KR20120018545A - A lean burn type of two stroke gas engine - Google Patents

A lean burn type of two stroke gas engine Download PDF

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Publication number
KR20120018545A
KR20120018545A KR1020100081461A KR20100081461A KR20120018545A KR 20120018545 A KR20120018545 A KR 20120018545A KR 1020100081461 A KR1020100081461 A KR 1020100081461A KR 20100081461 A KR20100081461 A KR 20100081461A KR 20120018545 A KR20120018545 A KR 20120018545A
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South Korea
Prior art keywords
pressure gas
cylinder
low pressure
gas supply
low
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KR1020100081461A
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Korean (ko)
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박종국
김주태
안광헌
전병현
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현대중공업 주식회사
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Priority to KR1020100081461A priority Critical patent/KR20120018545A/en
Publication of KR20120018545A publication Critical patent/KR20120018545A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
    • F02B25/02—Engines characterised by using fresh charge for scavenging cylinders using unidirectional scavenging
    • F02B25/04—Engines having ports both in cylinder head and in cylinder wall near bottom of piston stroke
    • F02B25/06—Engines having ports both in cylinder head and in cylinder wall near bottom of piston stroke the cylinder-head ports being controlled by working pistons, e.g. by sleeve-shaped extensions thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
    • 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

Abstract

PURPOSE: A two-stroke gas engine using a low-pressure gas supply method is provided to improve cost efficiency because a gas pump for supplying high-pressure gas is not required by supplying low-pressure gas to the inside a cylinder. CONSTITUTION: A two-stroke gas engine(100) using a low-pressure gas supply method comprises a cylinder liner, a scavenging port(131), an exhaust valve(151), an ignition source, a low-pressure gas supply port(120), a low-pressure gas line(123), and a gas valve(121). The scavenging port is formed at the bottom end of the cylinder liner, and the exhaust valve is installed at the top end. The ignition source is installed in a cylinder head. The low-pressure gas supply port is formed at the center of the cylinder liner. The low-pressure gas line is connected to the low-pressure gas supply port. The gas valve is installed in the low-pressure gas supply port.

Description

저압가스 공급 방식의 2행정 대형 엔진{A Lean Burn Type of Two Stroke Gas Engine}A 2-stroke large engine with low pressure gas supply {A Lean Burn Type of Two Stroke Gas Engine}

본 발명은 2행정 대형 엔진에 관한 것으로서, 특히 엔진의 실린더 내부로 공급되는 가스연료를 저압상태로 공급하여 희박 예혼합 연소방식을 구현할 수 있게 구성한 것이다.The present invention relates to a two-stroke large engine, and is configured to implement a lean premixed combustion method by supplying gas fuel supplied into the cylinder of the engine at a low pressure.

2행정 대형 엔진은 디젤 연료 또는 이중 연료(가스 및 오일)를 사용하는 엔진이다. 기존의 2행정 대형 가스엔진은 연소공기가 실린더 라이너의 아래쪽에 위치한 소기구를 통해 공급되어 배기가스를 밀어내는 과정인 소기(scavenging)과정을 거치므로, 연소공기에 가스를 분사하여 혼합가스를 실린더 내부로 공급하면 배기가스와 혼합되어 배기구를 빠져나가게 되므로 배기변이 닫힌 이후에 고압으로 가스를 분사하도록 구성되어 있다.Two-stroke large engines are engines that use diesel fuel or double fuel (gas and oil). Conventional two-stroke large gas engines have a scavenging process, in which combustion air is supplied through a small device located under the cylinder liner to push the exhaust gas. When supplied to the inside is mixed with the exhaust gas to exit the exhaust port is configured to inject the gas at a high pressure after the exhaust valve is closed.

이와 같이 실린더 내부로 고압의 가스를 공급하기 위해서는 가스를 고압으로 압축하기 위해 가스펌프가 반드시 필요하다.As such, in order to supply high pressure gas into the cylinder, a gas pump is necessary to compress the gas to high pressure.

또한 분사된 가스는 실린더 내부에 있는 공기와 접촉해 확산연소과정을 거치게 됨에 따라 디젤 사이클과 동일한 연소현상을 가지게 되어 녹스의 발생량이 증가하게 되는 단점이 있다.
In addition, the injected gas is in contact with the air in the cylinder is subjected to the diffusion combustion process has the same combustion phenomenon as the diesel cycle has the disadvantage of increasing the amount of rust generated.

