CN111662747B - Vehicle-mounted waste gas diesel reformer for improving thermal oxidation coking problem - Google Patents
Vehicle-mounted waste gas diesel reformer for improving thermal oxidation coking problem Download PDFInfo
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- CN111662747B CN111662747B CN202010408250.4A CN202010408250A CN111662747B CN 111662747 B CN111662747 B CN 111662747B CN 202010408250 A CN202010408250 A CN 202010408250A CN 111662747 B CN111662747 B CN 111662747B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G70/00—Working-up undefined normally gaseous mixtures obtained by processes covered by groups C10G9/00, C10G11/00, C10G15/00, C10G47/00, C10G51/00
- C10G70/04—Working-up undefined normally gaseous mixtures obtained by processes covered by groups C10G9/00, C10G11/00, C10G15/00, C10G47/00, C10G51/00 by physical processes
- C10G70/06—Working-up undefined normally gaseous mixtures obtained by processes covered by groups C10G9/00, C10G11/00, C10G15/00, C10G47/00, C10G51/00 by physical processes by gas-liquid contact
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- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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Abstract
The invention discloses a vehicle-mounted waste gas diesel reformer for improving the thermal oxidation coking problem, which comprises an engine cylinder, a diesel engine post-treatment device, an exhaust main pipe, a reforming water tank, a reformer, a reforming oil tank and an air return pipe, wherein the exhaust main pipe is wound on the periphery of the reformer; the regeneration of the regenerable modified zeolite molecular sieve is realized by controlling the temperature of the post-treatment exhaust gas flowing through the regenerable modified zeolite molecular sieve; deoxidizing the post-treated waste gas by using a renewable modified zeolite molecular sieve, cooling the waste gas by using a reforming water tank, introducing the waste gas into a reforming oil tank to perform displacement deoxidation on the fuel oil, and generating displacement waste gas in the displacement process; the deoxidized fuel in the reforming oil tank and the water in the reforming water tank react in the reformer to generate reformed gas; the reformed gas and the displaced exhaust gas finally enter the engine cylinder to realize combustion. The fuel oil is deoxidized by utilizing the post-treatment waste gas after the deoxidization, so that the possibility of thermal oxidation coking in the fuel oil reforming process is greatly reduced, and meanwhile, the reformer is continuously supplied with heat by utilizing the waste heat of the waste gas, so that the fuel oil reforming rate is improved.
Description
Technical Field
The invention relates to a vehicle-mounted waste gas diesel oil reformer, in particular to a vehicle-mounted waste gas diesel oil reformer for improving the thermal oxidation coking problem in the fuel oil reforming reaction process.
Background
Coking refers to thermal oxidation coking or thermal cracking coking of fuel oil at high temperature to generate macromolecular carbon deposition particles to further generate coking deposits. For example, if coking occurs in the vehicle-mounted fuel reformer, the coking product adheres to the wall surface of the reformer, so that the thermal resistance of the wall surface is increased, the heat transfer quality is deteriorated, the performance of the reformer is affected, if the coking product falls off, the coking product flows to an engine nozzle along a pipeline, the nozzle is blocked, the performance of an oil injector is reduced, the combustion efficiency is further affected, and if the coking product falls off, the engine may be in fire or knock. The main mechanism of thermal oxidation coking is that under the condition of high temperature, free radicals in fuel oil react with dissolved oxygen in fuel to generate hydroperoxide, and then the hydroperoxide and other small molecular products of thermal oxidation are polymerized into macromolecules, thereby coking. The low-temperature exhaust gas reforming mainly comprises two reactions, namely a partial oxygen reforming reaction of fuel oil and a water reforming reaction of the fuel oil. Because the reforming reaction temperature is high and the reaction environment contains partial oxygen, thermal oxidation coking is easy to occur in the reforming process, and the performance of the reformer is influenced.
