is suitable for the environmental protection department and the technical supervision department to carry out an on-site test on the cleanliness of the sold gasoline in the oil depot and gasoline station.

Description

The gasoline cleanliness method for quick

Technical field

The invention belongs to the Motor Vehicle Pollution Prevention technical field, particularly a kind of gasoline cleanliness method for quick.

Background technology

Increase along with each urban automobile quantity of China is anxious, country is to energy-saving and emission-reduction work pay attention to day by day, and is also more and more higher to the requirement of motor vehicle exhaust emission, reaches under Europe IV, the Euro V emissions situation in the motor vehicle manufacturing technology, as the gasoline of one of fuel for motor vehicle, its clean-up performance is just particularly important.Domestic present situation is to reach the state IV standards except that Beijing, Shanghai, area, Pearl River Delta require marketable gasolines at present, and other cities and regional major part are also at country of sale II normal benzine.High more its peace and quiet degree of the standard of automobile is high more, and the sediment that engine intake valve and firing chamber produce is few more, and engine just can keep operate as normal, and the pollutant of motor vehicle exhaust emission is just few more.

In American-European developed country, gasoline standard has reached the above standard of Europe V, but in order further to improve the peace and quiet degree of gasoline, statutory regulation also need add detersive in motor petrol, the vehicle exhaust blowdown is controlled in the littler scope.Several years ago China adds gasoline cleaning agent in the tentative marketable gasolines in some big and medium-sized cities, some positive effects have been obtained, also expedited the emergence of the enterprise of a lot of production detersives thus, because market disappearance field monitoring detersive quality and gasoline cleaning degree methods and equipment, cause society to go up a lot of people and query whether added detersive in the gasoline, and whether the detersive that adds is effective.

At present, gasoline detects in China and the gasoline cleaning degree methods has two kinds, a kind of is the bench test of benz M111 standard, be mainly used in the detergency that detects gasoline cleaning agent, judge by the sediment quality of weighing engine intake valve and firing chamber whether the detersive sample can be by bench test.Bench test equipment is expensive and time-consuming, and the cost height needs special platform experiment chamber and technical professional to operate.Can only detect as the access of detersive, and can not do the conventional sense of gasoline and detersive.Another kind is L-2 gasoline engine gas admittance valve sediment simulation test machine (a GB19592-2004 appendix B appointed product), and this simulation test machine can be operated in the laboratory, save time, expense is low, simple to operate, with the M111 bench test good correlativity is arranged.It weighs the peace and quiet degree of gasoline and detersive by the sediment quality on the weighing gatherer.Can be used as the conventional sense of gasoline cleanliness and as the measuring means of detersive research and development, product quality.But this method is subjected to the restriction that test findings needs the weighing of ten thousand/balance, and test needs 2 hours at every turn, and each test can only be made a sample, can't be used on the vehicle-mounted fast detecting equipment.

Summary of the invention

The purpose of this invention is to provide a kind of gasoline cleanliness method for quick, with solve the detection time that traditional method and apparatus exists long, complicated operation and inconvenience, detect the cost height, be not easy to realize vehicle-mounted, be not easy to the technical matters that field monitoring gasoline cleanliness and each test can only be made a sample.

For achieving the above object, the technical scheme taked of the present invention is:

A kind of hyperchannel gasoline cleanliness method for quick may further comprise the steps:

1. the sediment trap of single or multiple cleanings vertically is placed on the dead ahead of corresponding nozzle respectively;

2. single or multiple sediment traps are heated to simultaneously 180 ℃～190 ℃ working temperature;

3. gasoline is ejected on the workplace of each sediment trap with the speed of 3～5mL/min, forms the oil film similar to the nozzle ejection shape;

4. stop oil spout after 7～13 minutes, after gatherer is warming up to 215 ℃～220 ℃, carry out 5～10 minutes high-temperature baking, the oil film on the sediment trap workplace is under the baking of high temperature, and oxidation generates paint film; (shade of paint film is directly proportional with the content of alkene in the gasoline, and promptly state IV steam oil ratio (SOR) state II content of olefin in gasoline is few, and paint film color is much also shallow);

5. sediment trap being put into petrolic solvent soaked 50～90 seconds, (these oil films are after having added effective detersive in the gasoline to dissolve some oil films that do not form paint film, be diffusion type and be suspended on the gatherer workplace, though, do not generate paint film) through high-temperature oxydation;

6. the sediment trap scanner scanning figure after will soaking, and, judge the peace and quiet degree of gasoline sample automatically via the computer picture recognition system scoring that the test contrast scans figure of importing in advance constitutes, and whether qualified.

