【Daily Question】Catalytic Coking Reformate Blending Version 20170803

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This post was last edited by Green Lotus on 2017-8-3 at 22:54. To increase the popularity of this section, a daily question activity has been launched; the purpose of this activity is: “Learn a little bit every day, and make significant progress over ten days.” I hope everyone will participate actively; by learning and making progress, they can also easily bring wealth home :) . Participation: Prize of 5 Wealth ； Correct answer: Reward of 10 wealth points ； Note: For questions from the same day, full feedback will be given if answered on the same day; answering the next day earns 5-8 wealth points. This post is valid for 48 hours. http://bbs.hcbbs.com/static/image/hrline/2.gif Fill in the blank: Gasoline engines use for fuel ignition, while diesel engines use . Answer: Ignition-type, compression-ignition-type. Both diesel and gasoline engines are engines in which combustion occurs inside the cylinder. Diesel engines use non-volatile diesel as fuel and operate on a compression-ignition principle. This is because the flash point of diesel is between 67–80°C, and its ignition point is between 98–125°C. Relying on the sparks generated by the spark plugs in the engine, it is difficult to reach temperatures above 98°C in a short period of time; it is rather hard for the sparks from the spark plugs to ignite diesel. However, the auto-ignition temperature of diesel is lower than that of gasoline, at around 330°C, and it also decreases as pressure increases. Taking advantage of this property of diesel, by increasing the compression ratio of the diesel engine, air and diesel are compressed and heated inside the cylinder (to temperatures of 450–750°C), which lowers their auto-ignition point and thus enables the diesel engine to ignite on its own. It also uses compression ignition, eliminating the need for a complex ignition system. Therefore, diesel engines currently all use compression ignition. A gasoline engine is an engine that uses gasoline as fuel and operates on the ignition principle. This is because the flash point of gasoline is generally between -20 and -40°C, its ignition point is below 12°C, while its autoignition point is between 400 and 500°C. From the values of gasoline’s flash point, ignition point, and auto-ignition point, it can be seen that at very low temperatures, gasoline can be easily ignited with just a small spark; it is quite difficult for it to ignite on its own. Therefore, gasoline engines typically use spark ignition. Petroleum Chemical Industry Zone —— “Creative Ideas for Energy Saving” Event (Second phase is in full swing) http://bbs.hcbbs.com/thread-1666758-1-1.html 2017: “My Technical Upgrades” in the Coal Chemical Industry http://bbs.hcbbs.com/thread-1786290-1-1.html [Daily Question] 2017 Summary Post on Catalyst-Based Coking and Reformed Oil Blending http://bbs.hcbbs.com/thread-1811219-1-1.html