본 발명은 앞에서 설명한 바와 같은 종래 기술의 문제점을 해결하기 위하여 발명된 것으로서, 실린더의 내부로 저압가스를 공급할 수 있게 구성한 2행정 대형 엔진을 제공하는 데 그 목적이 있다.The present invention has been invented to solve the problems of the prior art as described above, and an object thereof is to provide a two-stroke large engine configured to supply low pressure gas into the cylinder.

상기와 같은 목적을 달성하기 위한 본 발명은 실린더 라이너의 하단에 소기구가 형성되며, 상기 실린더 라이너의 상단에는 배기변이 장착되며, 실린더 헤드에는 점화원이 장착된 2행정 대형 엔진으로서, 상기 실린더 라이너의 중간에 형성된 저압가스 공급포트와, 상기 저압가스 공급포트에 연결된 저압가스라인과, 상기 저압가스 공급포트에 장착된 가스밸브를 포함하는 것을 기술적 특징으로 한다.The present invention for achieving the above object is a small mechanism is formed on the lower end of the cylinder liner, the exhaust valve is mounted on the upper end of the cylinder liner, the cylinder head is a two-stroke large engine equipped with an ignition source, It characterized in that it comprises a low pressure gas supply port formed in the middle, a low pressure gas line connected to the low pressure gas supply port, and a gas valve mounted to the low pressure gas supply port.

또한, 본 발명의 바람직한 실시예에 따르면, 상기 실린더를 왕복운동하는 피스톤이 하사점에 위치할 때에 상기 소기구를 통해 연소공기가 유입되어 소기과정을 거치고, 상기 피스톤이 소기구를 폐쇄하였을 때에 상기 저압가스 공급포트를 통해 저압가스가 상기 실린더 내부로 유입되어 상기 피스톤에 의해 압착된다.
According to a preferred embodiment of the present invention, when the piston reciprocating the cylinder is located at the bottom dead center, combustion air is introduced through the small mechanism to undergo the scavenging process, and the piston is closed when the piston is closed. Low pressure gas flows into the cylinder through the low pressure gas supply port and is compressed by the piston.

앞서 설명한 바와 같이, 본 발명의 2행정 대형 엔진은 연소공기를 압착하기 전에 저압상태의 가스를 연소공기로 분사함으로써, 연소공기가 피스톤의 상승으로 가압되면서 가스와 혼합되어 예혼합 연소의 과정을 거치게 된다. 따라서 희박연소가 가능해진다. 오토 사이클(Otto Cycle)의 특성인 희박 연소 및 정적연소가 진행됨으로써, 동일한 압축비를 가진 디젤 사이클보다 높은 효율을 가지게 되어 CO2를 저감시키는 효과가 있으며, 또한 연소속도가 빨라 NOx의 발생을 줄일 수 있어 친환경적이다.As described above, the two-stroke large engine of the present invention injects low-pressure gas into the combustion air before compressing the combustion air, so that the combustion air is mixed with the gas while being pressurized by the rising of the piston to undergo a premixed combustion process. do. Therefore, lean burning is possible. As lean combustion and static combustion, which are the characteristics of the Otto Cycle, are progressed, they have higher efficiency than diesel cycles having the same compression ratio, thereby reducing CO 2 and reducing the generation of NOx due to the faster combustion speed. It is environmentally friendly.

또한, 본 발명의 2행정 대형 엔진은 실린더 내부에 저압가스를 공급함에 따라 종래와 같이 고압가스를 공급하기 위한 고가의 가스펌프가 필요하지 않다. 따라서 경제적이라는 장점과 더불어 엔진 보조 장비의 축소와 함께 출력을 향상시킬 수 있다.In addition, the two-stroke large engine of the present invention does not require an expensive gas pump for supplying a high pressure gas, as the low pressure gas is supplied into the cylinder. This, in addition to the economic advantages, reduces the power of the engine auxiliary equipment and improves the power.

또한, 본 발명의 2행정 대형 엔진은 가스로서 천연가스 또는 바이오 가스를 연료로 사용할 수도 있고 가스의 공급이 원활하지 못할 경우에는 순수 액체 오일 연료를 사용할 수 있다.
In addition, the two-stroke large engine of the present invention may use natural gas or biogas as a fuel as a gas, or use pure liquid oil fuel when the gas supply is not smooth.

