CN110542561B - Natural gas engine test system for catalytic reforming of exhaust gas-fuel and regeneration of catalyst and control method - Google Patents
Natural gas engine test system for catalytic reforming of exhaust gas-fuel and regeneration of catalyst and control method Download PDFInfo
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- CN110542561B CN110542561B CN201910809397.1A CN201910809397A CN110542561B CN 110542561 B CN110542561 B CN 110542561B CN 201910809397 A CN201910809397 A CN 201910809397A CN 110542561 B CN110542561 B CN 110542561B
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- 239000003054 catalyst Substances 0.000 title claims abstract description 57
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 238000012360 testing method Methods 0.000 title claims abstract description 31
- 239000000446 fuel Substances 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000001833 catalytic reforming Methods 0.000 title claims abstract description 22
- 239000003345 natural gas Substances 0.000 title claims abstract description 19
- 230000008929 regeneration Effects 0.000 title claims abstract description 11
- 238000011069 regeneration method Methods 0.000 title claims abstract description 11
- 239000002912 waste gas Substances 0.000 claims abstract description 15
- 239000007789 gas Substances 0.000 claims description 58
- 230000001105 regulatory effect Effects 0.000 claims description 52
- 239000012495 reaction gas Substances 0.000 claims description 12
- 238000002407 reforming Methods 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 8
- 239000011261 inert gas Substances 0.000 claims description 8
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 2
- 230000009849 deactivation Effects 0.000 abstract description 5
- 230000003647 oxidation Effects 0.000 abstract description 5
- 238000007254 oxidation reaction Methods 0.000 abstract description 5
- 238000011946 reduction process Methods 0.000 abstract description 5
- 230000002779 inactivation Effects 0.000 abstract description 4
- 238000002474 experimental method Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 7
- 239000001257 hydrogen Substances 0.000 description 7
- 229910052739 hydrogen Inorganic materials 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229910002645 Ni-Rh Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000006057 reforming reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
- F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
-
- 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
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/10—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding acetylene, non-waterborne hydrogen, non-airborne oxygen, or ozone
- F02M25/12—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding acetylene, non-waterborne hydrogen, non-airborne oxygen, or ozone the apparatus having means for generating such gases
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Hydrogen, Water And Hydrids (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a natural gas engine test system for catalytic reforming of waste gas-fuel and regeneration of a catalyst and a control method thereof. Meanwhile, aiming at the problem of catalyst deactivation in the reformer, the catalyst can be reduced on line; in addition, the bench can be used for N after the experiment is finished2And the catalyst is filled into the reformer to form an inert atmosphere to protect the catalyst, so that the problem of catalyst inactivation caused by oxidation of residual waste gas in the reformer in the temperature reduction process is avoided.
Description
Technical Field
The invention relates to the technical field of natural gas engine tests, in particular to a natural gas engine test system for catalytic reforming of exhaust gas-fuel and regeneration of a catalyst and a control method.
Background
The exhaust-fuel reforming technology utilizes the waste heat of high-temperature exhaust gas of an engine to catalyze a small amount of fuel and part of the exhaust gas to generate hydrogen-rich reformed gas through an exhaust-fuel reformer. The reformed gas contains H2、CH4And CO and the like, and can improve the combustion of the engine and reduce the emission of pollutants when being introduced into the engine.
The catalyst used in most exhaust gas fuel reformers today is Ni-Rh/Al2O3And the like, in the actual bench test, after a long-time catalytic reforming test, catalyst sintering, carbon deposition or active sites existOxidation of the spots, etc., resulting in a decrease in the activity of the catalyst. Meanwhile, after the bench test is finished, fuel is not added into the reformer at this time, the catalyst still has high activity in the temperature reduction process, and is easily oxidized by oxygen remained in the waste gas in the reformer, so that the activity of the catalyst is further reduced. In addition, improper operation of the reforming test process, such as an insufficient fuel supply resulting in too low a carbon to oxygen ratio, can also cause catalyst deactivation problems.
When the catalyst activity is reduced too much, the catalyst in the reformer needs to be replaced at this time to continue the test. Since the catalyst is usually installed in a tube bundle inside the reformer, it is not easily removed and replaced; on one hand, the reformer is usually in a high-temperature state when working, the temperature of the catalyst on the surface and in the reactor is very high, and at the moment, the catalyst needs to be taken out after being cooled for a long time, and the catalyst is replaced by a new catalyst, which wastes time and labor; on the other hand, the prepared reforming catalyst is generally expensive, and the cost required for replacing the catalyst is high.
