what is of lpg?-ag捕鱼平台

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what is of lpg?
source:nanjing environmental protection agency author: date:6,10,2012

liquefied petroleum gas (lpg) is often mistaken propane. in fact lpg is a mixture of oil and natural gas formation under the appropriate pressure and room temperature liquid exists. in the united states and canada, a mixture of two substances usually think it is mainly composed by propane, and in many european countries the lpg propane content of 50% or less
the main source of commercial lpg gas and oil processing and refining raw materials usually contains excess propane and butane part. to prevent these two substances in the high-pressure exhaust pipe condensation, so we must separate them to remove. in the oil refining process. lpg is a mixture of the proportion of light from the crude oil dissolved by titration to collect. but also by fission than the major hydrocarbon molecules. therefore, lpg is considered to be ancillary products. its exact composition and characteristics usually vary according to different sources.
lpg unit of weight than gasoline, can provide weight to 8% higher. (lhv = 19,757 btu / lbm of the) in theory, with lpg vehicles than petrol-driven vehicles have a higher efficiency. this car can get lower fuel consumption while increasing running mileage. however, this is only for the engine specifically for the design and modification of lpg. if you change to a gasoline engine to lpg-driven, it will not get this increase in efficiency. lpg lower than the density of gasoline, the relative demand for oxygen is high, replace more low-density fuel into the air. air into the cylinder body will be less, which makes the efficiency of the unit volume. compared to the momentum generated by the original gasoline engine. power will be reduced.
lpg emissions what is it?
lpg emissions of harmful gases like other internal combustion engine emissions gas mainly consists of the following ingredients:
carbon monoxide
hydrocarbons
nitrogen oxides
with diesel, in fact, particulate matter from the lpg engine does not exclude.
production and emission of carbon monoxide (co) is to fuel is not fully caused by burning. co is an odorless, colorless gas. lpg contains a considerable amount of co when the engine in an enclosed environment, such as: warehouse, building or tunnel under construction, carbon monoxide will be a rapid increase. its concentration has been a threat to human health, people feel headache, dizziness, asphyxia, or death. in general, indoor use of lpg engine, co, has become the center of attention problems.
hydrocarbons (hc) is also to fuel is not fully caused by combustion. lpg emission contains a certain amount of hydrocarbons to the fuel composition. although it is not toxic components like the gasoline engine emissions of hc, harmful to the environment is relatively smaller. hydrocarbons or produce a certain taste of nausea in the staff of the indoor operation of lpg.
nitrogen oxides (nox), oxygen and nitrogen in the engine cylinder under high pressure and high temperature effect. large part of the nox is formed by no and no2, no2 is a reactive gas, to produce great harm to human health. storage of goods, the aggregation of nox will have adverse effects, such as: a small amount of nox can make white paper yellowing. because of its ozone-reduction reaction and smoke will have a significant impact on the environment.
lpg engine is how to clean?
lpg as a clean fuel market. on the road for so many years, would it really clean? lpg does have the potential to become a clean fuel. its excellent emissions performance is an important reason, as follows:
compared to gasoline, co emissions will be reduced (not diesel low).
no heavy hydrocarbon emissions.
low emission of toxic substances such as benzene, butadiene.
low cold from the emissions.
to maintain a good state of emissions, is more stable than gasoline. lpg harmful gases will not be because of the restructuring and the aging of the engine increases.
by the seal to the fuel system, there is no evaporation and leakage problems.
to a variety of reasons, lpg has not as a future fuel alternatives. its role has been replaced by natural gas with diesel and synthetic diesel competition. the result is a more sophisticated lpg engine could not be developed. in the past decade, the gasoline engine and its emissions have made considerable improvements. so the past is considered to be a lot of the advantages of lpg fuel, especially its low co emissions, it is nobody cares about the
in fact, all lpg engines are gasoline conversion. engineering design and did not account for potential low emissions of lpg advantage. engine and fuel control system is not optimized for this new fuel, but also with the original expression, high fuel consumption, emissions of harmful gases attributes. expression and emission properties are usually different for different combinations of engine and conversion. electronic lpg conversion devices should provide the lowest emission and most efficient combustion performance. but so far, not enough data to substantiate its claim. solely mechanical transformation engines manufactured is still far failed to meet the lpg should be the ideal, low-emission properties. the sensible approach is when you purchase indoor with lpg vehicles to the retailers ask for the emissions data. unfortunately, the conversion of lpg new car co emission level of 2-4% are not uncommon. as the principle standard, acceptable lpg engine in a stable state, the concentration of co emissions should be less than 1%.
lpg emissions depend on the engine operating state, from figure 4. the induction of air and oil mixture ratio, the emissions of the lpg can be seen, straight up to fuel large for air mixing ratio at the level of carbon monoxide. should attach great importance to the adjustment and maintenance of the engine run correctly done for low-emission state, but must not only rely on it to adjust and maintain.