CN103423034B - The method of operation large cross-head reciprocating piston type internal combustion motor and motor - Google Patents

The method of operation large cross-head reciprocating piston type internal combustion motor and motor Download PDF

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Publication number
CN103423034B
CN103423034B CN201310142195.9A CN201310142195A CN103423034B CN 103423034 B CN103423034 B CN 103423034B CN 201310142195 A CN201310142195 A CN 201310142195A CN 103423034 B CN103423034 B CN 103423034B
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gas outlet
recycle gas
opening stage
firing chamber
scavenging
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CN103423034A (en
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P·斯基约达格
Z·斯托亚科维克
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MAN Energy Solutions Filial af MAN Energy Solutions SE
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MAN Diesel and Turbo Filial af MAN Diesel and Turbo SE
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/40—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with timing means in the recirculation passage, e.g. cyclically operating valves or regenerators; with arrangements involving pressure pulsations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/0276—Actuation of an additional valve for a special application, e.g. for decompression, exhaust gas recirculation or cylinder scavenging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/41—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories characterised by the arrangement of the recirculation passage in relation to the engine, e.g. to cylinder heads, liners, spark plugs or manifolds; characterised by the arrangement of the recirculation passage in relation to specially adapted combustion chambers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

The present invention relates to a kind of method for operating large cross-head reciprocating piston type internal combustion motor and this explosive motor, this motor comprises at least one cylinder and has via the crosshead functional entity piston relevant to bent axle, burn in a combustion chamber during the work cycle of motor and introduce pressurization scavenging gas and perform scavenging, products of combustion is recirculation at least in part, wherein cylinder first end waste gas by open waste gas outlet and recycle gas by open recycle gas outlet pass through from firing chamber; Recycle gas outlet is opened repeatedly during the work cycle of motor, gas is all allowed to pass through each time, wherein the first time opening stage of recycle gas outlet at least started before the scavenging of firing chamber starts, last opening stage piston towards first end stroke during perform and substantially complete after scavenging gas is incorporated into firing chamber, can reduce thus arrange outlet to recycle gas valve thermal stress and extend its life-span.

