限制性环节 meaning in English

critical link

Abstract : during the heating of scrap with carbon or hydrocarbon contented substances in some process , it will bring problems like explosion of carbon monoxide , fume and smell from oil volatilization , etc . ， if incomplete combustion occurs . through laboratory experiments , the time related variation of gas contents and post combustion ratio of fume during the heating of oil - bearing scrap are studied . the results show that the restrictive chain of reaction procedure is the thermolysis of oil ; that temperature and ( co ) / ( co2 ) ratio influence transformation ratio and post - combustion ratio under lower temperature ; that 900 is the temperature above which the complete reaction can be ensured at all ( co ) / ( co2 ) ratios
文摘:在某些废钢熔炼过程中，当炉料中含碳及碳氢物质且燃烧不充分时，会带来烟气中一氧化碳的燃爆、油污挥发时造成的烟雾、臭味等问题.通过实验室装置研究含油废钢在加热过程中烟气成分随时间的改变以及二次燃烧率的变化，试验结果表明，反应过程的限制性环节是油分的热分解；在较低的温度下( co ) / ( co2 )比例影响转化率和二次燃烧率；而在任意比例下保证充分反应的温度为900以上