It is known that the combustion of a diesel engine is oxygen-rich combustion with a high air-fuel ratio, and therefore the oxygen content in the exhaust gas is as high as about 10%, and in a conventional exhaust gas reforming apparatus, reforming is performed directly using diesel engine exhaust gas that has not been subjected to deoxidation treatment and fuel oil that has not been subjected to deoxidation treatment, and although the oxygen content is high, partial oxygen reforming reaction is promoted to increase the fuel oil reforming rate, the risk of coking is also involved.
Disclosure of Invention
The invention provides a vehicle-mounted waste gas diesel reformer capable of improving the thermal oxidation coking problem, which aims at the prior art and is characterized in that the vehicle-mounted waste gas diesel reformer capable of improving the thermal oxidation coking problem is used for deoxidizing and cooling the post-treatment waste gas, then the cooled deoxidized waste gas is used for replacing fuel oil with dissolved oxygen, finally the deoxidized fuel oil and steam are introduced into the reformer, the reforming reaction is carried out at the temperature of the waste heat of the post-treatment waste gas, and only the water reforming reaction is reserved by removing part of the oxygen reforming reaction in the low-temperature waste gas reforming process, so that the thermal oxidation coking problem which can occur in the. Aiming at the phenomenon that the fuel oil reforming rate is reduced due to the fact that part of oxygen reforming reaction is removed, continuous heat supply is carried out on the reformer by utilizing high-temperature exhaust of the engine, and the degree of progress of the water reforming reaction is promoted to compensate. In a word, after the engine combustion exhaust gas is deoxidized and cooled, the cooled deoxidized exhaust gas is used for replacing dissolved oxygen in fuel oil, and an anaerobic reforming environment is constructed, so that the problem of thermal oxidation and coking in the fuel oil reforming reaction process is solved.
In order to solve the technical problems, the vehicle-mounted exhaust gas diesel reformer for improving the thermal oxidation coking problem comprises an engine cylinder, a diesel engine after-treatment device (DOC + DPF + SCR), an exhaust main pipe, a reforming water tank, a reformer, a reforming oil tank and an air return pipe, wherein the engine cylinder is connected with an air inlet branch pipe and an exhaust branch pipe; a first communicating valve is arranged on the air inlet branch pipe, a second communicating valve is arranged on the exhaust main pipe, and a third communicating valve is arranged at one end of the air return pipe; the diesel engine post-treatment device is provided with two outlets which are respectively marked as an outlet A and an outlet B; the reforming water tank comprises a cooling pipeline and only has one water outlet; the reforming oil tank is provided with two outlets which are respectively marked as an outlet C and an outlet D; the other end of the exhaust branch pipe is connected with an inlet of the diesel engine post-processing device, an outlet A of the diesel engine post-processing device is connected to one end of an exhaust main pipe, the other end of the exhaust main pipe is an air outlet end, the exhaust main pipe is wound around the reformer, the reformer is heated by post-processing exhaust gas flowing through the exhaust main pipe, the heat of the exhaust gas is efficiently utilized, the fuel oil reforming rate is improved, and the second communicating valve is located on a pipe section, close to the outlet A of the diesel engine post-processing device, of the exhaust main pipe; an outlet B of the diesel engine post-treatment device is connected with a renewable modified zeolite molecular sieve; the renewable modified zeolite molecular sieve is provided with two outlets which are respectively marked as an outlet E and an outlet F, the outlet E of the renewable modified zeolite molecular sieve is connected with the inlet of the cooling pipeline of the reforming oil tank after sequentially passing through a gas pump and the cooling pipeline of the reforming water tank, the outlet F of the renewable modified zeolite molecular sieve is connected with one end of a regeneration return pipe, and the other end of the regeneration return pipe is connected to the second communicating valve and then communicated with the exhaust main pipe; the water outlet of the reforming water tank is connected with the water inlet of the reformer after passing through a water injection pump; an outlet C of the reforming oil tank is connected to the third communicating valve and communicated with the air return pipe, so that pollution-free treatment of the replacement waste gas is realized; an outlet D of the reforming oil tank is connected with an oil inlet of the reformer after passing through a fuel injection pump, and an outlet end of the reformer is connected to the third communication valve and then communicated with the air return pipe; the other end of the air return pipe is connected to the first communicating valve and then communicated with the air inlet branch pipe.
