Vehicle gasoline cleanliness tester

With the development of China's national economy, the progress of the automotive industry, and the improvement of people's lives, the number of cars owned continues to increase, and the impact on the environment is becoming increasingly serious. Therefore, as the emission standards for automobiles gradually increase and control becomes increasingly strict, the requirements for the quality and cleanliness of gasoline have also become higher.

Gasoline with poor cleanliness not only increases the content of deposits in the intake valve system and combustion chamber, but also leads to an increase in harmful substance emissions and pollutes the atmosphere.

Various countries around the world have formulated corresponding mandatory emission reduction standards, and China has also formulated corresponding standards. Beijing and Shenzhen have also formulated corresponding local standards, which explicitly stipulate that effective carbon removal agents should be added to automotive gasoline, and the emission standards must meet the national standardsⅣThe countryⅤ.

2011year2the moon14The Ministry of Environmental Protection of Japan has released the fourth and fifth phases of the "Control Standards for Hazardous Substances in Automotive Gasoline"（GWKB1.1-2011）The standard clearly states that“Automotive gasoline should be mixed with gasoline that meets the requirementsGB19592Required detergent”To improve the cleanliness level of automotive gasoline, protect the environment and human health, and establish standardized methods for assessing the cleanliness of automotive gasoline－－－－-The method for determining oxygen poor glial cells is included in the appendixA.

Currently, there are internationally recognized methods for gasoline cleanliness testing both domestically and internationallyM111Law andFord 2.3LThe law has been implemented as a mandatory standard.

But due toM111Law andFord 2.3LLaw exists:

▲Expensive equipment

▲Complicated operation

▲Long testing cycle

▲High testing costs

▲There are only a few domestically, which can only be used for high-level testing such as arbitration inspection and type certification, and are not suitable for daily supervision, management, and monitoring of gasoline cleanliness in the market.

The existing methods in China are difficult to timely determine whether the gasoline used for commercial vehicles has been added with cleaning agents? How much have you added? How effective is it? As a result, market monitoring has spiraled out of control, leading to inadequate management of automobile emissions and urban air quality.

Therefore, it is urgent to establish a simple, fast, accurate, and economical detection method and equipment for determining the cleanliness of automotive gasoline. In order to: unify methods and equipment as the basis for departments to conduct rapid, timely, and accurate testing in accordance with the law,Ensure the quality of commercially available gasoline, stabilize the emission of harmful substances from automobiles, and improve the environment.

Vehicle gasoline cleanliness tester shouldinstrumentThe method breaks through the limitations of conventional methods and adopts oxygen deficient approach—evaporation—The innovative method of extraction can effectively determine whether detergent has been added to gasoline and the effect of adding detergent.

The instrument mainly consists of the following parts:

◆Heating and evaporation system

◆Temperature controller

◆Gas diversion system

◆Gas flow control system

◆Pressure control system

The auxiliary instruments and equipment mainly include: air compressor, analytical balance, oven, dryer, evaporator cup, etc.

Main technical specifications and operating parameters of the instrument

sample determination

◆Connect the air circuit according to the instrument manual;

◆Clean the evaporating cup as required and maintain a constant weight;

◆Evaporation steps: Add to the evaporation cup50mlPlace the sample in an evaporation bath（173℃,30L/min)，70minAfter removing the constant weight, put it back into the evaporation bath10minRear constant weight;

◆Extraction steps: Add to the evaporating cup that has already evaporated25mlLight hydrocarbons, stand still10minExtraction (dissolution of soluble substances in residue),Be careful to pour out the extraction solution and repeat according to the situation2～3Add liquid extraction until the extract is colorless;

◆Constant weight: Place the extracted evaporation cup into the evaporation bath without a flow hood and let it dry10minAfter removal, the weight remains constant, and the difference between the two weighings is not greater than0.6mg.

◆calculation:

Unwashed residue content of automotive gasolineANot yet（mg/100ml）According to the formula1calculation:

Adid not=2000（M1-M2+M3-M4）……. (1)

Residual content of car gasoline after washingAWash it（mg/100ml）According to the formula2calculation:

Awash=2000（M5-M2+M3-M6）……. (2)

Judgment criteria

■Preliminary characterization:

●If the remaining residue in the evaporation cup after gasoline evaporation can be removed by cleaning with light hydrocarbons regardless of the amount, then the cleanliness of the gasoline used in the vehicle is judged to be qualified.

●If there is a large amount of residue left after gasoline evaporation, but it can be removed by washing with light hydrocarbons, it indicates that the detergent has good cleaning performance. If it cannot be washed away with light hydrocarbons, it is judged that the gasoline cleanliness is not qualified, indicating that the amount of detergent added is insufficient or the quality of the detergent is poor.

conclusion

■Established based on the mechanism of gasoline gum and asphaltene formation“Oxygen deficient glial method”The method for determining the cleanliness of gasoline and enterprise detergents, and the results obtained are consistent withM111The experimental results of the method have good correlation, and its cleanliness is determined based on the following principles:

1The residual mass after extraction of automotive gasoline samples is less than5mg/100ml,Then it is determined that the cleanliness of automotive gasoline is qualified.

2The quality difference of residual substances before and after extraction of automotive gasoline samples is ＜10mg/100 mlThe residual mass after extraction is greater than5mg/100mlIf it is determined that the cleanliness of the gasoline used in the car is not qualified, it is either not added or the amount added is insufficient.

3The mass of residual substances before extraction of automotive gasoline samples is greater than30mg/100mlAnd the residual mass after extraction is greater than5mg/100mlRegardless of the difference in residual substances before and after extraction, the gasoline cleanliness is judged to be unqualified. If a detergent has been added, the quality of the detergent is judged to be poor.

Update time: 2020/9/4 16:49:52