Above-mentioned petrolic solvent is a normal heptane.

Above-mentioned hyperchannel gasoline cleanliness method for quick provided by the invention and equipment thereof are in analog gasoline engine intake valve working condition and generate on the basis of sedimental mechanism and obtain.The gasoline sample scoring that detects with this method has good correlativity with petrol engine M111 bench test method (GB/T 19320.5) gas admittance valve sediment weight, and good correlativity is also arranged with the L-2 simulation test machine, and detection time is short, can carry out the detection of three samples simultaneously, each sample only needs 60mL gasoline, has only 1/4th of L-2 gasoline engine gas admittance valve sediment simulation test machine detection time; Testing expenses are low, and equipment investment is little, and are easy and simple to handle; Owing to adopted the computer picture recognition system that gatherer is marked, this equipment configuration be achieved to the mobile monitoring car.Testing result has good differentiation and repeatability.For the monitoring of marketable gasolines detergency quality provides a kind of practicable on-the-spot real-time watch device and method.

Description of drawings

Fig. 1 forms synoptic diagram for the structure of gasoline cleanliness fast detecting equipment of the present invention;

Fig. 2 is the correlationship figure of gasoline cleanliness fast detecting scoring of the present invention with L-2 gasoline engine gas admittance valve sediment simulation test machine sediment weight.

Among the figure: the 1-sediment trap; The 2-well heater; The 3-clamp system; The 4-nozzle; The 5-oil pipe; The 6-gasoline container; The 7-volume pump; The 8-tracheae; The 9-spinner-type flowmeter; The 10-reduction valve; The 11-source of the gas; The 12-axial flow blower; The 13-automatic control system; 14-detects cover; 15-gatherer temperature control subsystem; 16-well heater overtemperature prote control subsystem; 17-programmed control subsystem; The 18-support.

Embodiment

Equipment of the present invention is formed as shown in Figure 1; in the embodiment of hyperchannel gasoline cleanliness fast detecting equipment provided by the invention; its sediment trap 1 back side and well heater 2 are front and back position and are placed on the support 18; clamp system 3 holds out against well heater 2 on sediment trap 1; sediment trap 1, well heater 2 link to each other with self-actuated controller 13, and gatherer temperature control subsystem 15, well heater overtemperature prote control subsystem 16 and programmed control subsystem 17 are arranged in the self-actuated controller 13.The both sides end face of sediment trap 1 is trapezoidal.That well heater 2 can adopt is plate, L type, Δ type, semi-circular or ladder type.Clamp system 3 utilizes the tension force of spring to hold out against well heater 2 and sediment trap 1, also can use screw-clamped.Nozzle 4 has two inlets, an inlet input gasoline, and process is that the gasoline in the gasoline container 6 enters nozzle 4 by oil pipe 5 after volume pump 7 extracts; Another inlet input pressurized air, process is the pressurized air that comes out from source of the gas 11, reduces pressure through reduction valve 10, after passing sub-flowmeter metering, enters nozzle 4 by tracheae 8 again.Pressurized air and gasoline mix in nozzle 4, are the atomizing shape and are sprayed onto continuously on the heated sediment trap 1.Volume pump 7 has guaranteed the steady, accurate of flow, and volume pump 7 can be syringe pump, peristaltic pump, constant-flux pump or infusion pump.Above-mentioned sediment trap 1, well heater 2, step up mechanism 3 and be contained in one and detect in the cover 14, detect the air admission hole that cover 14 positive fronts have three Φ 35～Φ 45mm.Nozzle 4 is contained in the middle of the air admission hole, and nozzle 4 is relative with sediment trap 1 workplace center, detects the back of cover 14 axial flow blower 12 has been installed, and gets rid of and detects unnecessary gas-oil mixture in the cover.Because China refuelling station gasoline kind is generally three, such as, 90 ^#, 93 ^#, 98 ^#So three passages are selected in the invention that this case is implemented.

