CN107842449B - Engine external reforming device with controllable cooling temperature device - Google Patents

Engine external reforming device with controllable cooling temperature device Download PDF

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CN107842449B
CN107842449B CN201711340514.1A CN201711340514A CN107842449B CN 107842449 B CN107842449 B CN 107842449B CN 201711340514 A CN201711340514 A CN 201711340514A CN 107842449 B CN107842449 B CN 107842449B
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temperature
fuel
reformer
reforming
engine
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CN107842449A (en
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郑尊清
贺子晗
尧命发
王洋
南薏媛
杨�嘉
马俊生
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Tianjin University
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Tianjin University
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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
    • F02M33/00—Other apparatus for treating combustion-air, fuel or fuel-air mixture
    • 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
    • F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
    • F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
    • F02M31/12—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating electrically
    • F02M31/125—Fuel
    • 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
    • F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
    • F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
    • F02M31/12—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating electrically
    • F02M31/135—Fuel-air mixture
    • 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
    • F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
    • F02M31/20—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for cooling
    • 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
    • F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
    • F02M31/20—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for cooling
    • F02M31/205—Control

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Hydrogen, Water And Hydrids (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The invention discloses an external reforming device of an engine with a controllable cooling temperature device, which comprises an external reformer with a controllable cooling temperature device; the inlet of the external low-temperature fuel reformer is connected with an air inlet pipe and a fuel sampling pipe; the air inlet pipe is connected with a gas compressor and a flowmeter, and the fuel injection pipe is connected with a fuel injection pump and a fuel vaporization tank; the outlet of the external low-temperature fuel reformer is connected with an engine air inlet pipe; the initial reforming fuel and the fresh air are respectively controlled by a fuel injection pump and an air compressor and led into the external low-temperature reformer, and the reformed gas obtained after the reforming reaction in the reformer is led out from the outlet of the reformer and passes through a controllable cooling temperature device. And adjusting the controllable cooling temperature device to control the cooling temperature to fall, then introducing the required gaseous low-temperature oxidation products with different activities into an air inlet pipe of the engine, mixing the gaseous low-temperature oxidation products with different activities with fresh air, and introducing the gaseous low-temperature oxidation products into the engine together, so that the activity and concentration layered synergistic control combustion of the mixed gas is realized.