Further, in the vehicle-mounted exhaust gas and diesel oil reformer, the first communicating valve, the second communicating valve and the third communicating valve are all three-way valves.
The deoxidized waste gas after the deoxidizing treatment of the renewable modified zeolite molecular sieve is cooled when flowing through a cooling pipeline of the reforming water tank, the cooled deoxidized waste gas is introduced into the reforming oil tank to perform replacement of dissolved oxygen in fuel oil, finally deoxidized fuel oil is generated in the reforming oil tank, and the replaced waste gas containing the dissolved oxygen and a small amount of fuel oil steam generated in the replacement process is introduced into the gas return pipe through a third communicating valve; when the fuel oil is reformed, firstly, the deoxidized fuel oil in the reforming oil tank is introduced into the reformer to be evaporated, and then, the steam is introduced, and the fuel is reformed in the reformer under the heating of the exhaust manifold; the reformed gas sequentially passes through the third communicating valve and the replacement waste gas, enters the air inlet branch pipe through the air return pipe and the first communicating valve, is mixed with fresh air, and finally enters an engine cylinder to realize combustion.
Compared with the prior art, the invention has the beneficial effects that:
in the invention, the deoxidized waste gas can carry out dissolved oxygen replacement on the fuel oil participating in the reforming reaction, so that reactants finally entering the reformer are only steam and the deoxidized fuel oil, the oxygen content in the reformer is greatly reduced, the possibility of thermal oxidation coking in the reformer in the reforming process is greatly reduced, meanwhile, the exhaust main pipe surrounds the periphery of the reformer, the rest of the waste gas which is not deoxidized is used for heating the reformer, a constant reaction temperature is provided for the water reforming reaction, the water reforming reaction is promoted, and the problem of fuel oil reforming rate reduction caused by the fact that part of the oxygen reforming reaction cannot be smoothly carried out due to the fact that the oxygen content in the reformer is greatly reduced is counteracted to a great extent. The multiple utilization of waste gas is realized, and the inconvenience caused by externally loaded replacement gas is also avoided. The regeneration of the zeolite molecular sieve can be realized by adjusting the temperature of the environment where the modified zeolite molecular sieve is located without adding a regeneration device, the regenerated waste gas of the zeolite molecular sieve does not cause harm to the environment, and the replaced waste gas generated after the replacement of fuel oil dissolved oxygen is not discharged into the atmosphere, but is introduced into an engine cylinder together with reformed gas for combustion, so that the atmospheric pollution is avoided, and the efficient utilization of resources is realized.
According to the invention, the fuel oil is deoxidized by post-treatment of the exhaust gas after the deoxidation treatment, and the problem of thermal oxidation and coking easily generated in the reforming reaction process is improved by constructing a low-oxygen reaction environment; by utilizing the high-temperature exhaust gas of the engine, the reforming reaction is promoted. The whole device improves the thermal oxidation coking problem in the reforming reaction process by multiple utilization of the post-treatment waste gas, and has simple structure, convenient arrangement and high resource utilization rate.
Drawings
FIG. 1 is a schematic diagram of an on-board exhaust gas diesel reformer according to the present invention.
In the figure:
1-inlet manifold 2-first communication valve 3-engine cylinder
4-exhaust branch pipe 5-diesel engine post-treatment device 6 second communicating valve
7-exhaust manifold 8-regeneration reflux pipe 9-renewable modified zeolite molecular sieve
10-gas pump 11-reforming water tank 12-water injection pump
13-reformer 14-reforming oil tank 15-fuel injection pump
16 third communicating valve 17-air return pipe
Detailed Description
The invention will be further described with reference to the following figures and specific examples, which are not intended to limit the invention in any way.
