CN108590842B - Natural gas engine with ethanol on-line reforming and auxiliary combustion - Google Patents
Natural gas engine with ethanol on-line reforming and auxiliary combustion Download PDFInfo
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- CN108590842B CN108590842B CN201810629856.3A CN201810629856A CN108590842B CN 108590842 B CN108590842 B CN 108590842B CN 201810629856 A CN201810629856 A CN 201810629856A CN 108590842 B CN108590842 B CN 108590842B
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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
- F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
- F02B43/10—Engines or plants characterised by use of other specific gases, e.g. acetylene, oxyhydrogen
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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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
- F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
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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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0227—Means to treat or clean gaseous fuels or fuel systems, e.g. removal of tar, cracking, reforming or enriching
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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
- F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
- F02B43/10—Engines or plants characterised by use of other specific gases, e.g. acetylene, oxyhydrogen
- F02B2043/103—Natural gas, e.g. methane or LNG used as a fuel
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- 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)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
The invention aims to provide a natural gas engine for ethanol online reforming auxiliary combustion, which comprises a working cylinder, a reforming cylinder, a natural gas storage tank, an ethanol storage tank and a mixer, wherein the inlet of the working cylinder is communicated with an air inlet main pipe, the outlet of the working cylinder is communicated with an exhaust main pipe, the air inlet main pipe is communicated with the mixer, the exhaust main pipe is respectively communicated with a heat exchanger and a turbine inlet of a turbocharger, the outlet of a compressor of the turbocharger is communicated with the mixer, the outlet of the natural gas storage tank is communicated with the heat exchanger, two outlets of the heat exchanger are respectively communicated with the mixer and the atmosphere, the inlet of the reforming cylinder is communicated with the ethanol storage tank, the outlet of the reforming cylinder is communicated with a buffer gas tank with a function of collecting and storing hydrogen-. The invention can avoid the trouble of independently preparing, storing and transporting hydrogen, and the hydrogen-doped combustion can effectively exert the advantage of lean combustion, inhibit detonation, prevent fire phenomena and ensure efficient and clean combustion of an ignition type natural gas engine.
Description
Technical Field
The invention relates to an internal combustion engine, in particular to a natural gas engine.
Background
Natural gas is widely used in the engine industry because of its high heat generation, clean emission, abundant reserves and other characteristics. For a spark ignition natural gas engine, if operated in a near equivalence ratio mode, the remote mixture tends to auto-ignite before the flame reaches, thereby initiating detonation. This phenomenon is generally suppressed by lean burn (Φ a > 1). However, when the mixture is lean, the combustion speed is slow, resulting in low thermal efficiency of the natural gas engine and a sharp increase in Hydrocarbon (HC) emissions. In extreme cases, even flame quenching or partial duty cycle misfiring may occur.
In order to solve the above problems, some researchers have proposed that a proper amount of hydrogen is doped into natural gas, and the combustion process of the mixed gas in the lean burn mode is accelerated by utilizing the characteristic of high combustion speed of hydrogen, so that efficient and clean combustion is realized while knocking is suppressed. But the pure hydrogen content in nature is extremely low, and the pure hydrogen is obtained by consuming other energy sources through a certain method.
Bioethanol, as a renewable energy source, can be obtained by fermentation of grains, degradation of biomass, and the like. And the carbohydrate composed by itself is generated by fixing free carbon in the atmosphere, and the combustion or reforming does not bring extra burden to the atmospheric environment. After a certain catalytic reaction, ethanol can be reformed into a mixed gas rich in hydrogen, carbon monoxide and the like, and the mixed gas is used for assisting the combustion of a natural gas engine. However, the structure and the control process of the single ethanol reforming hydrogen production device are complex, and the storage and the transportation of the hydrogen are difficult, so that the overall cost is increased.
Disclosure of Invention
The invention aims to provide a natural gas engine for ethanol on-line reforming auxiliary combustion, which can accelerate the combustion process of lean mixed natural gas, avoid the phenomena of knocking and fire and realize efficient clean combustion.
