Deep recycling heat from exhaust gases and compressed air of modern low speed engine

2017 ◽  
Vol 0 (3) ◽  
Author(s):  
Volodymyr P. Shostak ◽  
Anton Yu. Manziuk
Keyword(s):  
Compressed Air ◽  
Low Speed ◽  
Exhaust Gases ◽  
Speed Engine

scholarly journals ОХОЛОДЖЕННЯ ПОВІТРЯ НА ВХОДІ МАЛООБЕРТОВОГО ДВИГУНА ЕЖЕКТОРНОЮ ХОЛОДИЛЬНОЮ МАШИНОЮ ПРИ ЕКСПЛУАТАЦІЇ СУДНА В ТРОПІЧНИХ УМОВАХ

2020 ◽  
pp. 17-21
Author(s):  
Роман Миколайович Радченко ◽  
Максим Андрійович Пирисунько ◽  
Нiн Чен ◽  
Баочен Хан
Keyword(s):  
High Efficiency ◽  
Waste Heat ◽  
Cooling Water ◽  
Climatic Conditions ◽  
Design Solution ◽  
Air Cooling ◽  
Low Speed ◽  
Exhaust Gases ◽  
Main Engine ◽  
Speed Engine

The efficiency of air cooling at the inlet of the main low-speed engine turbocharger of a transport vessel during operation in tropical climatic conditions on the Shanghai-Singapore-Shanghai route was analyzed. A feature of the tropical climate is the high relative humidity, respectively, moisture content at its simultaneously high temperatures. The cooling of the air at the inlet of a low-speed engine with an ejector chiller by transforming the waste heat of exhaust gases into cold was studied. The ejector chiller is used as the most simple and reliable in operation. However, the efficiency of the transformation of heat into cold by ejector chillers is low - low thermal coefficients.A design solution of the system for cooling air at the inlet of the ship's main engine using the heat of the exhaust gases by an ejector chiller is proposed and analyzed. The effect of using the heat of the exhaust gases to cool the air at the engine inlet is analyzed taking into account the variable climatic conditions during the voyage of the vessel. It is shown that because of the insufficiently high efficiency of transforming the waste heat of the exhaust gases by an ejector chiller (low thermal coefficients), the obtained cooling capacity is not sufficient for cooling the air at the inlet of the turbocompressor during operation of a marine engine in tropical climatic conditions. Therefore, the possibility of use in the ejector chiller of additional heat of charge air, which is removed by cooling water, is also considered. It is shown that the use of the heat of exhaust gases and charge air for cooling the air at the engine inlet in an ejector chiller makes it possible to double decrease the air temperature at the inlet of the main engine by 20-30 °C when the vessel operates in tropical climatic conditions on a voyage lines Shanghai-Singapore-Shanghai. This, in turn, provides an almost twice fuel consumption reduction in compared with its reduction in the case when the ejector chiller uses only the heat of the exhaust gases.

Design and Service Experience of the Electronically Controlled ME Engine

2002 ◽  
Author(s):  
Thomas S. Knudsen ◽  
Ole Groene ◽  
Per Soerensen
Keyword(s):  
Operating Performance ◽  
Operating Costs ◽  
Service Experience ◽  
Valuable Data ◽  
Low Speed ◽  
Camless Engine ◽  
The Impact ◽  
Valve Control ◽  
Speed Engine

The Norwegian shipowner Odfjell has had more than one year’s experience of operating a vessel powered by an MAN B&W 6L60MC/ME low-speed engine capable of operating by electronic valve control, without a camshaft. During that period, the engine has run in both conventional and camless modes. Valuable data has been collected on the impact of camless engine technology, on operating performance, and on operating costs. Odfjell has now ordered a 7-cylinder S50ME-C engine, featuring electronic operation, for installation on a 37,500 dwt chemical tanker newbuilding.

scholarly journals Investigation on improving the thermal efficiency of a mini boiler fired with straight vegetable oils

2020 ◽  
Vol 24 (2 Part A) ◽  
pp. 713-722
Author(s):  
Maran Punnaivanam ◽  
Arumugam Krishnan
Keyword(s):  
Vegetable Oils ◽  
Rice Bran ◽  
Thermal Efficiency ◽  
Sunflower Oil ◽  
Rice Bran Oil ◽  
Supply System ◽  
Compressed Air ◽  
Exhaust Gases ◽  
Oil Blends ◽  
Air Supply