Utilize the said equipment to carry out the gasoline cleanliness fast detecting below, its step comprises:

1. earlier with sherwood oil cotton balls wiping sediment trap, with the polishing felt polishing, do not have dirt up to any surface finish again, be put in the baking oven after the water flushing and dry, taking-up is placed in the special box standby;

2. three sediment traps are put into successively and detected on the cover medium-height trestle, clamp, be warmed up to 180～190 ℃ test temperature with well heater;

3. the 0.12Mpa that pressurized air reduced pressure, three tunnel air mass flows are controlled at 700L/h by spinner-type flowmeter respectively, give three nozzle air feed;

4. volume pump is at the uniform velocity given three nozzle fuel feeding with 4ml/min speed, sprays to the sediment trap that arrives test temperature after oil gas mixes in nozzle;

5. equipment is under the control of automatic control system, and order finished intensifications-constant temperature-jet-oil spout 10 minutes-stop 215～220 ℃ of programs of toasting 5 minutes-auto stop of oil spout-high temperature; Oil film on the sediment trap workplace is under the baking of high temperature, and oxidation generates paint film.(shade of paint film is directly proportional with the content of alkene in the gasoline, and promptly state IV steam oil ratio (SOR) state II content of olefin in gasoline is few, and paint film color is much also shallow);

6. sediment trap is put into normal heptane solvent and soaked about 1 minute, will be suspended in collector surface can dissolved substances dissolve; (these oil films are after having added effective detersive in the gasoline, are diffusion type and are suspended on the gatherer workplace, though through high-temperature oxydation, do not generate paint film)

7. the sediment trap after will soaking is used the scanner scanning figure simultaneously, and the machine image identification system carries out qualitative and quantitative analysis to figure and color as calculated, chooses score value (0～100 minute).Score value is big more, and detergency is good more, and gasoline is peace and quiet more.

Precision (repeatability)

Same operator uses same equipment at same environment, and the difference of two results of replication and its arithmetic mean sees the following form:

Sediment score value 0～100 minute	Allow difference
		＞50	5 minutes
≤50	10 minutes

Correlativity

72 oil samples of refuelling station detect in the range of Beijing to being collected in to use hyperchannel gasoline cleanliness method for quick and equipment, and done the correlativity investigation with the test findings of L-2 gasoline engine gas admittance valve sediment simulation test machine, both correlationships the results are shown in Figure 2:

As shown in Figure 2, the score value that obtains with this method and equipment and the sediment weight of L-2 gasoline engine gas admittance valve sediment simulation test machine have good correlativity, and related coefficient reaches 0.96.

Claims (2)

1. gasoline cleanliness method for quick may further comprise the steps:

1. the sediment trap of single or multiple cleanings vertically is placed on the dead ahead of corresponding nozzle respectively;

2. single or multiple sediment traps are heated to simultaneously 180 ℃～190 ℃ working temperature;

3. gasoline is ejected on the workplace of each sediment trap with the speed of 3～5mL/min, forms the oil film similar to the nozzle ejection shape;

4. stop oil spout after 7～13 minutes, after gatherer is warming up to 215 ℃～220 ℃, carry out 5～10 minutes high-temperature baking, the oil film on the sediment trap workplace is under the baking of high temperature, and oxidation generates paint film;

5. sediment trap is put into petrolic solvent and soaked 50～90 seconds, dissolve some oil films that do not form paint film;

6. the sediment trap scanner scanning figure after will soaking, and, judge the peace and quiet degree of gasoline sample automatically via the computer picture recognition system scoring that the test contrast scans figure of importing in advance constitutes, and whether qualified.

2. a kind of gasoline cleanliness method for quick as claimed in claim 1 is characterized in that: petrolic solvent is a normal heptane.

Images