The purpose of the invention is realized as follows:
an ethanol on-line reforming auxiliary combustion natural gas engine is characterized in that: including working cylinder, reforming cylinder, the natural gas holding vessel, the ethanol storage jar, turbo charger, the blender, working cylinder's import intercommunication inlet manifold, working cylinder's export intercommunication exhaust manifold, inlet manifold intercommunication blender, the exhaust manifold communicates heat exchanger and turbo charger's turbine import respectively, turbo charger's compressor export intercommunication blender, the export intercommunication heat exchanger of natural gas holding vessel, two exports of heat exchanger communicate blender and atmosphere respectively, reforming cylinder's import intercommunication ethanol storage jar, reforming cylinder's export intercommunication possesses the buffer gas jar of collecting and storing rich hydrogen reforming gas function, buffer gas jar intercommunication blender.
The present invention may further comprise:
1. an ethanol injection valve is arranged at the top of a cylinder cover of the reforming cylinder, and a CuO/ZnO/Al2O3 catalytic module with a sponge load structure is arranged on a piston of the reforming cylinder.
2. A throttle valve is arranged at the inlet of a gas compressor of the turbocharger, a natural gas flow valve is arranged between the heat exchanger and the mixer, a reformed gas flow valve is arranged between the buffer gas tank and the mixer, and an ethanol flow valve is arranged between the ethanol storage tank and the inlet of the reformed gas cylinder.
3. The air-fuel equivalence ratio in the working cylinder is larger than 1 under the combined action of the throttle valve and the natural gas flow valve; and under cold start or low load, introducing the hydrogen-rich mixed gas stored in the buffer gas tank into the mixer through the reformed gas flow valve.
The invention has the advantages that:
1. natural gas is used as a main fuel, and hydrogen-rich mixed gas is generated by reforming ethanol to accelerate combustion, so that the knocking and fire catching phenomena of a spark ignition type natural gas engine can be effectively inhibited, and efficient and clean combustion is realized;
2. ethanol reacts in the reforming cylinder, the conversion efficiency is higher under the high-temperature environment, and the hydrogen content in the mixed gas can be effectively improved;
3. the CuO/ZnO/Al2O3 catalyst is adopted instead of a noble metal catalyst, so that the cost is reduced;
4. the buffer gas tank is arranged to store reformed gas, so that the natural gas can be efficiently combusted under the working condition of cold start or low load, and the normal operation of the engine is ensured.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The invention will now be described in more detail by way of example with reference to the accompanying drawings in which:
referring to fig. 1, the natural gas engine for ethanol online reforming and auxiliary combustion comprises a turbocharger 5, an intercooler 6, a mixer 7, a heat exchanger 2, a buffer gas tank 13, a working cylinder 10, a reforming cylinder 11, a CuO/ZnO/Al2O3 catalytic module 12 and the like. The cylinder group is divided into a working cylinder 10 and a reforming cylinder 11, the air-fuel equivalence ratio in the working cylinder 10 is controlled to be larger than 1 through the cooperation of the throttle valve 4 and the natural gas flow valve 3, and lean combustion is guaranteed. The cylinder cover of the working cylinder 10 is provided with a spark plug, the cylinder cover of the reforming cylinder 11 is provided with an ethanol injection valve, and the piston of the reforming cylinder 11 is provided with a CuO/ZnO/Al2O3 catalytic module 12 with a sponge loading structure (the thickness of the module is smaller than the clearance of the upper dead center, so as to avoid collision). The intake valve of the working cylinder 10 is connected to the mixer 7 through an intake pipe, and the injection valve of the ethanol reforming cylinder 11 is connected to the ethanol storage tank 14 through a supply line. The natural gas, air and hydrogen-rich reformed gas are sufficiently mixed in the mixer 7, and then enter the working cylinder 10 through the intake pipe and the intake valve. The heat source of the heat exchanger 2 is provided by the combustion waste gas discharged by the working cylinder, and the liquefied natural gas is converted into the gaseous natural gas through heat exchange. The buffer gas tank 13 is provided with a collecting and storing function. When the engine is in a cold start or a low load state, the reforming cylinder 11 cannot generate enough reformed gas, and the buffer tank 13 can provide a hydrogen-rich mixture to assist combustion in this condition. In the figure, reference numeral 8 denotes an intake pipe, and 9 denotes an exhaust pipe.