Description

Engine external reforming device with controllable cooling temperature device
Technical Field
The invention relates to an external reforming device of an engine, in particular to an external reforming device of an engine with a device capable of controlling cooling temperature.
Background
With the continuous shortage of human social energy and the increasing deterioration of the environment, governments in various countries have made regulations to increase the limits on energy consumption and emission of automobiles. In order to deal with increasingly strict laws and regulations, students at home and abroad are disputedA series of novel combustion modes, such as Homogeneous Charge Compression Ignition (HCCI), Partial Premix Combustion (PPC) and the like, are provided, and all of the combustion modes improve the performance of the engine to different degrees. Among them, fuel reforming, a new combustion technology, has attracted the attention of scholars because it can improve both combustion and emissions of engines. Peucheret et al simulated the reforming process using a simplified thermodynamic equilibrium model, and simultaneously performed an HCCI engine system test based on open fuel exhaust gas reforming, proving the feasibility of the engine to achieve exhaust gas reforming; yao mission et al, at tianjin university, proposed a flexible cylinder combustion mode, i.e., the reformate from the reforming cylinder was introduced into the first few cylinders, thereby improving the combustion and emission characteristics of the engine; tsolakis et al at Bimingham university self-manufactured an engine external reformer to reform fuel into H2And CO, which is introduced into the engine intake to be mixed with air, to increase the available energy of fuel and accelerate the combustion speed of fuel to improve the thermal efficiency of the engine.
However, researches show that different cooling modes of the reformed gas have great influence on the activity of the low-temperature oxidation mixed gas. The difference of the cooling modes is due to the difference of the temperature change history, such as heat preservation cooling, natural cooling, linear cooling and the like, and fig. 1 is an image diagram of the different cooling temperature modes, and shows different cooling temperature curves. Currently, most reformers are less concerned with this problem.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the external reforming device of the engine with the device capable of controlling the cooling temperature, which can avoid blockage of a reforming gas pipe caused by liquefaction of a large amount of reformed gas due to too low natural cooling temperature, reduce the liquefaction of the reformed gas and effectively utilize reformed fuel.
An external low-temperature fuel reforming device of an engine with a controllable cooling temperature device comprises a gas compressor, wherein an outlet of the gas compressor is connected with an inlet of an external low-temperature fuel reformer through an air inlet pipe connected with a flow meter, the flow meter regulates the air flow entering the external low-temperature reformer, an outlet of a fuel injection pump is sequentially connected with a fuel vaporization tank and an inlet of the external low-temperature fuel reformer through a fuel sample inlet pipe, a fuel vaporization tank electric heating wire is wound on the fuel vaporization tank, the fuel vaporization tank electric heating wire is connected with a first temperature control meter, and the fuel injection pump injects reformed fuel into the fuel sample inlet pipe at a constant speed according to a required speed;
the external low-temperature fuel reformer is a cylindrical metal cavity, a reformer electric heating wire is wound on the external low-temperature fuel reformer, the reformer electric heating wire is connected with a second temperature control meter, and the second temperature control meter controls the heating power of the external low-temperature fuel reformer; the outlet of the external low-temperature fuel reformer is communicated with one end of a reforming gas pipe, a controllable cooling temperature device comprises a shell, a plurality of chambers are obtained in the shell through separation of heat insulation materials and serve as temperature control zones, and the other end of the reforming gas pipe penetrates through the heat insulation materials of the controllable temperature cooling device and each temperature control zone along the horizontal direction and is communicated with an engine gas inlet pipe;
a first thermocouple is connected in a reformed gas pipe between the outlet of the external low-temperature fuel reformer and the controllable cooling temperature device to detect the reforming temperature in the external low-temperature fuel reformer, temperature closed-loop feedback is formed between the first thermocouple and a second temperature control meter, a gas pipe electric heating wire is wound on the reformed gas pipe in each temperature control subarea for heat preservation, and a second thermocouple is arranged in a heat insulating material between every two adjacent temperature control subareas for temperature closed-loop feedback; the electric heating wires and the second thermocouples in each temperature control subarea are connected with a multi-path temperature control meter.
Compared with the prior art, the invention has the following advantages:
1. the blockage of a reforming gas pipe caused by liquefaction of a large amount of reforming gas due to the excessively low natural cooling temperature is avoided;
2. the reformed fuel can be effectively utilized by reducing the liquefaction of the reformed gas, thereby being beneficial to the economy;
3. and controlling the secondary reaction of the reformed gas in the cooling process through the required heat preservation cooling to finally obtain the required oxidation product.
Drawings
FIG. 1 is a graphical illustration of different cooling temperature patterns;
FIG. 2 is a schematic diagram of the external low temperature fuel reformer of the engine having a controlled cooling temperature device according to the present invention;
fig. 3 is a schematic diagram of a controllable cooling temperature device in the device shown in fig. 2.
Detailed Description
The technical solutions of the present invention are further described below with reference to the accompanying drawings and specific embodiments, which are only illustrative and not intended to limit the present invention.
The invention influences the subsequent oxidation process of the low-temperature product by controlling the cooling temperature curve after fuel reforming.
The invention mainly cools the reformed product reformed in the external low-temperature fuel reformer 8 at different speeds, then leads the finally obtained reformed gas into the air inlet pipe 14 of the engine, and finally leads the reformed gas into the cylinder 15 of the engine to participate in combustion.
