An exhaust system was initially used to securely pass exhaust gasses from the engine to the atmosphere while attenuating combustion noise. However, exhaust gas includes components that affect the health and the environment of humans. As a result, emission levels of these components of the exhaust gas have been monitored. As controlled emission levels are often considerably lower than those achieved by in-cylinder control steps, after leaving the engine, the exhaust gas must be handled. Although emission control systems still perform their original functions, they have grown into one of the essential components of controlling and reducing emissions in modern engines. EXHAUST MANIFOLD BOLT ket is one of the most significant parts of this diesel exhaust site.
Catalytic converters and diesel particulate filters (PDF) are available for use in light-duty applications, either close-coupling to the exhaust collector (converter in Figure 1) or underfloor site (the particulate filter in Figure 1). The choice of location depends on the room’s disponibility and the ideal temperature profile. The close-knit position gives optimum visibility of exhaust gas temperatures.
The exhaust system usually consists of the following components:
- Catalytic converters
- particulate filters (catalytic converters), to minimize pollutant emissions
- Mufflers that attenuate the noise,
- Elements that link the exhaust collector with the remainder of the exhaust system.
Hangers and piping.
Often the after-treatment equipment and its piping are called the “hot end” of the exhaust system, while the mufflers and tailpipes are the “cold ending.” Hot end piping may include a “down” or “front pipe,” which connects the exhaust collector with the catalytic converter, as well as a pipe from which the catalyst and particulate filter will be mounted in the configuration shown in Figure 1. The after-treatment device is connected by the center pipe with the muffler. The choice of exhaust system materials is determined by exposure and other considerations such as strength and chemical exposure.
Brakes of exhaust
A variety of specialized components can also be used in exhaust systems. Some diesel trucks have the exhaust brake to reduce the demand on wheeled brakes and improve durability, using the exhaust gas pressure to brake the vehicle. When the motor produces no output and braking is needed, the exhaust backpressure and the torque necessary to rotate the engine are increased by switching on a throttle valve in the exhaust system. The turbine vanes can be used for throttling the exhaust flow instead of an independent throttle valve when the engines are fitted with a variable geometry turbine (VGT). A feature that keeps the exhaust valve open (the ‘bladder brake’) always increases the brakes’ effectiveness. This can be achieved by pushing the exhaust valve and keeping it open during the four-engine strokes. It is also possible to do this.
A range of medium-scale diesel engines can be fitted with exhaust braking, including heavy trucks to pull heavy trailers. Their application and efficiency are limited by the maximum pressure, which components of the exhaust system upstream can withstand. Elimination brakes have no impact on the noise of the exhaust system.
Exhaust brakes are only one way to help decelerate the engine. Compression breakouts—sometimes called motor frequencies–open the fatigue valve at the top of the compression stroke and release the compressed air into the exhaust system to force the piston down during the expansion stroke. Compression release breaks, such as those in class 8, are also integrated directly into heavy-duty diesel engines. The braking effect is substantially more significant than the exhaust braking without rising backpressure of the exhaust system—waste Heat Recovery. Future exhaust systems may also include exhaust gas energy recovery systems. In the diesel engine, the exhaust gas enthalpy represents a significant fraction of the fuel’s chemical energy—up to over 30%—which is one of the most significant sources of thermal efficiency loss.
We hope this article has helped you much in knowing about the exhaust systems of the diesel generators.