As shown in fig. 1, the vehicle-mounted exhaust gas diesel reformer for improving the thermal oxidation coking problem comprises an engine cylinder 3, a diesel post-processing device 5, an exhaust manifold 7, a reforming water tank 11, a reformer 13, a reforming oil tank 14 and an air return pipe 17, wherein the engine cylinder 3 is connected with an air inlet branch pipe 1 and an exhaust branch pipe 4, the air inlet branch pipe 1 is provided with a first communication valve 2, the other end of the exhaust branch pipe 4 is connected with an inlet of the diesel post-processing device 5, the diesel post-processing device 5 is provided with two outlets, which are respectively marked as an outlet a and an outlet B, the outlet a of the diesel post-processing device 5 is connected to one end of the exhaust manifold 7, the other end of the exhaust manifold 7 is an air outlet, the exhaust manifold 7 is wound around the reformer 13, and the reformer 13 is heated by post-processing exhaust gas flowing through the exhaust manifold 7, the high-efficiency utilization of the heat of the exhaust gas is realized, the fuel oil reforming rate is improved, a second communicating valve 6 is arranged on the exhaust main pipe 7, and the second communicating valve 6 is positioned on the pipe section of the exhaust main pipe 7 and close to the outlet A of the diesel engine post-processing device 5; and an outlet B of the diesel engine post-treatment device 5 is connected with a renewable modified zeolite molecular sieve 9.
The renewable modified zeolite molecular sieve 9 is provided with two outlets, namely an outlet E and an outlet F, the reforming water tank 11 internally comprises a cooling pipeline, and the reforming water tank 11 is provided with only one water outlet; an outlet E of the renewable modified zeolite molecular sieve 9 is connected with an inlet of the reforming oil tank 14 after passing through cooling pipelines of the gas pump 10 and the reforming water tank 11 in sequence, an outlet F of the renewable modified zeolite molecular sieve 9 is connected with one end of a regeneration return pipe 8, and the other end of the regeneration return pipe 8 is connected to the second communication valve 6 and then communicated with the exhaust main pipe 7; the deoxidized waste gas is cooled by water in the reforming water tank when flowing through the cooling pipeline, and a water outlet of the reforming water tank 11 is connected with a water inlet of the reformer 13 after passing through a water injection pump 12; the reforming oil tank 14 is provided with two outlets, namely an outlet C and an outlet D, one end of the air return pipe 17 is provided with a third communicating valve 16, the outlet C of the reforming oil tank 14 is connected to the third communicating valve 16 and communicated with the air return pipe 17, and pollution-free treatment of the replacement waste gas is realized; an outlet D of the reforming oil tank 14 is connected with an oil inlet of the reformer 13 after passing through a fuel injection pump 15, and an outlet end of the reformer 13 is connected to the third communication valve 16 and then communicated with the air return pipe 17; the other end of the air return pipe 17 is connected to the first communication valve 2 and then communicated with the air inlet branch pipe 1.
In the present invention, the first communication valve 2, the second communication valve 6, and the third communication valve 16 are three-way valves.
The deoxidized waste gas after being deoxidized by the renewable modified zeolite molecular sieve 9 is cooled when flowing through a cooling pipeline of the reforming water tank 11 under the action of the gas pump 10, the cooled deoxidized waste gas is introduced into the reforming oil tank 14 to perform replacement of dissolved oxygen in fuel oil, finally deoxidized fuel oil is generated in the reforming oil tank 14, and the replaced waste gas containing the dissolved oxygen and a small amount of fuel oil steam generated in the replacement process is introduced into the air return pipe 17 through a third communication valve 16; in the fuel reforming, initially, the deoxygenated fuel in the reforming fuel tank 14 is first introduced into the reformer 13 for evaporation, and then the water in the reforming water tank 11 is introduced into the reformer 13 again, so that the fuel is reformed in the reformer 13 under the heating of the exhaust manifold 7; the reformed gas sequentially passes through the third communicating valve 16 and the first communicating valve 2, enters the air inlet branch pipe 1 together with the replacement waste gas through the air return pipe 17, is mixed with fresh air, and finally enters the engine cylinder 3 to realize combustion.