Disclosure of Invention
The invention aims to provide a natural gas engine test system and a control method for exhaust gas-fuel catalytic reforming and catalyst regeneration, which can regenerate a catalyst, recycle the catalyst and shorten the time required by test research aiming at the defects of the technology.
In order to achieve the aim, the natural gas engine test system for catalytic reforming of exhaust gas-fuel and regeneration of catalyst comprises a reformer, an engine, a mixer, an intercooler, a three-way pipe, a gas tank, a flow regulating valve and an H2Tank and N2A tank; the reaction gas inlet of the reformer is connected with an engine exhaust pipe through a first exhaust branch pipe, the waste gas inlet of the reformer is connected with the engine exhaust pipe through a second exhaust branch pipe, the reformer gas outlet of the reformer is connected with the inlet a of a three-way pipe, the outlet b of the three-way pipe is sequentially connected with an intercooler and a mixer in series through a reformed gas bypass pipe, and the mixer is connected with the gas inlet of the engine through an engine gas inlet pipe; the waste gas outlet of the reformer is connected with the atmosphere through an atmosphere pipeline, and the outlet c of the three-way pipe is communicated with the atmosphereThe atmosphere valve is communicated with an atmosphere pipeline; the first exhaust branch pipe is connected with the flow regulating valve group through a mixed gas supply pipe, the gas tank is connected with the flow regulating valve group through a fuel pipeline, and H2Can pass through H2The pipeline is connected with a flow regulating valve group, N2Can pass through N2Pipeline and flow control valves.
Further, a REGR front end valve is arranged on the first exhaust branch pipe.
Furthermore, a REGR rear-end valve is arranged on the reformed gas bypass pipe.
Further, an atmosphere valve is arranged on the atmosphere pipeline.
Further, the gas tank is connected with a first electric control butterfly valve of the flow regulating valve group through a fuel pipeline, and H2Can pass through H2The pipeline is connected with a second electric control butterfly valve of the flow regulating valve group, N2Can pass through N2The pipeline is connected with a third electric control butterfly valve of the flow regulating valve group.
A control method of the natural gas engine test system for catalytic reforming of exhaust gas-fuel and regeneration of the catalyst is also provided.
When the catalytic reforming test of the exhaust gas fuel is carried out, the specific process is as follows:
outputting a voltage signal corresponding to the valve opening degree of 0 degrees to close a REGR rear end valve, and outputting a voltage signal corresponding to the valve opening degree of 90 degrees to open an atmospheric valve; a first electric control butterfly valve of the voltage signal regulating flow regulating valve group, the opening of which is not more than 5 degrees, is output; outputting a voltage signal corresponding to the valve opening degree of 90 degrees to open a REGR rear end valve, and simultaneously outputting a voltage signal corresponding to the valve opening degree of 0 degrees to close an atmospheric valve; outputting a voltage signal corresponding to the opening degree of the valve, adjusting a REGR front end valve and a first electric control butterfly valve of a flow adjusting valve group to change the flow rate of the exhaust gas entering a reforming pipe of the reformer and the flow rate of the natural gas, and obtaining the influence of the space velocity and the carbon-oxygen ratio in the reformer on the performance of the LNG engine;
when the exhaust-fuel catalytic reforming test is finished, the specific process is as follows:
after the LNG engine is closed, outputting a voltage signal corresponding to the opening degree of the valve of 0 degreeNumber ReGR front end valve and REGR back end valve closed; a third electric control butterfly valve of the voltage signal regulating flow regulating valve group corresponding to the output valve opening degree of 15-25 degrees and continuously introducing N into the reaction gas inlet of the reformer2A gas stream; after a period of time, a voltage signal corresponding to the opening degree of the output valve of 0 degree closes a third electric control butterfly valve and an atmospheric valve of the flow regulating valve group, and a closed inert gas atmosphere is formed to avoid the reduction of activity caused by oxidation in the catalyst cooling process.