Description

The method of operation large cross-head reciprocating piston type internal combustion motor and motor
Technical field
The present invention relates to a kind of method for operating large cross-head reciprocating piston type internal combustion motor, this motor comprises at least one cylinder around firing chamber, described firing chamber is also by corresponding piston gauge, described motor has via the crosshead functional entity described piston relevant to rotatable output crank shaft, and in a combustion chamber, during the work cycle of motor, particularly realize burning by the fuel be directly fed in described firing chamber, and introduce the scavenging gas execution scavenging of pressurizeing by the second end from described cylinder towards the first end of this cylinder subsequently, the products of combustion recirculation at least in part wherein produced by burning in described firing chamber, to reduce the NO being discharged into the waste gas air subsequently from described motor xcontent, wherein at the first end of described cylinder, waste gas passes through from described firing chamber by opening waste gas outlet, and recycle gas passes through from described firing chamber by opening recycle gas outlet.
Background technique
The motor of above type is described in DE 10 2,005 057 207 A1, wherein, before the opening stage that recycle gas exports starts from the opening stage of waste gas outlet.Reason is, in order to recirculation needs to obtain undiluted combustion gas.But this gas is very warm and pressurized, thus be seriously subject to thermal stress for the valve controlling the recycle gas outlet that combustion gas that are very hot for this and pressurization pass through.In order to eliminate this problem in DE 10 2,005 057 207 A1, the outlet valve being alternately used as to pass through for combustion gas and two the recycle gas valves being used as the inlet valve passed through for recycle gas are proposed.But this device with two valves is very complicated and expensive.
In US 2004/0103863 A1, describe another motor of above type, wherein, recycle gas outlet is opened repeatedly during each work cycle of motor.First time opens and starts together with the opening of waste gas outlet.Completed before closed waste gas outlet and opened for the last time.Thus, the valve controlling recycle gas outlet activated in the work cycle stage for discharging hot waste gas.Reason for this reason, needs to worry, all contact with hot waste gas during its each opening stage for the described valve controlling recycle gas outlet, and therefore its thermal stress is not suitably reduced by twice or more secondary opening.
According to the another motor of the known above type of JP 3213616A, wherein, the opening stage of recycle gas outlet, after the opening stage of waste gas outlet, only has a small amount of intersection.Therefore, recycle gas only comprises a small amount of products of combustion, thus reduces NO xeffect very little.
Summary of the invention
Therefore, according to above prior art, the object of the invention is to improve for operating the method for two stroke reciprocating piston type engines with combustion gas recirculation and improving this motor, making can not only the appropriate products of combustion of recirculation, and guarantee the suitable cooling of combustion gas valve, and however structure expenditure can quite be lacked.
Visible, central scope of the present invention is, during the work cycle of motor, waste gas outlet is opened and the valve arranged mutually activated repeatedly, all allows gas to pass through each time.In this work cycle, the first time opening stage (or the actuating of the valve arranged mutually) of waste gas outlet at least started before the scavenging of firing chamber starts, and the last opening stage of waste gas outlet (or the actuating of the valve the arranged mutually) scavenging in firing chamber performs after substantially completing.
Due to recycle gas valve first time opening stage in working stroke, during this stage, therefore advantageously obtain undiluted combustion gas for recirculation object, this is for the NO of the waste gas be drawn out to subsequently in air xthe suitable minimizing of content is very useful.By introducing the other opening stage of this valve, the counter productive that gas very hot during the groundwork of recycle gas valve impacts advantageously is eliminated, this is owing to occurring during next work cycle once before thermal shock, there is the period remaining lower scavenging gas temperature in a combustion chamber in this other opening stage, thus the favourable cooling of the recycle valve by thermal stress is caused by the flowing of the gas pressurizeed from the appropriateness of firing chamber, this causes significantly less thermal stress and saving function also therefore to cause the comparatively long life of described each element.Additional advantage of the present invention is, recycle gas valve is enough and does not need each cylinder to have multiple this valve, and this causes the simple and structure of cheapness.
Thus, for the last opening stage of recycle gas valve, the time window during the compression up stroke of piston has been confirmed as favourable possibility.This advantageously occurs as early as possible after closedown exhaust gas valve, thus increase many merits by the compression heating from piston during the up stroke of piston before, be in the coldest, minimum pressurization and be therefore also that the scavenging gas of most inexpensive state can leave firing chamber, so that cooling recirculated gases valve collar border.Preferably, there is the crankangle interval of about 250 to 280 degree after tdc in this last opening stage.
Accompanying drawing explanation
Hereinafter, explain Working Examples of the present invention in detail with reference to appended accompanying drawing, wherein:
Fig. 1 display is according to the schematic diagram of large cross-head reciprocating piston type internal combustion motor of the present invention; And
What Fig. 2 showed gas passageway opens area and the cylinder pressure chart with the crankangle change after TDC.
Embodiment