The working principle of the invention is as follows:
1) the zeolite molecular sieve is a polar molecular sieve, although nitrogen and oxygen are nonpolar substances, the nitrogen and oxygen are influenced by the zeolite molecular sieve to generate induced dipoles, an induction force exists between the induced dipoles and intrinsic dipoles of polar molecules, so that the zeolite molecular sieve has adsorption capacity for both nitrogen and oxygen, and the adsorption capacity for oxygen can be improved by ion exchange modification of the zeolite molecules, so that the deoxidation treatment of the post-treatment waste gas is realized. The zeolite molecules in the regenerable modified zeolite molecular sieve 9 have higher activity at the temperature of 400-700 ℃, can adsorb oxygen molecules, and the post-treatment waste gas flowing through the regenerable modified zeolite molecular sieve 9 is deoxidized into deoxidized waste gas through the adsorption capacity of the zeolite molecules on oxygen. When the adsorption capacity of the zeolite molecular sieve reaches saturation, low-temperature waste gas is introduced inwards, the ambient temperature in the renewable modified zeolite molecular sieve 9 is reduced, the oxygen storage capacity of zeolite molecules is reduced, oxygen molecules adsorbed by the zeolite molecular sieve overflow again, and the introduced low-temperature waste gas is converged into an exhaust manifold 7 through a regeneration return pipe 8 and a second communication valve 6, so that the regeneration of the renewable modified zeolite molecular sieve is completed.
2) The deoxygenated exhaust gas flowing out of the regenerable modified zeolite molecular sieve 9 is cooled by a cooling pipeline of a reforming water tank 11 and then introduced into a reforming oil tank 14 to replace the dissolved oxygen in the fuel oil, the dissolved oxygen in the fuel is replaced by molecules such as nitrogen, carbon dioxide and the like in the exhaust gas according to the Henry law, the fuel oil with the dissolved oxygen content of only about 1ppm is finally generated, and the replaced exhaust gas containing the dissolved oxygen and a small amount of fuel steam generated in the process is introduced into a return pipe 17 through a third communication valve 16.
3) The exhaust manifold 7 surrounds the reformer 13 and continuously provides heat for the reforming reaction, the deoxygenated fuel oil is pumped into the reformer 13 by the fuel oil injection pump 15, the water is pumped into the reformer 13 at high pressure by the water injection pump 12, the deoxygenated fuel oil and the water are subjected to the water reforming reaction in the reformer 13 to generate small molecular products such as hydrogen, carbon monoxide and methane, and the final product reformed gas of the water reforming reaction enters the air return pipe 17 through the third communication valve 16.
The working process of the invention is as follows:
1) the exhaust gas generated by combustion in the engine cylinder 3 is pushed out by the piston and flows into the diesel post-treatment device 5 through the exhaust branch pipe 4, the diesel post-treatment device 5 treats the exhaust gas, a part of the treated exhaust gas flows out through the exhaust manifold 7, and a part of the treated exhaust gas flows to the renewable modified zeolite molecular sieve 9.
2) The post-treatment waste gas introduced into the renewable modified zeolite molecular sieve 9 is deoxidized under the action of zeolite molecules to generate deoxidized waste gas; when the renewable modified zeolite molecular sieve 9 is regenerated, the post-treatment exhaust gas in the diesel engine post-treatment device 5 is cooled and then introduced into the renewable modified zeolite molecular sieve 9, the reduction of the ambient temperature in the renewable modified zeolite molecular sieve 9 causes the reduction of the oxygen adsorption saturation value of the zeolite molecular sieve, the adsorbed oxygen overflows, and the introduced low-temperature post-treatment exhaust gas flows into the exhaust manifold 7 through the regeneration return pipe 8 and the second communication valve 6.
3) The deoxidized gas flows through a cooling pipeline of the reforming water tank 11 to be cooled under the action of the gas pump 10, the deoxidized waste gas cooled by the cooling pipeline of the reforming water tank 11 is then introduced into a reforming oil tank 14 to be subjected to dissolved oxygen replacement, and finally deoxidized fuel oil is obtained, the generated deoxidized fuel oil is pumped into a reformer 13 by a fuel oil injection pump 15 at high pressure, meanwhile, a water injection pump 12 injects cooling water in the reforming water tank 11 into the reformer 13 at high pressure, the deoxidized fuel oil and the cooling water perform a water reforming reaction in the reformer 13 to generate reformed gas, and the generated reformed gas is converged into a gas return pipe 17 through a third communication valve 16; the displaced exhaust gas containing dissolved oxygen and a small amount of fuel vapor generated in the displacement process is introduced into the return pipe 17 through the third communicating valve 16 to be mixed.