Further, the specific process of catalyst reduction is as follows:
after starting the LNG engine, the LNG engine is maintained to operate under a normal working condition, and the exhaust temperature is stabilized at 400 ℃; outputting a voltage signal corresponding to the valve opening degree of 0 degrees to close a REGR front end valve and a REGR rear end valve; outputting a voltage signal corresponding to the valve opening degree of 90 degrees to open an atmospheric valve; a second electric control butterfly valve and a third electric control butterfly valve of the voltage signal regulating flow regulating valve group respectively outputting corresponding valve opening degrees of 15-25 degrees and 60-80 degrees, and continuously introducing H into a reaction gas inlet of the reformer2And N2Mixing; after the engine runs for a period of time, the engine is closed, voltage signals with the valve opening degree of 0 degree and 15 degrees to 25 degrees are respectively output to close a second electric control butterfly valve in the flow regulating valve group and regulate a third electric control butterfly valve, and N is continuously introduced into a reaction gas inlet of the reformer2(ii) a After a period of time, outputting a voltage signal corresponding to the valve opening degree of 0 degrees to close a third electric control butterfly valve and an atmospheric valve in the flow regulating valve group to form a closed inert gas atmosphere.
Compared with the prior art, the invention has the following beneficial effects: the invention utilizes partial waste gas afterheat to carry out the hydrogen production reaction by reforming the waste gas, introduces hydrogen-rich gas mixture generated by reforming into the engine, explores the rule of the influence of the working parameters of the reformer on the performance and the emission of the engine, and realizes the matching of the performance of the reformer and the engine. Meanwhile, aiming at the problem of catalyst deactivation in the reformer, the catalyst can be reduced on line; in addition, the bench can be used for N after the experiment is finished2And the catalyst is filled into the reformer to form an inert atmosphere to protect the catalyst, so that the problem of catalyst inactivation caused by oxidation of residual waste gas in the reformer in the temperature reduction process is avoided.
Drawings
FIG. 1 is a block flow diagram of a natural gas engine test system for catalytic reforming of exhaust gas-fuel and regeneration of catalyst in accordance with the present invention;
fig. 2 is a schematic of a reformer interface.
Detailed Description
The natural gas engine test system for catalytic reforming of exhaust gas and fuel and regeneration of catalyst shown in FIG. 1 comprises a reformer 1, an engine 2, a mixer 9, an intercooler 8, a three-way pipe 10, a gas tank 3, a flow regulating valve 4, a controller 22, and H2Tank 11 and N2A tank 12; the reaction gas inlet 1A of the reformer 1 is connected with an engine exhaust pipe 14 through a first exhaust branch pipe 21A, the first exhaust branch pipe 21A is provided with a REGR front-end valve 5, an exhaust gas inlet 1B of the reformer 1 is connected with the engine exhaust pipe 14 through a second exhaust branch pipe 21B, the engine exhaust pipe 14 is connected with an exhaust port of the engine, a reformer gas outlet 1C of the reformer 1 is connected with an inlet a of a three-way pipe 10, an outlet B of the three-way pipe 10 is sequentially connected with an intercooler 8 and a mixer 9 in series through a reformed gas bypass pipe 16 (the reformed gas bypass pipe 16 is provided with a REGR rear-end valve 6, the REGR rear-end valve 6 controls the amount of reformed gas entering an engine air inlet pipe 13), and the mixer 9 is connected with an air inlet of the engine 2 through an engine air inlet pipe 13; the waste gas outlet 1D of the reformer 1 is connected to the atmosphere through an atmosphere line 15; meanwhile, the outlet C of the three-way pipe 10 is communicated with an atmosphere pipeline 15 through an atmosphere valve 7, and the atmosphere valve 7 can change the communication state of the reformed gas outlet 1C of the reformer 1 and the atmosphere; the first exhaust branch pipe 21A is connected with the flow regulating valve group 4 through a mixed gas supply pipe 18, the gas tank 3 is connected with a first electric control butterfly valve of the flow regulating valve group 4 through a fuel pipeline 17, and H2Tank 11 through H2The pipe 19 is connected to the second electrically controlled butterfly valve of the flow-regulating valve group 4, N2Tank 12 passing through N2The pipeline 20 is connected with a third electric control butterfly valve of the flow regulating valve group 4; the controller 22 is provided on the flow rate control valve group 4, and the controller 22 is electrically connected to the flow rate control valve group 4, the REGR front end valve 5, the REGR rear end valve 6, and the atmosphere valve 7, respectively.