A spark plug is arranged on a cylinder cover of the working cylinder 10, an ethanol injection valve is arranged on a cylinder cover of the ethanol reforming cylinder 11, and a CuO/ZnO/Al2O3 catalytic module 12 is arranged on the piston; the exhaust valve of the working cylinder 10 is connected with the turbine and the heat exchanger 2 through pipelines to provide energy for air pressurization and natural gas vaporization. The reforming cylinder 11 has no combustion phenomenon, and the hydrous ethanol generates hydrogen-rich mixed gas consisting of hydrogen, carbon monoxide, methane and the like under the high-temperature condition and the action of a catalyst. A buffer gas tank 13 and a flow valve 15 are arranged in a loop of the ethanol reformed gas to the mixer 7, and the buffer gas tank 13 has the function of collecting and storing the hydrogen-rich reformed gas.
As shown in fig. 1, air enters a turbocharger device 5 through a throttle valve 4, is cooled through an intercooler 6, and then enters a mixer 7. The liquefied natural gas is supplied by a natural gas storage tank 1, is converted into gaseous natural gas through a vaporizer 2, is controlled in flow through a natural gas flow valve 3, enters a mixer 7, is uniformly mixed with air and reformed gas, and then enters a working cylinder. The air-fuel equivalence ratio of the mixture entering the working cylinder 10 is controlled to be larger than 1 through the throttle valve 4 and the natural gas flow valve 3, and lean combustion is guaranteed. The waste gas generated by combustion of the working cylinder is partially led to a turbocharging device 5 to provide energy for the supercharger, and partially led to the vaporizer 2 to provide heat for phase transformation of natural gas.
An ignition device is not arranged in the ethanol reforming cylinder 11, an ethanol injection valve is arranged at the top of a cylinder cover, and a CuO/ZnO/Al2O3 catalytic module with a sponge load structure is arranged on a piston. The ethanol generates a mixed gas of hydrogen, carbon monoxide and the like under the action of high-temperature environment and strong turbulence in the cylinder. The exhaust valve of the reforming cylinder 11 is connected to a buffer gas tank 13 having a capacity of collecting and storing the mixture gas through an exhaust pipe. A reformed gas flow valve 16 is provided between the buffer tank 11 and the mixer 7, and the flow rate of the reformed gas is adjusted in accordance with the engine load. When the engine is in cold start, the reaction in the ethanol reforming cylinder is insufficient, and the stored hydrogen-rich mixed gas can be introduced into the mixer 7, so that the natural gas can be efficiently combusted under the conditions of cold start and low load.
Claims (1)
1. An ethanol on-line reforming auxiliary combustion natural gas engine is characterized in that: the device comprises a working cylinder, a reforming cylinder, a natural gas storage tank, an ethanol storage tank, a turbocharger and a mixer, wherein an inlet of the working cylinder is communicated with an air inlet main pipe, an outlet of the working cylinder is communicated with an air outlet main pipe, the air inlet main pipe is communicated with the mixer, the air outlet main pipe is respectively communicated with a heat exchanger and a turbine inlet of the turbocharger, an outlet of a compressor of the turbocharger is communicated with the mixer, an outlet of the natural gas storage tank is communicated with the heat exchanger, two outlets of the heat exchanger are respectively communicated with the mixer and the atmosphere, an inlet of the reforming cylinder is communicated with the ethanol storage tank, an outlet of the reforming cylinder is communicated with a buffer gas tank with a hydrogen-;
an ethanol injection valve is arranged at the top of a cylinder cover of the reforming cylinder, and a CuO/ZnO/Al2O3 catalytic module with a sponge load structure is arranged on a piston of the reforming cylinder; only ethanol is injected into the reforming cylinder;
a throttle valve is arranged at the inlet of a gas compressor of the turbocharger, a natural gas flow valve is arranged between a heat exchanger and a mixer, a reformed gas flow valve is arranged between a buffer gas tank and the mixer, and an ethanol flow valve is arranged between an ethanol storage tank and the inlet of a reformed cylinder;