4) The exhaust manifold 7 surrounds the reformer 13, and the post-treated exhaust gas flowing through the exhaust manifold 7 provides heat for the water reforming reaction in the reformer 13, promotes the evaporation of deoxygenated fuel oil and water by the high temperature of the exhaust gas while providing a constant reaction temperature for the water reforming reaction, and is finally discharged into the atmosphere.
5) The reformed gas and the replacement exhaust gas entering the return air pipe 17 flow into the intake branch pipe 1 through the first communication valve 2, and are mixed with the fresh air entering the intake branch pipe 1, so that the reformed gas and the replacement exhaust gas flow into the engine cylinder along with the fresh air, and are finally introduced into the engine cylinder 3 for combustion.
In conclusion, the vehicle-mounted waste gas diesel reformer realizes the deoxidation treatment of the post-treatment waste gas through the renewable modified zeolite molecular sieve 9, and can realize the regeneration of the renewable modified zeolite molecular sieve by controlling the temperature of the post-treatment waste gas flowing through the renewable modified zeolite molecular sieve 9; a cooling pipeline in the reforming water tank 11 cools the deoxygenated exhaust gas flowing through; the cooled deoxygenated waste gas is introduced into the reforming oil tank 14 to perform displacement deoxygenation on the fuel oil in the reforming oil tank 14, the reforming oil tank 14 is connected with the air return pipe 17, and the displaced waste gas is introduced into the air return pipe 17; the cooling water in the reforming water tank 11 is pumped into the reformer 13 by the water injection pump 12, and the deoxygenated fuel in the reforming oil tank 14 is pumped into the reformer 13 by the fuel injection pump 15; the deoxidized fuel oil and the steam in the reformer 13 are subjected to water reforming reaction, and the generated reformed gas is introduced into the return pipe 17; the air return pipe 17 is connected with the air inlet branch pipe 1, and the reformed gas, the replacement waste gas and the fresh mixed gas are uniformly mixed and enter the engine cylinder 3 to realize combustion. In the process, the post-treatment waste gas after the deoxidation treatment is used for realizing the deoxidation treatment of the fuel oil participating in the reforming reaction, so that the possibility of thermal oxidation coking in the fuel oil reforming process is greatly reduced, the heat of the waste gas is used for continuously supplying heat to the reformer, and the fuel oil reforming rate is improved.
While the present invention has been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are illustrative only and not restrictive, and various modifications which do not depart from the spirit of the present invention and which are intended to be covered by the claims of the present invention may be made by those skilled in the art.