In this embodiment, the REGR front end valve 5 and the REGR rear end valve 6 are electrically controlled butterfly valves, and the valve opening is controlled by an external voltage signal; the controller is a programmed logic controller, the controller 22 reads the valve opening output voltage signals of the flow regulating valve 4, the REGR front end valve 5, the REGR rear end valve 6 and the atmosphere valve 7, compares the valve opening output voltage signals with the valve opening signals preset in the controller, and correspondingly increases or decreases the voltage signals to control the valve openings of the flow regulating valve 4, the REGR front end valve 5, the REGR rear end valve 6 and the atmosphere valve 7 so as to achieve the preset valve openings.
The working principle of the natural gas engine test system is as follows:
unburned hydrocarbon-containing exhaust gas generated by the operation of the LNG engine is divided into two paths and enters the reactor inlet 1A and the exhaust gas inlet 1B of the reformer 1 through the first exhaust branch pipe 21A and the second exhaust branch pipe 21B respectively, and the controller controls the flow regulating valve 4 through a voltage signal to provide natural gas and H for the reactor inlet 1A of the reformer 1 respectively2/N2Mixed gas (H)220% by volume) or N2. When the reformer 1 works, the waste gas and the natural gas are mixed and enter the reformer 1 to generate a catalytic reforming reaction to prepare hydrogen-rich reformed gas, and the reformed gas generated by the reformer circularly enters an engine to participate in combustion through the three-way valve 10, the REGR rear end valve 6 and the intercooler 8; in the course of catalyst reduction, H2/N2The mixed gas enters the reformer 1 to reduce the catalyst which is oxidized and deactivated; after completion of the catalytic reforming test, N2Into the reformer 1 to form an inert gas atmosphere.
Therefore, the hydrogen production reaction by reforming the waste gas is carried out by utilizing the waste heat of partial waste gas, and the hydrogen-rich gas mixture generated by reforming is introduced into the engine to explore the rule of the influence of the working parameters of the reformer on the performance and the emission of the engine, so that the performance matching of the reformer and the engine is realized. Meanwhile, aiming at the problem of catalyst deactivation in the reformer, the catalyst can be reduced on line; in addition, the bench can be used for N after the experiment is finished2And the catalyst is filled into the reformer to form an inert atmosphere to protect the catalyst, so that the problem of catalyst inactivation caused by oxidation of residual waste gas in the reformer in the temperature reduction process is avoided.
The control method of the natural gas engine test system for catalytic reforming of exhaust gas-fuel and regeneration of catalyst comprises the following steps: wherein, the valve opening degree of 0 degree corresponds to the full-closed state, and the valve opening degree of 90 degrees corresponds to the full-open state;
when the catalytic reforming test of the exhaust gas fuel is carried out, the specific process is as follows:
the controller 22 outputs a voltage signal corresponding to the valve opening degree of 0 degrees to close the REGR rear end valve 6, and outputs a voltage signal corresponding to the valve opening degree of 90 degrees to open the atmospheric valve 7; the controller 22 outputs a voltage signal corresponding to the valve opening degree of not more than 5 degrees to adjust a first electric control butterfly valve of the flow regulating valve group 4; the controller 22 outputs a voltage signal corresponding to the valve opening degree of 90 degrees to open the REGR rear end valve 6, and outputs a voltage signal corresponding to the valve opening degree of 0 degrees to close the atmospheric valve 7; the controller 22 outputs voltage signals corresponding to valve openings of 0-90 degrees (for example, 0 degree, 10 degree, 20 degree, 30 degree, 40 degree, 45 degree, 50 degree, 60 degree, 70 degree, 80 degree and 90 degree) to adjust the REGR front end valve 5 and the first electric control butterfly valve of the flow adjusting valve group 4 to change the flow rate of the exhaust gas and the flow rate of the natural gas entering the reforming pipe of the reformer, and the influence of the space velocity and the carbon-oxygen ratio in the reformer on the performance of the LNG engine is obtained.
When the exhaust-fuel catalytic reforming test is finished, the specific process is as follows:
after the LNG engine is shut down, the controller 22 outputs a voltage signal corresponding to a valve opening of 0 ° to close the REGR front end valve 5 and the REGR rear end valve 6; the controller 22 outputs a voltage signal corresponding to the valve opening of 15-25 degrees (such as 20 degrees) to adjust a third electric control butterfly valve of the flow regulating valve group 4, and N is continuously introduced into a reaction gas inlet 1A of the reformer2A gas stream; after a period of time (for example, after 10 minutes), the controller 22 outputs a voltage signal corresponding to the valve opening of 0 ° to close the third electrically controlled butterfly valve and the atmospheric valve 7 of the flow regulating valve group 4, so as to form a closed inert gas atmosphere to prevent the catalyst from being oxidized during the temperature reduction process to reduce the activity.
