Exhaust gas-fuel catalytic reforming and catalyst regeneration natural gas engine test system and control method

Abstract

The invention discloses a natural gas engine test system and control method for exhaust gas-fuel catalytic reforming and catalyst regeneration, using part of the waste heat of exhaust gas to carry out the hydrogen production reaction of exhaust gas reforming, and passing the hydrogen-rich mixed gas generated by reforming into the engine for exploration The law of the influence of reformer operating parameters on engine performance and emissions, to achieve the matching of reformer and engine performance. At the same time, in order to solve the problem of catalyst deactivation in the reformer, catalyst reduction can be carried out online; in addition, the bench can remove N 2 It is charged into the reformer to form an inert atmosphere to protect the catalyst and avoid the problem of catalyst deactivation caused by the oxidation of exhaust gas remaining inside the reformer during the cooling process.

Description

technical field [0001] The invention relates to the technical field of natural gas engine testing, in particular to a natural gas engine testing system and control method for exhaust gas-fuel catalytic reforming and catalyst regeneration. Background technique [0002] Exhaust gas-fuel reforming technology uses exhaust gas-fuel reformer to catalyze a small amount of fuel and part of exhaust gas to generate hydrogen-rich reformed gas by using the waste heat of high-temperature exhaust gas from the engine. The reformed gas contains H 2 、CH 4 And CO, etc., passing into the engine can improve engine combustion and reduce pollutant emissions. [0003] At present, the catalyst used in most exhaust gas fuel reformers is Ni-Rh / Al 2 o 3 etc. In the actual bench test, after a long time of catalytic reforming test, there are phenomena such as catalyst sintering, carbon deposition or oxidation of active sites, resulting in a decrease in catalyst activity. At the same time, after the...

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Problems solved by technology

Since the catalyst is usually installed in the tube bundle inside the reformer, it is not easy to remove and replace; on the one hand, the reformer is usually in a high temperature state when it is working, and the temperature of the catalyst on the surface and inside of the reactor is very high. The catalyst can only be taken out after cooling, and it takes time and effort to replace the new catalyst; on the other hand, the prepared reforming catalyst is usually expensive, and the cost of replacing the new catalyst is relatively high at this time

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