도 1은 본 발명에 따른 2행정 대형 엔진을 나타낸 개념도이고,
도 2는 도 1에 도시된 엔진의 작동관계를 나타낸 개념도이며,
도 3은 도 1에 도시된 실린더 헤드의 연료분사밸브를 나타낸 단면도이다.1 is a conceptual diagram showing a two-stroke large engine according to the present invention,
2 is a conceptual diagram showing an operation relationship of the engine shown in FIG.
3 is a cross-sectional view illustrating a fuel injection valve of the cylinder head illustrated in FIG. 1.

아래에서는 본 발명에 따른 2행정 대형 엔진의 양호한 실시예를 첨부한 도면을 참조로 하여 상세히 설명한다.Hereinafter, with reference to the accompanying drawings a preferred embodiment of a two-stroke large engine according to the present invention will be described in detail.

도면에서, 도 1은 본 발명에 따른 2행정 대형 엔진을 나타낸 개념도이고, 도 2는 도 1에 도시된 엔진의 작동관계를 나타낸 개념도이며, 도 3은 도 1에 도시된 실린더 헤드의 연료분사밸브를 나타낸 단면도이다.1 is a conceptual diagram showing a two-stroke large engine according to the present invention, Figure 2 is a conceptual diagram showing the operating relationship of the engine shown in Figure 1, Figure 3 is a fuel injection valve of the cylinder head shown in FIG. It is sectional drawing which shows.

도 1 내지 도 3에 도시된 바와 같이, 2행정 대형 엔진(100)은 실린더(110) 라이너의 중간에 저압가스 공급포트(120)가 형성되고, 저압가스 공급포트(120)에는 가스밸브(121)가 장착되어 저압가스라인(123)으로부터 공급된 저압가스가 가스밸브(121)를 통해 실린더(110) 내부로 유입된다.1 to 3, the two-stroke large engine 100 has a low pressure gas supply port 120 formed in the middle of a cylinder 110 liner, and a gas valve 121 in the low pressure gas supply port 120. The low pressure gas supplied from the low pressure gas line 123 is introduced into the cylinder 110 through the gas valve 121.

한편 실린더(110)의 라이너 하단에는 연소공기리시버(133)가 연결된다. 연소공기리시버(133)에는 터보챠저에서 가압된 연소공기가 충전되며 실린더(110) 라이너의 하단에 형성된 소기구(131)를 통해 가압된 연소공기가 실린더(110) 내부에 유입된다.Meanwhile, the combustion air receiver 133 is connected to the lower end of the liner of the cylinder 110. The combustion air receiver 133 is filled with the combustion air pressurized by the turbocharger and the pressurized combustion air is introduced into the cylinder 110 through the small mechanism 131 formed at the lower end of the cylinder 110 liner.

또한, 실린더 헤드(141)에는 점화원인 2~3개의 연료분사밸브(143)가 설치되며, 연료분사밸브(143)는 고압으로 압축된 연소공기에 연료를 고압으로 분사하여 착화시킨다. 그리고 실린더 헤드(141)에는 배기변(151)이 장착된다.In addition, the cylinder head 141 is provided with two to three fuel injection valves 143 as ignition sources, and the fuel injection valve 143 ignites the fuel by injecting the fuel at high pressure into the combustion air compressed at high pressure. The exhaust valve 151 is mounted to the cylinder head 141.

아래에서는 이와 같이 구성된 2행정 대형 엔진의 작동관계에 대해 설명한다.The following describes the operation relationship of the two-stroke large engine configured in this way.

도 1 및 도 2에 도시된 바와 같이, 실린더(110) 내부를 왕복운동하는 피스톤(161)이 하사점에 위치할 때에 소기구(131)는 개방되며, 개방된 소기구(131)를 통해 연소공기리시버(133)에 충전된 가압된 연소공기가 실린더(110) 내부로 유입된다. As shown in FIGS. 1 and 2, when the piston 161 reciprocating inside the cylinder 110 is located at the bottom dead center, the small balloon 131 is opened, and combustion is performed through the opened small balloon 131. Pressurized combustion air filled in the air receiver 133 is introduced into the cylinder 110.

