Diesel Engine Vs Petrol Engine

For Diesel Engine vs Petrol Engine discussion we have written diesel engines advantages over petrol engines. So Following are is a brief comparison of petrol engine and diesel engine

Diesel Engine Vs Petrol Engine 

A diesel engine burns fuel at a high compression ratio instead of using spark plugs and they are also un-throttled which is why diesel engines are more efficient compared to petrol engines.

Comparing Diesel Engine Vs Petrol Engine over thermal efficiency. The thermal efficiency of diesel engines is higher than that of petrol engines which means that they can convert more of the heat supplied into useful mechanical work and waste less of it in the environment.

Diesel engines are low-carbon and other greenhouse gas emitters. Greenhouse gases are responsible for elevating the earth’s temperature. 

Diesel engines work at lower RPMs contrasted with a petrol engine which causes less frictional losses. The pieces of the diesel engine are thicker because of the high pressing factor they need to withstand. 

This makes them more strong along these lines and less inclined to fall flat. Diesel being a light oil likewise greases up the burning chamber each time it's utilized. This additionally makes it last more as less grinding means less wear which thus implies less maintenance is required. 

These engines are worked for more force while being more effective than a petrol engine. The explanation is the pressure proportion. 

As diesel engines are self-touching off, they need to produce sufficient pressing factors in the burning chamber which would make the diesel light. 

This increment in pressure proportion implies more force/torque delivered when ignition happens. The diesel engine likewise has quicker ignition which implies more force/torque too. 

As they produce more force/torque, diesel vehicles are more qualified for pulling substantial things. 

Force decides the rotational power of the vehicle and the more force/torque a vehicle has the more burden it can convey without losing execution. This makes the diesel-controlled vehicle ideal for weighty takes. 

From fewer visits to the service station to more grounded engine parts that don't flop as regularly, diesel engines are more solid than petrol over the long haul. 

They are costlier to fix than petrol however they flop less regularly when contrasted with petrol along these lines making the chances for diesel.

Emissions from Diesel Engines and Effect on Environment and Human Health

Transport has played an important role in escalating climate change and increasing environmental pollution. 

According to a report by the International Energy Agency in 2012, transport contributes to 22% of carbon emissions which is the second largest in the world. 

Transport is the main source of urban pollution especially in the developing world due to the very limited use of carbon control technology. 

Diesel is chemically made up of carbon and hydrogen in different proportions. 

In a diesel engine, fuel is sprayed onto highly compressed air inside the cylinder which ignites the combustion. High pressure inside the cylinder triggers the auto combustion of diesel. 

If we see from an ideal thermodynamic equilibrium perspective, the combustion process should produce CO2 and H2O. But, due to many reasons such as combustion temperature and timing, air–fuel ratio and turbulence, etc., different harmful products are produced during combustion. 

Carbon monoxide (CO) is emitted due to incomplete combustion when the oxidation process does not occur completely. It is largely dependent on the air-fuel mixture. When the air-fuel mixture is rich and the air is deficient, all the carbon can’t burn which causes CO emission. It is a colorless and odorless gas. 

When we inhale air, it is transported to the lungs and subsequently transmitted to the bloodstream. It binds with hemoglobin and hinders its capacity to transfer oxygen. Depending upon the concentration of CO inhaled, it can damage different organs and can also cause confusion and slow reflexes. 

Brief Introduction of Emission Reduction Techniques for Diesel Engines

Due to adverse effects on both humans and the environment, scientists have adopted different methods to reduce emissions. Most of the researchers have worked on to reduced NOx emissions and it has the highest percentage among other pollutants. 

Lean NOx trap (LNT), Exhaust gas recirculation (EGR), and Selective Catalytic Reduction (SCR) are the most focused technologies by researchers. In EGR, exhaust gas is recirculated in the combustion chamber with fresh air. 

LNT technology works by storing NOx under lean mixture conditions and using it when the mixture is rich. SCR is an advanced technology that uses a liquid agent in the exhaust stream of a diesel engine. The 

Separate systems for emission control i.e. Diesel oxidation catalyst (DOC), Diesel particulate filter (DPF), and Selective catalytic reduction (SCR), are also extensively used.

That all for Diesel Engine Vs Petrol Engine Have a great day