Coke scraping ring, cylinder liner, cylinder, gas engine and gas engine operation method

Abstract

The present invention pertains to a coke scraping ring for a cylinder liner of a cylinder used in a gas engine, for scraping carbonaceous residuals (R) off a top land of a piston, comprising a ring body, a top end, a bottom end, and a combustion-facing side configured to be in direct contact with combustion products during operation. The coke scraping ring further comprises a scraping ring section at the bottom end and a recess ring section, configured to provide a recess in the combustion-facing side. The present invention further pertains to a cylinder liner comprising such scraping ring, to a cylinder comprising such cylinder liner, to a gas engine comprising such cylinder and to a gas engine operation method comprising continuous scraping carbonaceous residuals off a top land of a cylinder piston, comprising the steps of assembling a cylinder piston, a coke scraping ring, a cylinder liner, a cylinder crank case and a cylinder head to obtain a ready-to-operate cylinder, operating the cylinder while scraping excess carbonaceous residuals off the top land of a cylinder piston, and observing no pressure-induced deformation on the cylinder piston.