MAN Marine Diesel Heat Exchanger Tube Bundle
MAN Marine Diesel Heat Exchanger Tube Bundle
MAN Heat exchanger
For MAN D2840 D2842
The working principle of the marine diesel engine heat exchanger tube bundle is based on the basic principles of heat conduction and convection heat transfer. When the diesel engine is running, high-temperature cooling water flows through the heat exchanger tube bundle, while low-temperature seawater or other cooling medium flows in the shell bundle. Through the thermal conductivity of the heat exchanger tube wall, the heat is transferred from the high temperature cooling water in the tube course to the low temperature cooling medium in the shell course, thus realizing the cooling water cooling of the diesel engine to ensure the normal operation of the diesel engine.
Structure and composition
Heat exchanger tube: it is the core component of the tube bundle, usually made of corrosion-resistant metal materials, such as copper-nickel alloy, stainless steel and so on. These materials can resist the erosion of seawater, fuel oil and other media to ensure the long-term stable operation of the heat exchanger. The shape of the heat exchanger tube is mostly round, and its diameter, wall thickness and length are determined according to the design requirements of the heat exchanger and the actual working conditions.
Tube plate: Used to fix the ends of the heat exchanger tube, connect the tube bundle with the shell of the heat exchanger, and at the same time play a role in separating the tube and shell fluids. Tube plate is generally made of high-strength metal plate, such as carbon steel, stainless steel, etc., and its thickness needs to be designed according to the pressure level and diameter of the heat exchanger and other factors.
Folding plate or support plate: the role of the folding plate is to guide the shell fluid in accordance with the specified path for many times transversely through the tube bundle, to enhance the degree of turbulence of the fluid to improve heat transfer efficiency, but also play a role in supporting the tube bundle, to prevent the heat exchanger tube vibration and deformation of the fluid scouring. The support plate is mainly used to support the longer heat exchanger tube to prevent it from sagging due to its own weight.
Role and importance
Cooling the diesel engine: effectively take away the heat generated during the operation of the diesel engine, prevent the diesel engine from overheating, ensure that it operates within the normal operating temperature range, prolong the service life of the diesel engine, and improve its working efficiency.
Maintain system stability: Ensure the temperature stability of diesel engine cooling system, lubrication system and other working systems, and then maintain the stable operation of the entire ship power system, reduce the probability of failure, and improve the safety and reliability of ship navigation.
Improve energy utilization: through the heat exchange process, part of the heat in the cooling water of the diesel engine can be recycled and used to heat other media that need to be preheated, such as fuel oil, domestic water, etc., so as to improve the utilization rate of the ship's energy and reduce energy consumption.