Main use field of the present invention is large cross-head piston internal-combustion engine field, is usually implemented as uniflow scavenged two-stroke diesel and/or the gas engine for advancing marine object and/or operation power station etc.
Motor shown in Fig. 1 comprises crankcase 1, and this crankcase 1 is furnished with at least one cylinder 2 (being generally the exhaust casing be made up of multiple cylinder 2).Each cylinder 2 comprises the reciprocating piston 3 as the moving boundary of firing chamber 4.Piston 3 cooperates with the bent axle 5 being arranged in crankcase 1 by means of piston rod 6, crosshead 7 and connecting rod 8.The scavenging port 9 as the line of rabbet joint is furnished with in the bottom (at the second end) of cylinder 2.Thus scavenging port 9 can by piston 3 by also being controlled by this piston.In the region of scavenging port 9, each cylinder 2 is connected with the scavenging gas receiver 11 shared by scavenging gas pipeline 12 around, this scavenging gas passage by scavenging gas path 10.During the work schedule of piston 3, by from above-mentioned second end of described cylinder towards faced by upper end (first end) introduce the scavenging gas of pressurization, in firing chamber 4, there is burning and realize the uniflow scavenging of firing chamber 4 before producing combustion gas.Burning is realized by the usual fuel be fed in firing chamber by fuel injection mechanism (not shown).The fuel of usual employing spray pattern is for performing as an indivisible operation.But also possibly, partly introduce fuel ahead of time to carry out lighting and performing main injection subsequently as pilot injection.When using inflammable gas operation motor, can do like this for the pilot injection of lighting the fuel of gas.Usually, fuel is introduced directly into firing chamber 4.But, arrange to the precombustion chamber of firing chamber if be furnished with, then fuel is partly incorporated in this precombustion chamber ahead of time and is also fine as pilot injection.
On the top of cylinder 2, the waste gas outlet controlled by the exhaust gas valve 14 arranged mutually and the adjacent recycle gas controlled by the recycle gas valve 16 arranged mutually is provided to export 15.Exhaust gas valve 14 is activated by the independent actuators arranged mutually with recycle gas valve 16, and described actuator is controlled according to the Operational Limits of motor.The waste gas outlet 13 of each cylinder 2 is connected via the waste gas receiver 18 that curved part 17 is common with multiple/all engine cylinder.The waste gas collected in waste gas receiver 18 is directed to turbosupercharger 19, and this turbosupercharger comprises by exhaust-driven turbine and the compressor supplying air via the air conduit 20 comprising air-cooler 21 to scavenging gas receiver 11.Although do not show, other devices etc. for gas treatment and/or Energy harvesting can be inserted into/add to each position in loop shown in Fig. 1.
The waste gas leaving the turbine of turbosupercharger is directly released into peripheral region at this.The low NO of this gas xcontent is desired.In order to realize this object, the combustion gas generated by the burning in firing chamber 4 are by partly recirculation.For this purpose, recycle gas outlet 15 is connected to recirculation conduit 22, this recirculation conduit can lead in any mechanism of scavenging gas system, such as, lead to scavenging gas receiver 11 or such as to lead in the scavenging air pipeline 20 in the Working Examples shown in Fig. 1 etc.Recirculation conduit 22 connects from recycle gas receiver 23, and this recycle gas receiver supplies by exporting from the recycle gas of cylinder 2 pipeline 24 connected 15.In recycle gas receiver 23 downstream, be furnished with the control valve 26 for controlling flow rate in this example.In control valve 26 downstream, provide recycle gas treatment device 25 at this, this recycle gas treatment device such as can comprise washing machine, cooler and water smoke trap.
The illustrated loop of Fig. 1 is example system example purely, and it comprises some typical elements and the necessary total flow circuits for waste gas and scavenging gas.Certainly, some processing elements can be removed, and other suitable processing elements can be included in the interior flow circuits of compressor downstream and turbine upstream.When not deviating from scope required for protection, other processing elements of system also can be included in compressor upstream and/or turbine downstream.Further, recirculation conduit 22 can be connected to scavenging loop in the arbitrfary point between scavenging port and compressor.Certainly, functional element also can be implemented to and be different from described element.
According in the chart of Fig. 2, curve 30 represents that scavenging port 9 opens area towards firing chamber 4, and what curve 31 showed waste gas outlet 13 opens area, and curve 32a, 32b illustrate recycle gas outlet 15 opens area.Curve 33 represents the pressure in cylinder pressure, i.e. firing chamber 4.On axis of abscissas, the rotational position of bent axle 5 be labeled as a work cycle from the crankangle of 100 ° to 300 °; 180 °, position corresponds to lower dead centre (BDC), and 0 ° and 360 ° (outside coordinate axle heads) correspond respectively to upper dead center (TDC).
As shown in Figure 2, be only opened once during a work cycle corresponding to the scavenging port 9 of curve 30 and the waste gas outlet 13 that corresponds to curve 31.In contrast, recycle gas outlet 15 is opened repeatedly, as shown in two curves 32a, 32b during a work cycle.Therefore, arrange to be controlled as to the actuator of recycle gas valve 16 and make valve 16 correspond to curve 32a, 32b to open.Usually two opening stage 32a, 32b are provided.First opening stage is for collecting the undiluted products of combustion for recirculation.A rear opening stage is used for cooling recirculated gases valve 16 and environment thereof.
