紅菱重工--產品與服務--NIIGATA重油發電機

28HLX Series

Niigata is proud to introduce the new 28HLX medium speed high performance diesel engine series. With a bore & stroke of 280×400mm, at 720 or 750 rpm, this model packs a maximum continuous rating of 375 kWm per cylinder at standard reference conditions. Fuel consumption rate is improved to very competitive low levels and this model is designed to efficiently burn low grade bunker fuel of up to 700 cSt at 50degC
　

Each engine component is a successful product of Niigata's vigorously continuing
R & D program in design and manufacturing processes, towards higher reliability and efficiency. Important features of this engine are the rigid monobloc hanger type crankcase, highly balanced large journals robust crankshaft with high capacity bearings, horizontal split connecting rod large-end caps, integral machine cams with the segmented cam shaft per cylinder, more effective cooling, turbocharging and lubrication, high pressure direct fuel injection system, among other improvements.

The engine design also painstakingly took into consideration the important aspects of easy and simple maintenance featuring wider crankcase doors, 4-stud cylinder heads, swing arm type cam followers, trunk type manifolds and channels for the charge air and jacket cooling water, all built-in in the crankcase.

With a total of over 20 million kWm of hard working diesel engines delivered worldwide over the past 8 decades, Niigata, with this vast experience has made the 28HLX another technological breakthrough in the field of medium speed, medium bore diesels. This compact high performance high output and environment friendly engine model is undoubtedly a step ahead in the global search for the ideal engine to satisfy the specific size range in power or industrial requirements aimed towards healthier returns on investments.
　

Manufactured in our ISO 9001-certified OHTA and NIIGATA engine plants the 28HLX comes in convenient sizes from 6 in-line to 18 Vee cylinder configurations with typical ratings of 2 160 to 6 750 kWm.


FEATURES
Optimized Combustion Efficiency Features
	* NCCS (Niigata Compact Constant Pressure Turbocharging System). * 25% output capacity rise compared to the conventional engine. * Higher maximum combustion pressure (Pmax) of up to 20 MPa. * Brake mean effective pessure raised to 2.44 MPa, mean piston speed raised to 10.0 m/s, 18% and 8% higher respectively than the conventional diesel engine. * Specific output rate of 24.4 MPa.m/s noted as the highest level in the world for this engine size (The highest for conventional Niigata diesel engines has been 22.5 MPa.m/s). * High pressure, 147.1 MPa, short duration fuel injection system. * Cylinder liners equipped with Fire Rings. * Capable of burning low grade bunker fuel of up to 700 cSt at 50degC

Major Components Designed and Furnished for Superior Reliability, 　Low Vibration
	* Designed by FEM (Finite Element Method) stress calculation. * Stress measurement confirmation by component element tests. * NCI (Nodular cast iron) highly rigid monobloc double-walled hanger type crankcase. * Special chrome-molybdenum steel forged crankshaft with large main and crankpin journals and carefully counterweighted for high degree of balance. Very low vibration levels.

Simplified Maintenance and Inspection Features
	* Four-stud cylinder head fastening. * Wide air trunk and cooling water built-in with crankcase. * Special hydraulic tools for disassembly and assembly work. * Swing arm type cam followers. * Unitized per cylinder segmented cam shaft. * Total weight and component parts reduced by 12% and 25%, respecitively, compared to similar conventional models.

　GENERAL SPECIFICATIONS

MODEL	6L28HLX	8L28HLX	12V28HLX	16V28HLX	18V28HLX
Type	Turbo charged, 4 cycle diesel engine with air cooler
Configuration	In-line-form		Vee-form
Cylinders	6	8	12	16	18
Bore	280 mm
Stroke	400 mm
Displancement	24.63 L/cyl.
Rotation direction	Clockwise (Viewing from the coupling side)
Starting system	By compressed air
Fuel injection system	Direct injection
Cooling method	Water cooled
Turning method	Gear type, motor drive
Fuel oil	Diesel oil or heavy fuel oil

　ENGINE OUTPUT

MODEL	6L28HLX	8L28HLX	12V28HLX	16V28HLX	18V28HLX
Frequency	50/60 Hz
Max . combustion pressure	20 MPa (204 kgf/cm²)
Mean effective pressure	2.44 MPa (24.85 kgf/cm²)

Engine output for 50 Hz	2 250 kWm	3 000 kWm	4 500 kWm	6 000 kWm	6 750 kWm
Engine output for 50 Hz	(375 kWm/cyl.)
Generator output	2 150 kWe	2 880 kWe	4 330 kWe	5 790 kWe	6 510 kWe
Engine speed	750 min^-1 (750 rpm)
Mean piston speed	10.0 m/s