As shown in figure 1, the external low-temperature fuel reforming device with the device capable of controlling the cooling temperature of the engine comprises a compressor 1, wherein an outlet of the compressor 1 is connected with an inlet of an external low-temperature fuel reformer 8 through an air inlet pipe 2 connected with a flow meter 3, and the flow meter 3 regulates the air flow entering the external low-temperature reformer 8. An outlet of a fuel injection pump 4 is sequentially connected with an inlet of a fuel vaporization tank 6 and an inlet of an external low-temperature fuel reformer 8 through a fuel sampling pipe 5, the fuel vaporization tank 6 is wound with an electric heating wire of the fuel vaporization tank, and the electric heating wire of the fuel vaporization tank is connected with a first temperature control meter 7. The fuel injection pump 4 injects reformed fuel into the fuel introduction pipe 5 at a uniform speed at a desired rate.
The external low-temperature fuel reformer 8 is a cylindrical metal cavity, a reformer electric heating wire 9 is wound on the external low-temperature fuel reformer 8, the reformer electric heating wire 9 is connected with a second temperature control meter 10, and the second temperature control meter 10 controls the heating power of the external low-temperature fuel reformer 8 so as to control the reforming temperature of the external low-temperature fuel reformer 8; the outlet of the external low-temperature fuel reformer 8 is communicated with one end of a reforming gas pipe 19, a controllable cooling temperature device 12 comprises a shell, a plurality of chambers (ten are provided as an example in the figure) are separated in the shell by a heat insulating material 18 and are used as temperature control subareas 17, and each temperature control subarea 17 is separated by the heat insulating material 18 so as to ensure that the temperature control subareas are not interfered with each other. The other end of the reforming gas pipe 19 penetrates through the heat insulating material 18 of the temperature-controllable cooling device 12 and each temperature control subarea 17 along the horizontal direction and then is communicated with an engine gas inlet pipe.
A first thermocouple 11 is connected in a reformed gas pipe 19 between the outlet of the external low-temperature fuel reformer 8 and the controllable cooling temperature device 12 to detect the reforming temperature in the external low-temperature fuel reformer 8 and form temperature closed-loop feedback with the second temperature control meter 10.
An air pipe electric heating wire 20 is wound on the reforming air pipe 19 in each temperature control subarea 17 for heat preservation, and a second thermocouple 21 is arranged in the heat insulating material 18 between every two adjacent temperature control subareas 17 for temperature closed-loop feedback; the electric heating wires 20 and the second thermocouples 21 in each temperature control subarea 17 are connected with a multi-path temperature control meter 13, and heat preservation and cooling can be realized by respectively adjusting the heating power of the electric heating wires 20 in each temperature control subarea 17 to obtain controllable cooling temperature, so that blockage of a reforming gas pipe caused by liquefaction of a large amount of reforming gas due to too low natural cooling temperature is avoided, reforming fuel can be effectively utilized, secondary reaction of the reforming gas in the cooling process is controlled, and finally, a required oxidation product is obtained.
The product in the reforming gas pipe 19 is cooled by the temperature-controllable cooling device 12, then is immediately led into the engine gas inlet pipe 14, is mixed with fresh air and finally is led into the engine cylinder 15; the engine cylinder 15 is connected to an engine intake pipe 14 and an engine exhaust pipe 16.
The working process of the device is as follows:
the initially reformed fuel is introduced into a fuel vaporization tank 6 through a fuel introduction pipe 5 at a constant speed by the fuel injection pump 4, and vaporized into a gaseous fuel. Meanwhile, the compressor 1 introduces fresh air into the air inlet pipe 2 through the regulation and control of the flow meter 3. The gaseous fuel and fresh air are simultaneously introduced into the external low temperature fuel reformer 8. In the external low-temperature fuel reformer 8, fresh air is mixed with the gaseous fuel and low-temperature reformed, and the reformed gaseous oxidation product is led out through a reformed gas pipe 19 and passed through a controllable cooling temperature device 12. The controllable cooling temperature device 12 is adjusted to control the cooling temperature to decrease, a required gaseous oxidation product is introduced into an engine air inlet pipe 14, mixed with fresh air and introduced into an engine cylinder 15, and finally forms a mixed gas with fuel directly injected in the cylinder, so that the activity and concentration of the mixed gas are hierarchically controlled to combust.
The results of the calculations made by the Chemkin simulation software are given as examples below. Reforming n-heptane fuel (a kind of diesel fuel), passing the reformed product obtained after low-temperature reforming in the reformer through a controllable cooling temperature device, and if the cooling temperature is controlled to be not less than 680K, then H in the reformed product2O,CO,H2O2And H2The molar fraction of (b) is sharply increased, and when the cooling temperature is lower than 680K, the increasing tendency of the molar fraction becomes gentle. In contrast, C3KET13, CH2The mole fractions of O, C7KET24 and OH peaked at a cooling temperature of 700K, then dropped as the cooling temperature decreased, and leveled off after the cooling temperature decreased to 680K. Wherein the molar fraction of OH decreases to almost zero when the cooling temperature decreases to 320K. In fact, without the soak cooling, the mole fraction of all free radicals in the reformate gas will eventually drop to near zero. Therefore, if the reformate is cooled by keeping the temperature by using a controllable cooling temperature device, a large amount of high-activity substances (C3KET13, CH) can be obtained finally2O, C7KET24 and OH). Then the high-activity reformed gas is quickly led into an air inlet pipe of the engine, is mixed with fresh air and then is led into an engine cylinder, and then is mixed and combusted with fresh fuel sprayed by a working cylinder to generate controllable fuel oil combustion oxidation reaction, and finally the aim of efficient clean combustion of the activity and concentration layered coordination control of the mixed gas is achieved.
The invention utilizes a set of engine external reforming device with a controllable cooling temperature device, the addition of the controllable cooling temperature device can effectively avoid blockage of a reforming gas pipe caused by liquefaction of a large amount of reforming gas due to too low natural cooling temperature, and reforming fuel can be effectively utilized. In addition, the secondary reaction of the reformed gas in the cooling process can be controlled through the required heat preservation and cooling, and the required oxidation product is finally obtained.
In conclusion, the external reforming device of the engine with the device capable of controlling the cooling temperature can control the cooling temperature of the reformate to decrease, and finally the required gaseous reformed gas is obtained.
Although the present invention has been described in connection with the accompanying drawings, the present invention is not limited to the above-described embodiments, which are illustrative only and not restrictive, and many modifications may be made by those skilled in the art without departing from the spirit of the present invention, within the scope of the present invention.