Thus, preferably, first opening stage (curve 32a) of recycle gas outlet 15 starts at the latest together with the opening of waste gas outlet 13, and substantially completes when the scavenging of firing chamber 4 starts.According in the example of Fig. 2, the opening stage of scavenging port 9 be TDC after from the crankangle of 140 ° to 220 °, namely symmetrically from 40 ° of crankangles after ° crankangle to BDC of 40 before BDC, and the opening stage of waste gas outlet 13 be TDC after from the crankangle of 120 ° to 240 °, namely also symmetrically from 60 ° of crankangles after ° crankangle to BDC of 60 before BDC.Although two intervals just mentioned are described as about BDC symmetrical, the mechanism for making these intervals asymmetrical positioned around BDC can be comprised in protected motor.First opening stage (curve 32a) of recycle gas valve 16 start from exhaust gas valve 13 open beginning before the crankangle of about 5 °, and its terminate with scavenging port 9 open the beginning only crankangle of overlapping approximate 10 °, thus in intersectional region, recycle gas valve 16 is almost completely closed, and scavenging port 9 has just been opened a little, therefore utilizes low pressure and low temperature scavenging gas to dilute the recycle gas collected and be substantially safe from danger.
As mentioned above, curve 33 corresponds to the pressure in firing chamber 4.This pressure reduces along with opening of waste gas outlet 13 and during the opening stage of scavenging port 9, is in the stress level of scavenging system.After closing scavenging port 9 and waste gas outlet 13 (this according to about 220 ° or the 240 ° of crankangles after betiding TDC in the example of Fig. 2), pressure in firing chamber 4 increases due to the up stroke of piston 3, wherein this increase is slow as shown in 33a starts, but progression is increased as shown in the 33b of the right-hand member at curve 33.
Second opening stage (curve 32b) of recycle gas outlet 15 should the above-mentioned progression of pressure in firing chamber 4 increase start before complete.On the other hand, this second opening stage start should generation after closing scavenging port 9 and waste gas outlet 13.According in the example of Fig. 2, as shown in curve 32b, the second opening stage of recycle gas outlet 15 occurring from the crankangle of about 250 ° to 280 ° after tdc, thus meets above condition.Described angle value is the crankangle of approximate ± 10 °.Second opening stage is slightly shorter than the first opening stage at this.
When not having recycle gas to export second opening stage of 15, pressure increase is undertaken according to the dotted line in Fig. 2.Described second open cause pressure increase as a small amount of delay shown in 33c.As according to curve 33b, and do not have compared with the second opening stage (dotted line 33b, 33c), to open corresponding to second of curve 32b the chamber pressure yet causing slightly reducing.But this pressure reduces easily to be compensated, such as, compensate by slightly increasing scavenging system pressure, more early closedown exhaust gas valve etc.But second of recycle gas valve 16 opens the compression pressure that can also be used in control combustion room 4.
Curve shown in Fig. 2 is typically for clear illustrative object.For any specific embodiment of the present invention, the curve of correlation engine can in maximum value, in curve shape and also different in the location mutual to some extent about crankangle.Further, particularly the illustrated of curve 30 and 31 can by other mechanisms influence unrelated to the invention about 180 ° (i.e. BDC) symmetry properties more or less.Design of the present invention this be second open pressure that period (curve 32b) evicts cooled gas by recycle gas outlet 15 via recycle gas valve 16 from firing chamber 4 by have its up stroke piston closedown firing chamber and realize.
According in the Working Examples of Fig. 1, during two opening stage of recycle gas outlet 15, recycle gas receiver 23 is filled by the gas left from firing chamber 4.In receiver 23, the gas received mixes, and the gas of all mixing is recycled via recirculation conduit 22 and directed through treatment device 25.But also possibly and can run in particular case, the gas of the first opening stage and the gas of the second opening stage are branched to different downstream passages by the mechanism be applicable to.Thus, the gas of the first opening stage can be directed through treatment device 25, and the gas of the second opening stage can directed through getting around receiver 23 and treatment device 25 extra loop and in treatment device 25 downstream or at least at the gas and vapor permeation of its washing machine downstream and the first opening stage.In another embodiment, can also by the air release of the second opening stage or in other local uses arbitrarily.
Realize mechanism of the present invention advantageously can be arranged to combine with the motor of new production.But the available engine providing the method for motor of the present invention can also comprise not protected by appended any claim at present improves necessary new mechanism.For the motor at present without CGR/EGR system, the improvement of new mechanism consists essentially of in the cylinder head at least one recycle gas outlet valve 16 being installed to existing or applicable replacing, and adds egr conduit and required logic and physical control element.For the motor with mounted traditional C GR valve and CGR loop, carry out improving that the new mechanism of this motor acquisition innovation can be comprised substantially and add/revise required logic and physical control element, to set up new rear opening stage (curve 32b) at least one recycle gas outlet valve 16.
For clarity, the work cycle/sequential of the cylinder in claim is specified to two the continuous print piston full strokes (downward stroke and up stroke) of the first cylinder end TDC place from having exhaust gas valve 14.Certainly; due to the working principle of cycle characteristics and this motor; the initial range of method required for protection and motor is also extended to other restrictions comprising cylinder circulation in logic; as long as piston towards cylinder first end stroke during, corresponding " first " secondary opening stage (curve 32a) of recycle gas exit mechanism 15 is relevant to opening with the termination towards cylinder first end of scavenging gas entrance of scavenging port 9 similarly respectively with the feature locations of corresponding " finally " opening stage (curve 32b).