Engine output for 60 Hz	2 160 kWm	2 880 kWm	4 320 kWm	5 760 kWm	6 480 kWm
Engine output for 60 Hz	(360 kWm/cyl.)
Generator output	2 060 kWe	2 760 kWe	4 160 kWe	5 550 kWe	6 250 kWe
Engine speed	720 min^-1 (720 rpm)
Mean piston speed	9.6 m/s

>>	The output figures shown in the tables represent the rating under the following standard reference conditions. If site conditions are different from the standard reference conditions, the output shall be adjusted from the above figures. Standard Reference Conditions :
		1) Ambient temperature: 40degC 2) Cooling water (air cooler inlet) temperature: 35degC 3) Atmospheric pressure: 101.3 kPa (760 mm Hg) 4) Generator output is subject to generator efficiency

　DIMENSIONS & MASS

MODEL	Principal Dimensions (mm)					Mass (t)
MODEL	A	B	C	D	E	Engine	Generator
6L28HLX	4 825	2 780	7 605	2 855	2 335	23	10
8L28HLX	5 920	3 250	9 170	2 855	2 406	31	13
12V28HLX	6 315	3 450	9 765	3 487	2 527	38	17
16V28HLX	7 035	3 550	10 585	3 335	2 553	50	20
18V28HLX	8 415	3 550	11 965	3 785	2 780	57	22

Note: The mass and dimensions of generators shall be subject to electrical design.

　

　DESIGN & CONSTRUCTION FEATURES

Pistons

Connecting Rods

Cylinder Liners

Cam Shafts

Cylinder Heads

1 Crank Case
	Made of NCI (Nodular Cast Iron), the mono- block type double-walled hanger type box structure crankcase/cylinder block is carefully designed for sufficient strength and rigidity with low vibration characteristics necessary for the high Pmax of this engine. The wide area low friction loss charge air chamber, jacket water cooling channels, and camcases are cast-integrated into the block.

2 Crankshaft &Main Bearings

The crankshaft is forged from a special chrome-molybdenum steel stock. The large main and crankpin journals keep the bearing load and torsional stresses low even with the high Pmax of this engine. Carefully designed balance weights ensure a very high degree of balance factor for sufficient and consistent bearing oil film thicknees. Thin-backed 3-layer kelmet type bearings of high surface pressure resistance are provided for the main and crankpin journals for long bearing service life.

3 Pistons

Lightweight pistons of improved design for high Pmax capacity is sucessfully adopted for this engine. Three compression rings and one oil control ring per piston, are provided. The wide cooling spaces in the crowns ensure a very effective cooling by forced feed lubricating oil shaking system. The thin-walled skirt reduces total piston weight and inertia and easily harmonizes with the expansion coefficient of the cylinder liner.

4 Connecting Rods
	Made of special forged steel the connecting rod is of the two-piece design consisting of a horizontal-split large end bearing housing to suit the large diameter crankpin for improved reliability and lower bearing load stress.

5 Cylinder Liners

The liners are centrifugal cast and nitrided internally. Very low wear rate is assured. Replaceable fire rings are fitted at the top portion combustion zone. This reduces polishing of walls by the solid carbon particles from combustion, thus keeping the desired wall roughness for oil film dwell optimizing the function of the piston rings for longer periods with reduced lubricating oil consumption The upper engaging section of the liners has a rigid thick wall structure with bored water cooling system for uniform thermal stress needed for high Pmax operation. The lower portion of the liners are air-cooled with the charge air effectively reducing cold corrosion wear.

6 Cam Shafts
	The cam shaft consists of segments, unitized per cylinder with the fuel, air intake and exhaust cams machined integrally from a single special forged steel stock. Each segment is bolted axially to that of the next cylinder's through a common journal segment. By this system maintenance work is greatly simplified.

7 Cylinder Heads

The cylinder heads are made of CV (compacted vermicular) cast iron which optimizes the distribution of mechanical stress and provides better thermal conductivity much needed for high Pmax operation. Thermal stress is reduced by bore-cooling. A four-stud design is applied to provide for larger intake and exhaust ports, reducing air and gas flow losses. Maintenance work, consequently, is also simplified.

8 Exhaust Valves
	Nimonic (special high corrosion resistant alloy) exhaust valves with mechanical "rotomat" rotators are applied for long reliable operation.

9 Fuel InjectionPumps & Fuel Injectors
	To realize higher combustion efficiency and better fuel economy high pressure fuel injection pumps (147.1 MPa), mini-mass injector, and short cycle injection pipe thorough the cylinder head are applied. The injector nozzle spray holes are specially treated to increase discharge coefficient thus improving combustion and prolonging nozzle tip service life.