이 상태에서 피스톤(161)이 상승하는데, 피스톤(161)이 상승하여 소기구(131)를 폐쇄하기 이전까지 가압된 연소공기가 실린더(110) 내부로 유입된다. 이와 같이 실린더(110)에 유입된 연소공기는 실린더(110) 내의 배기가스를 열린 배기변(151)으로 배기시키고, 배기변(151)이 닫힌 후에는 실린더(110) 내부에서 압축되어 연료의 점화에 필요한 온도 및 압력 조건을 형성하게 된다.In this state, the piston 161 is raised, and pressurized combustion air is introduced into the cylinder 110 until the piston 161 is raised to close the small mechanism 131. As such, the combustion air introduced into the cylinder 110 exhausts the exhaust gas in the cylinder 110 to the open exhaust side 151. After the exhaust side 151 is closed, the combustion air is compressed inside the cylinder 110 to ignite the fuel. To form the temperature and pressure conditions required.

한편, 피스톤(161)이 상승하면서 소기구(131)를 폐쇄하고, 이때 저압가스 공급포트(120)를 통해 약 30bar 이하의 가스가 실린더(110)로 유입된다. 저압가스 공급포트(120)에는 가스밸브(121)가 장착되어 실린더(110)로 유입되며 가스밸브(121)에 의해 차단되어 역류하지 않는다.On the other hand, as the piston 161 is raised to close the small mechanism 131, at this time gas of about 30 bar or less is introduced into the cylinder 110 through the low pressure gas supply port 120. The low pressure gas supply port 120 is equipped with a gas valve 121 is introduced into the cylinder 110 and is blocked by the gas valve 121 does not flow back.

이와 같이 실린더(110)로 유입된 저압가스는 전에 유입된 연소공기와 혼합되며 피스톤(161)이 상사점으로 상승하면서 고압으로 압축된다. 가스와 연소공기가 혼합되어 고압을 압축된 상태에서 연료분사밸브(143)에서 가스 점화에 필요한 소량의 오일을 분사하면 고압의 가스가 점화되어 폭발하게 된다.
As such, the low pressure gas introduced into the cylinder 110 is mixed with the combustion air introduced before, and the piston 161 is compressed to high pressure while rising to the top dead center. When a small amount of oil required for gas ignition is injected from the fuel injection valve 143 in a state in which gas and combustion air are compressed at high pressure, gas of high pressure is ignited and exploded.

100 : 2행정 대형 엔진
110 : 실린더
120 : 저압가스 공급포트
121 : 가스밸브
123 : 저압가스라인
131 : 소기구
133 : 연소공기리시버
141 : 실린더 헤드
143 : 연료분사밸브
151 : 배기변
161 : 피스톤100: two-stroke large engine
110: cylinder
120: low pressure gas supply port
121: gas valve
123: low pressure gas line
131: props
133: combustion air receiver
141: cylinder head
143: fuel injection valve
151: exhaust valve
161: piston

Claims (2)

실린더 라이너의 하단에 소기구가 형성되며, 상기 실린더 라이너의 상단에는 배기변이 장착되며, 실린더 헤드에는 점화원이 장착된 2행정 대형 엔진으로서,
상기 실린더 라이너의 중간에 형성된 저압가스 공급포트와,
상기 저압가스 공급포트에 연결된 저압가스라인과,
상기 저압가스 공급포트에 장착된 가스밸브를 포함하는 것을 특징으로 하는 2행정 대형 엔진.
A small stroke is formed in the lower end of the cylinder liner, the exhaust valve is mounted on the upper end of the cylinder liner, the cylinder head is a two-stroke large engine equipped with an ignition source,
A low pressure gas supply port formed in the middle of the cylinder liner;
A low pressure gas line connected to the low pressure gas supply port;
And a gas valve mounted to the low pressure gas supply port.
제1항에 있어서,
상기 실린더를 왕복운동하는 피스톤이 하사점에 위치할 때에 상기 소기구를 통해 연소공기가 유입되어 소기과정을 거치고, 상기 피스톤이 소기구를 폐쇄하였을 때에 상기 저압가스 공급포트를 통해 저압가스가 상기 실린더 내부로 유입되어 상기 피스톤에 의해 압착되는 것을 특징으로 하는 2행정 대형 엔진.The method of claim 1,
When the piston reciprocating the cylinder is located at the bottom dead center, combustion air flows through the small mechanism to undergo a scavenging process, and when the piston closes the small cylinder, low pressure gas flows through the low pressure gas supply port. A large two-stroke engine, characterized in that the inside is compressed by the piston.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150089088A (en) * 2012-12-14 2015-08-04 카와사키 주코교 카부시키 카이샤 Gas engine driving system and ship

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150089088A (en) * 2012-12-14 2015-08-04 카와사키 주코교 카부시키 카이샤 Gas engine driving system and ship

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