Claims (14)

1. one kind for operating the method for large cross-head reciprocating piston type internal combustion motor, described motor comprises at least one cylinder (2) around firing chamber (4), described firing chamber is also by corresponding piston (3) gauge, described motor has via crosshead functional entity (7) the described piston (3) relevant to rotatable output crank shaft (5), and during the work cycle of described motor, burning is realized in described firing chamber (4), and introduce the scavenging gas execution scavenging of pressurizeing by the second end from described cylinder (2) towards the first end of this cylinder subsequently, the products of combustion generated by burning in wherein said firing chamber (4) is by recirculation at least in part, to reduce the NO being discharged into the waste gas air subsequently from described motor xcontent, wherein at the first end of described cylinder (2), waste gas by open waste gas outlet (13) from described firing chamber (4) by and recycle gas by open recycle gas outlet (15) pass through from described firing chamber (4), wherein said recycle gas outlet (15) is opened repeatedly during the described work cycle of motor, gas is all allowed to pass through each time, the first time opening stage of wherein said recycle gas outlet (15) at least started before the scavenging of described firing chamber (4) starts, and the last opening stage of described recycle gas outlet (15) described piston towards cylinder first end stroke during perform and scavenging gas completed after the second end of cylinder is incorporated into firing chamber (4).
2. method according to claim 1, wherein, the first time opening stage of described recycle gas outlet (15) starts simultaneously with opening of waste gas outlet (13) and stops when the scavenging of firing chamber (4) starts at the latest.
3. method according to claim 1 and 2, wherein, the second time opening stage of described recycle gas outlet (15) is described last opening stage, and this last opening stage starts after waste gas outlet (13) is closed.
4. method according to claim 3, wherein, the last opening stage of described recycle gas outlet (15) start from upper dead center after the crank angle range of 250 ° ± 10 °.
5. method according to claim 2, wherein, the last opening stage of described recycle gas outlet (15) end at upper dead center after the crank angle range of 280 ° ± 10 °.
6. method according to claim 5, wherein, the last opening stage of described recycle gas outlet (15) is in the crank angle range of 240 to 290 ° after upper dead center.
7. method according to claim 2, wherein, recycle gas outlet (15) described in the time length ratio of the last opening stage of described recycle gas outlet (15) first time opening stage time length.
8. method according to claim 1, wherein, all gas passed through from firing chamber (4) via recycle gas outlet (15) in all opening stage of same cycle period is by common recirculation.
9. method according to claim 1, wherein, the gas passed through from firing chamber (4) via recycle gas outlet (15) during first time opening stage is for EGR, and be branched in recycle gas outlet (15) downstream from the gas that firing chamber (4) are passed through via recycle gas outlet (15) during the follow-up opening stage of same circulation may purposes for other.
10. a large cross-head reciprocating piston type internal combustion motor, this motor comprises at least one cylinder (2) around firing chamber (4), and described firing chamber is also by corresponding piston (3) gauge, and described motor has:
Via the described piston (3) that crosshead functional entity (7) is relevant to rotatable output crank shaft (5);
At the first end of described cylinder (2), for mechanism (13) and the mechanism (15) that exports at least one recycle gas of at least one waste gas outlet of combustion gas, this Liang Ge mechanism (13,15) can be independently controlled by the valve system (14 or 16) of corresponding arranging; And
At the second end of described cylinder (2), for at least one scavenging port (9) that scavenging gas enters towards cylinder first end, this at least one scavenging port (9) is controlled by described piston (3), wherein arrange and be opened repeatedly during two full strokes of continuous print piston to each recycle gas valve system (16) of the mechanism (15) for recycle gas outlet
It is characterized in that, first time opening stage for the mechanism (15) of recycle gas outlet is at least opened to start before the scavenging of cylinder first end at scavenging port (9), and for the mechanism (15) of recycle gas outlet last opening stage described piston (3) towards cylinder first end stroke during perform, and to be completed after cylinder first end enters by scavenging port (9) at scavenging gas.
11. motors according to claim 10, wherein, arrange and during two full strokes of continuous print piston, be opened twice to each recycle gas valve system (16) of mechanism (15) for recycle gas outlet, and wherein for the mechanism (15) of recycle gas outlet second time, be also last opening stage execution after closedown exhaust gas valve mechanism (14).
12. motors according to claim 10, wherein, the crank angle range of after being in upper dead center for the last opening stage of mechanism (15) of recycle gas outlet 250 ± 10 to 280 ± 10.
13. motors according to claim 10, wherein, this motor has the egr conduit (24,22) be connected with the mechanism (15) exported for recycle gas of one or more arranging further, and described egr conduit is filled by the gas passed through from firing chamber (4) when the first time opening stage of the mechanism (15) for recycle gas outlet arranged.
14. motors according to claim 13, wherein, this motor has the one or more gas treatment/control gear (25,26) be embedded in egr conduit (24,22), and has the described egr conduit leading to further and lead in the pressurization scavenging gas pipeline (12,20) of scavenging port (9).
CN201310142195.9A 2012-05-24 2013-04-23 The method of operation large cross-head reciprocating piston type internal combustion motor and motor Active CN103423034B (en)

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DKPA201200362 2012-05-24

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