When the working time of the catalyst is too long or the operation is not proper, the catalyst loses activity, and the catalyst needs to be reduced at the moment, and the specific process is as follows:
after starting the LNG engine, the LNG engine is maintained to operate under a normal working condition, and the exhaust temperature is stabilized at 400 ℃; the controller 22 outputs a voltage signal corresponding to the valve opening degree of 0 degrees to close the REGR front end valve 5 and the REGR rear end valve 6; the controller 22 outputs a voltage signal corresponding to the valve opening degree of 90 degrees to open the atmospheric valve 7; the controller 22 outputs valve openings of 15-25 deg. (e.g. 20 deg.) anda second electric control butterfly valve and a third electric control butterfly valve (namely the valve opening of the second electric control butterfly valve is 15-25 degrees, and the valve opening of the third electric control butterfly valve is 60-80 degrees) of the voltage signal regulating flow regulating valve group 4 corresponding to 60-80 degrees (such as 70 degrees), and N is continuously introduced into the reaction gas inlet 1A of the reformer2And H2Mixture (N)2And H2The volume fraction ratio of (a) to (b) is 4: 1); after the engine runs for a period of time (such as 1.5 hours), the engine is closed, the controller respectively outputs voltage signals with the valve opening degree of 0 degree and 15-25 degrees (such as 20 degrees), the second electric control butterfly valve in the flow regulating valve group is closed, the third electric control butterfly valve is regulated, and N is continuously introduced into a reaction gas inlet 1A of the reformer2(ii) a After a period of time (for example, after 10 minutes), the controller 22 outputs a voltage signal corresponding to the valve opening of 0 ° to close the third electrically controlled butterfly valve and the atmospheric valve 7 in the flow rate regulating valve group 4, so as to form a closed inert gas atmosphere. If the test is needed, the test is carried out according to the exhaust-fuel catalytic reforming test method, and if the test is not needed, the LNG engine is shut down.
The REGR front end valve can control the flow of the reforming exhaust gas entering the reformer, and the carbon-oxygen ratio and the airspeed in the reforming reaction process can be flexibly controlled by combining the first electric control butterfly valve in the flow regulating valve bank, so that the H of the reforming gas is controlled2The content and the yield of the reformed gas meet the requirements of the engine on the reformed gas under different working conditions, and the matching of the reformer and the engine is realized;
after the waste gas reformer operates for a long time, the internal catalyst has deactivation phenomenon, the hydrogen production efficiency of catalytic reforming is reduced, and at the moment, the catalyst can be reduced on line. In the running process of the engine, the system closes the REGR front end valve and the REGR rear end valve, opens the atmospheric valve, and adjusts the electric control butterfly valve in the flow regulating valve group to provide H with a certain flow rate for the reformer2/N2Mixed gas (H)220% by volume) under which the deactivated catalyst is reduced, and the test can be continued.
After the reformer performance test is completed, the system closes the REGR front end valve and the REGR rear end valve and opens the atmosphere valve; n for regulating electric control butterfly valve in flow regulating valve group to provide certain flow velocity for reformer2(ii) a Close after a period of timeThe gas valve is used for forming inert gas in the reformer to protect the environment and avoid the oxidation and inactivation of the high-temperature catalyst in the cooling process;
the intercooler can adjust reformed gas bypass pipe exit temperature to still have the water collection function, can carry out the water collection that the refrigerated in-process condensation is appeared to the reformed gas, avoid circulation pipeline ponding to get into the cylinder, influence engine steady operation, ponding can be discharged to the excessive height of water level in the intercooler in addition, the steady operation of maintenance system.