Claims (1)

1. An external low-temperature fuel reforming device of an engine with a controllable cooling temperature device is characterized in that: the fuel injection pump injects reformed fuel into the fuel inlet pipe at a constant speed according to a required speed;
the external low-temperature fuel reformer is a cylindrical metal cavity, a reformer electric heating wire is wound on the external low-temperature fuel reformer, the reformer electric heating wire is connected with a second temperature control meter, and the second temperature control meter controls the heating power of the external low-temperature fuel reformer; the outlet of the external low-temperature fuel reformer is communicated with one end of a reforming gas pipe, a controllable cooling temperature device comprises a shell, a plurality of chambers are obtained in the shell through separation of heat insulation materials and serve as temperature control zones, and the other end of the reforming gas pipe penetrates through the heat insulation materials of the controllable cooling temperature device and each temperature control zone along the horizontal direction and is communicated with an engine gas inlet pipe;
a first thermocouple is connected on a reformed gas pipe between the outlet of the external low-temperature fuel reformer and the controllable cooling temperature device to detect the reforming temperature in the external low-temperature fuel reformer, temperature closed-loop feedback is formed between the reformed gas pipe and a second temperature control meter, a gas pipe electric heating wire is wound on the reformed gas pipe in each temperature control subarea for heat preservation, and a second thermocouple is arranged in a heat insulating material between two adjacent temperature control subareas for temperature closed-loop feedback; the electric heating wires and the second thermocouples in each temperature control subarea are connected with a multi-path temperature control meter.
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CN111677602B (en) * 2020-05-14 2021-11-02 天津大学 Vehicle-mounted waste gas diesel reformer for preventing thermal oxidation coking problem

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4170200A (en) * 1974-06-14 1979-10-09 Nippondenso Co., Ltd. Internal combustion engine with reformed gas generator
JPH07508332A (en) * 1993-03-26 1995-09-14 インターテクノロジー　ホールディング　リミテッド Method and apparatus for operating an internal combustion engine or combustion device
CN207598384U (en) * 2017-12-14 2018-07-10 天津大学 The external reformer of engine of variable cooling mode

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* Cited by examiner, † Cited by third party
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JP4337786B2 (en) * 2005-08-03 2009-09-30 トヨタ自動車株式会社 Internal combustion engine and start control device for internal combustion engine
EP1972776A2 (en) * 2007-03-19 2008-09-24 Nissan Motor Co., Ltd. Octane number-increasing catalyst, fuel reformer of internal combustion engine, and the internal combustion engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4170200A (en) * 1974-06-14 1979-10-09 Nippondenso Co., Ltd. Internal combustion engine with reformed gas generator
JPH07508332A (en) * 1993-03-26 1995-09-14 インターテクノロジー　ホールディング　リミテッド Method and apparatus for operating an internal combustion engine or combustion device
CN207598384U (en) * 2017-12-14 2018-07-10 天津大学 The external reformer of engine of variable cooling mode

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