Claims (3)
1. A vehicle-mounted exhaust gas diesel reformer for improving the thermal oxidation coking problem comprises an engine cylinder (3), a diesel aftertreatment device (5), an exhaust main pipe (7), a reforming water tank (11), a reformer (13), a reforming oil tank (14) and a gas return pipe (17), wherein the engine cylinder (3) is connected with an air inlet branch pipe (1) and an exhaust branch pipe (4); it is characterized in that the preparation method is characterized in that,
a first communicating valve (2) is arranged on the air inlet branch pipe (1), a second communicating valve (6) is arranged on the exhaust main pipe (7), and a third communicating valve (16) is arranged at one end of the air return pipe (17);
the diesel engine post-treatment device (5) is provided with two outlets which are respectively marked as an outlet A and an outlet B;
the reforming water tank (11) internally comprises a cooling pipeline, and the reforming water tank (11) is only provided with one water outlet;
the reforming oil tank (14) is provided with two outlets which are respectively marked as an outlet C and an outlet D;
the other end of the exhaust branch pipe (4) is connected with an inlet of the diesel engine post-processing device (5), an outlet A of the diesel engine post-processing device (5) is connected to one end of an exhaust main pipe (7), the other end of the exhaust main pipe (7) is an air outlet end, the exhaust main pipe (7) is wound around the reformer (13), the reformer (13) is heated by post-processing exhaust gas flowing through the exhaust main pipe (7), efficient utilization of exhaust gas heat is achieved, fuel oil reforming rate is improved, and the second communication valve (6) is located on a pipe section, close to the outlet A of the diesel engine post-processing device (5), of the exhaust main pipe (7); an outlet B of the diesel engine post-treatment device (5) is connected with a renewable modified zeolite molecular sieve (9);
the renewable modified zeolite molecular sieve (9) is provided with two outlets which are respectively marked as an outlet E and an outlet F, the outlet E of the renewable modified zeolite molecular sieve (9) is connected with the inlet of the reforming oil tank (14) after sequentially passing through a gas pump (10) and a cooling pipeline of the reforming water tank (11), the outlet F of the renewable modified zeolite molecular sieve (9) is connected with one end of a regeneration return pipe (8), and the other end of the regeneration return pipe (8) is connected to the second communicating valve (6) and then communicated with the exhaust main pipe (7);
the water outlet of the reforming water tank (11) is connected with the water inlet of the reformer (13) after passing through a water injection pump (12); an outlet C of the reforming oil tank (14) is connected to the third communication valve (16) and communicated with the air return pipe (17), so that pollution-free treatment of the replacement exhaust gas is realized; an outlet D of the reforming oil tank (14) is connected with an oil inlet of the reformer (13) after passing through a fuel injection pump (15), and an outlet end of the reformer (13) is connected to the third communication valve (16) and then communicated with the air return pipe (17); the other end of the air return pipe (17) is connected to the first communicating valve (2) and then communicated with the air inlet branch pipe (1).
2. The vehicle-mounted exhaust gas diesel reformer according to claim 1, characterized in that the first communication valve (2), the second communication valve (6) and the third communication valve (16) are all three-way valves.
3. The on-vehicle exhaust gas diesel reformer according to claim 1 or 2, characterized in that the deoxygenated exhaust gas subjected to deoxygenation treatment by the regenerable modified zeolite molecular sieve (9) is cooled while flowing through a cooling line of the reforming water tank (11), the cooled deoxygenated exhaust gas is introduced into the reforming oil tank (14) to be subjected to replacement of dissolved oxygen in fuel oil, and finally deoxygenated fuel oil is produced in the reforming oil tank (14), and the replaced exhaust gas containing dissolved oxygen and a small amount of fuel vapor produced during replacement is introduced into the return pipe (17) through a third communication valve (16); when the fuel oil is reformed, firstly, the deoxidized fuel oil in the reforming oil tank (14) is firstly introduced into the reformer (13) for evaporation, then the water in the reforming water tank (11) is introduced into the reformer (13), and the reforming of the fuel is realized in the reformer (13) under the heating of the exhaust manifold (7); reformed gas sequentially passes through the third communicating valve (16) and the first communicating valve (2) and is mixed with fresh air in the air inlet branch pipe (1) together with replacement waste gas through the air return pipe (17), and finally enters the engine cylinder (3) to realize combustion.
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| CN202010408250.4A CN111662747B (en) | 2020-05-14 | 2020-05-14 | Vehicle-mounted waste gas diesel reformer for improving thermal oxidation coking problem |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106968845A (en) * | 2017-03-14 | 2017-07-21 | 天津大学 | Added water fuel reforming device without catalyst low temperature using engine exhaust waste heat |
| CN109630245A (en) * | 2018-12-14 | 2019-04-16 | 武汉理工大学 | A kind of lighter hydrocarbons/Reforming Diesel Fuel system and reforming method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106968845A (en) * | 2017-03-14 | 2017-07-21 | 天津大学 | Added water fuel reforming device without catalyst low temperature using engine exhaust waste heat |
| CN109630245A (en) * | 2018-12-14 | 2019-04-16 | 武汉理工大学 | A kind of lighter hydrocarbons/Reforming Diesel Fuel system and reforming method |
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