the air-fuel equivalence ratio in the working cylinder is larger than 1 under the combined action of the throttle valve and the natural gas flow valve; under cold start or low load, introducing the hydrogen-rich mixed gas stored in the buffer gas tank into the mixer through the reformate flow valve;
the spark plug is arranged on a cylinder cover of the working cylinder, an exhaust valve of the working cylinder is connected with the turbine and the heat exchanger through pipelines to provide energy for air pressurization and natural gas vaporization, no combustion phenomenon exists in the reforming cylinder, and the hydrous ethanol generates hydrogen-rich mixed gas consisting of hydrogen, carbon monoxide, methane and the like under the high-temperature condition and the action of a catalyst.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810629856.3A CN108590842B (en) | 2018-06-19 | 2018-06-19 | Natural gas engine with ethanol on-line reforming and auxiliary combustion |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810629856.3A CN108590842B (en) | 2018-06-19 | 2018-06-19 | Natural gas engine with ethanol on-line reforming and auxiliary combustion |
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| Publication Number | Publication Date |
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| CN108590842A CN108590842A (en) | 2018-09-28 |
| CN108590842B true CN108590842B (en) | 2021-04-09 |
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| CN201810629856.3A Active CN108590842B (en) | 2018-06-19 | 2018-06-19 | Natural gas engine with ethanol on-line reforming and auxiliary combustion |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110318890B (en) * | 2019-07-02 | 2023-07-25 | 哈尔滨工程大学 | Acceleration and deceleration control system and control method for natural gas engine with multi-way valve |
| CN110360026B (en) * | 2019-07-02 | 2021-03-30 | 哈尔滨工程大学 | Ethanol reforming system for improving dynamic performance of natural gas engine and control method |
Citations (7)
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|---|---|---|---|---|
| CN1755089A (en) * | 2004-10-01 | 2006-04-05 | 通用电气公司 | System and method for reducing emission from a internal combustion engine |
| CN102213145A (en) * | 2010-04-08 | 2011-10-12 | 福特环球技术公司 | Selectively storing reformate |
| CN102482976A (en) * | 2009-06-29 | 2012-05-30 | 孟山都技术公司 | Reformed ethanol engines |
| CN103437870A (en) * | 2013-07-24 | 2013-12-11 | 中国科学院工程热物理研究所 | System and method for comprehensively utilizing residual heat of compressed natural gas engine (CNGE) |
| CN104100374A (en) * | 2013-04-11 | 2014-10-15 | 冯崇谦 | Flameless combustion cleaning type internal combustion engine |
| CN106068370A (en) * | 2013-09-20 | 2016-11-02 | 伊恩·罗森 | Explosive motor |
| CN208294639U (en) * | 2018-06-19 | 2018-12-28 | 哈尔滨工程大学 | A kind of ethyl alcohol reforms the natural gas engine of auxiliary combustion online |
-
2018
- 2018-06-19 CN CN201810629856.3A patent/CN108590842B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1755089A (en) * | 2004-10-01 | 2006-04-05 | 通用电气公司 | System and method for reducing emission from a internal combustion engine |
| CN102482976A (en) * | 2009-06-29 | 2012-05-30 | 孟山都技术公司 | Reformed ethanol engines |
| CN102213145A (en) * | 2010-04-08 | 2011-10-12 | 福特环球技术公司 | Selectively storing reformate |
| CN104100374A (en) * | 2013-04-11 | 2014-10-15 | 冯崇谦 | Flameless combustion cleaning type internal combustion engine |
| CN103437870A (en) * | 2013-07-24 | 2013-12-11 | 中国科学院工程热物理研究所 | System and method for comprehensively utilizing residual heat of compressed natural gas engine (CNGE) |
| CN106068370A (en) * | 2013-09-20 | 2016-11-02 | 伊恩·罗森 | Explosive motor |
| CN208294639U (en) * | 2018-06-19 | 2018-12-28 | 哈尔滨工程大学 | A kind of ethyl alcohol reforms the natural gas engine of auxiliary combustion online |
Non-Patent Citations (1)
| Title |
|---|
| Effects of ethanol enrichment on in-cylinder thermochemical fuel reforming(TFR) spark ignition natural gas engine;Zhuoyao He,Lei Zhu,et al;《FUEL》;20170630(第197期);第334～342页 * |
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