Claims (1)
1. A control method of a natural gas engine test system for catalytic reforming of exhaust gas-fuel and regeneration of catalyst is disclosed, wherein the natural gas engine test system comprises a reformer (1), an engine (2), a mixer (9), an intercooler (8), a three-way pipe (10), a gas tank (3), a flow regulating valve group (4), an H-shaped valve group (4)2Tank (11) and N2A tank (12); a reaction gas inlet (1A) of the reformer (1) is connected with an engine exhaust pipe (14) through a first exhaust branch pipe (21A), an exhaust gas inlet (1B) of the reformer (1) is connected with the engine exhaust pipe through a second exhaust branch pipe (21B), a reformer gas outlet (1C) of the reformer (1) is connected with an inlet a of a three-way pipe (10), an outlet B of the three-way pipe (10) is sequentially connected with an intercooler (8) and a mixer (9) in series through a reformed gas bypass pipe (16), and the mixer (9) is connected with a gas inlet of the engine (2) through an engine gas inlet pipe (13); the waste gas outlet (1D) of the reformer (1) is connected with the atmosphere through an atmosphere pipeline (15), and the outlet c of the three-way pipe (10) is communicated with the atmosphere pipeline (15) through an atmosphere valve (7); the first exhaust branch pipe (21A) is connected with the flow regulating valve group (4) through a mixed gas supply pipe (18), the gas tank (3) is connected with the flow regulating valve group (4) through a fuel pipeline (17), and H2The tank (11) is passed through H2The pipeline (19) is connected with a flow regulating valve group (4), N2The tank (12) is passed through N2The pipeline (20) is connected with the flow regulating valve group (4);
the first exhaust branch pipe (21A) is provided with a REGR front end valve (5), and the reformed gas bypass pipe (16) is provided with a REGR rear end valve (6); the gas tank (3) is connected with a first electric control butterfly valve of the flow regulating valve group (4) through a fuel pipeline (17), and H2The tank (11) is passed through H2The pipeline (19) is connected with a second electric control butterfly valve of the flow regulating valve group (4), N2The tank (12) is passed through N2The pipeline (20) is connected with a third electric control butterfly valve of the flow regulating valve group (4);
the method is characterized in that: when the catalytic reforming test of the exhaust gas fuel is carried out, the specific process is as follows:
outputting a voltage signal corresponding to the valve opening degree of 0 degrees to close a REGR rear end valve (6), and outputting a voltage signal corresponding to the valve opening degree of 90 degrees to open an atmospheric valve (7); a first electric control butterfly valve of a voltage signal regulating flow regulating valve group (4) with the opening of the output valve not larger than 5 degrees; outputting a voltage signal corresponding to the valve opening degree of 90 degrees to open a REGR rear end valve (6), and simultaneously outputting a voltage signal corresponding to the valve opening degree of 0 degrees to close an atmospheric valve (7); outputting a voltage signal corresponding to the opening degree of the valve, adjusting a REGR front end valve (5) and a first electric control butterfly valve of a flow adjusting valve group (4) to change the flow of the waste gas and the flow of the natural gas entering a reforming pipe of the reformer, and acquiring the performance influence of the space velocity and the carbon-oxygen ratio in the reformer on the LNG engine;
when the exhaust-fuel catalytic reforming test is finished, the specific process is as follows:
after the LNG engine is closed, outputting a voltage signal corresponding to the valve opening degree of 0 degrees to close a REGR front end valve (5) and a REGR rear end valve (6); a third electric control butterfly valve of the voltage signal regulating flow regulating valve group (4) corresponding to the output valve opening degree of 15-25 degrees continuously introduces N into a reaction gas inlet (1A) of the reformer2A gas stream; after a period of time, outputting a voltage signal corresponding to the valve opening degree of 0 degrees to close a third electric control butterfly valve and an atmospheric valve (7) of the flow regulating valve group (4) to form a closed inert gas atmosphere so as to avoid the catalyst from being oxidized in the cooling process to reduce the activity;
the specific process of catalyst reduction is as follows:
after the LNG engine is started, the LNG engine is kept in normal working condition operation, and a voltage signal corresponding to the opening degree of the valve of 0 degree is output to close the REGR front end valve (5) and the REGR rear end valve (6); outputting a voltage signal corresponding to the valve opening degree of 90 degrees to open an atmospheric valve (7); a second electric control butterfly valve and a third electric control butterfly valve of the voltage signal regulating flow regulating valve group (4) which respectively output corresponding valve opening degrees of 15-25 degrees and 60-80 degrees,continuously introducing N into the reaction gas inlet (1A) of the reformer2And H2Mixing; after the engine runs for a period of time, the engine is closed, voltage signals with the valve opening degree of 0 degree and 15 degrees to 25 degrees are respectively output to close a second electric control butterfly valve in the flow regulating valve group and regulate a third electric control butterfly valve, and N is continuously introduced into a reaction gas inlet (1A) of the reformer2(ii) a After a period of time, outputting a voltage signal corresponding to the valve opening degree of 0 degrees to close a third electric control butterfly valve and an atmospheric valve (7) in the flow regulating valve group (4) to form a closed inert gas atmosphere.
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