In the present work, straight sunflower oil and rice bran oil blended with diesel have been used as fuel diesel in a mini boiler. The thermal efficiency of the boiler and emission levels in the exhaust gases have been investigated by burning the oil blends of varying proportions ranging from 0-50%. An additional air supply system and compressed air atomization of fuel with a new burner have been used to improve the thermal efficiency of the mini boiler. Results revealed that the addi?tional air supply improved the thermal efficiency up-to 7% and reduced the CO and HC emission up-to 40%. The use of compressed air atomization further increased the thermal efficiency up-to 4% and reduced the CO and HC emission up-to 70%.

Research on influence and demand of Miller cycle based on the coupling of marine low-speed engine and turbocharger

2021 ◽  
pp. 117624
Author(s):  
Dawei Wang ◽  
Lei Shi ◽  
Heng Zhang ◽  
Xiaofeng Li ◽  
Yuehua Qian ◽  
...  
Keyword(s):  
Miller Cycle ◽  
Low Speed ◽  
Speed Engine

Study and Fabrication of Compressed Air Engine

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
J P Yadav ◽  
Bharat Raj Singh
Keyword(s):  
Cost Analysis ◽  
New Technologies ◽  
Cooling System ◽  
Cost Effective ◽  
Mechanical Efficiency ◽  
Compressed Air ◽  
Operational Cost ◽  
Efficiency Cost ◽  
Frictional Forces ◽  
Speed Engine

As the world is hard pressed with the energy and fuel crises, compounded by pollution of all kinds, any technologies that bring out the solutions to this problem is considered as a bounty. In one of such new technologies, is the development of a new engine called as compressed air engine which does not require any of the known fuels like diesel, petrol, CNG, LPG, hydrogen etc. this works using only compressed air. This replaces all types of to-date known fuels and also permanently solves the problems of pollution as its exhaust is clean and cool measured practically as low as 5°C. A proto type, a horizontal, single cylinder low speed engine was modified to run on compressed air. Since this engine runs only on high pressure compressed air, the exhaust of which is undoubtedly only air, making it a zero pollution engine. No heat is generated because there is no combustion of fuel, hence this engine needs no cooling system and it result in reduced cost, weight, volume and vibration. Early cost analysis shows that it's very cost effective and the operational cost is ten times less than that of petrol or diesel. Experimental analysis were carried out on this modified engine to find out its performance characteristics like brake power, mechanical efficiency, overall efficiency, air to Air ratio, volumetric efficiency, cost analysis etc. Though the efficiencies were low as the frictional forces were high for the proto designed engine, however the concept can be applied on a professionally designed engine to improve its performance.

Modeling Non-Newtonian Piston Skirts EHL in the Initial Engine Start Up

2010 ◽  
Author(s):  
Syed Adnan Qasim ◽  
Usman F. Chaudhri ◽  
M. Afzaal Malik ◽  
Riaz A. Mufti
Keyword(s):  
High Speed ◽  
Relaxation Times ◽  
Radial Clearance ◽  
Solution Technique ◽  
Engine Operation ◽  
Low Speed ◽  
Start Up ◽  
Piston Skirts ◽  
Engine Start ◽  
Speed Engine

In the normal high speed engine operation at small piston-to-bore radial clearance, elastohydrodynamic lubrication (EHL) of skirts and non-Newtonian lubricant behavior prevent adhesive wear, but in the initial engine start up, the large clearance, low speed and absence of EHL, cause start up wear. This study models 2-D upper convected Maxwell viscoelastic EHL of piston skirts at small radial clearance in a few initial low speed engine start up cycles by solving the Reynolds equation and using the inverse solution technique. The numerical analysis incorporate characteristic lubricant relaxation times and a perturbation method to predict and compare hydrodynamic and EHL pressures and film profiles. The effects of viscoelasticity on the lubricant characteristics, transverse eccentricities of piston, film thickness, and pressure fields in the hydrodynamic and EHL regimes are investigated. This study suggests that EHL film is formed at very small piston-to-bore radial clearance at low start up speed under assumed conditions to prevent start up wear as viscoelasticity produces a beneficial effect on piston skirts lubrication in the initial engine start up.

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