问题描述：
高手请进 翻译成英文
随着炼油工业的不断发展,催化裂化(Fcc)日益成为石油深度加工的重要手
段.在炼油工业中占有举足轻重的地位.FCC工艺是将重质油轻质化,目的产品
是汽油、柴油和液化气.由于转化率高,产品质量好,近半个世纪以来,FCC工
艺技术和生产规模都有了很大的发展.为了满足日益严格的环保要求和市场对烯
烃(特别是丙烯)需求的日益增长,催化裂化工艺技术也在进一步发展和改进.催
化裂化已经成为我国炼油工业的核心技术和石油化工企业经济效益的主要支柱.
作为炼油厂的核心加工装置,催化裂化也面临着越来越多的挑战.不断严格
的环保要求,主要是汽油规格的升级对烯烃和硫含量的要求以及烟气排放量的限
制；对产品需求比例的变化,如市场对柴油需求比例和数量的增加,即所谓的柴
油化趋势.这些都对现有的催化裂化装置与催化裂化的进一步发展形成很大的冲
击.而且除了采用新型有效的降低催化裂化汽油和柴油的硫含量外.还要考虑各
种技术的费用问题.
我国的催化裂化工业自60年代开始发展至今,装置数量和生产能力不断高,
据不完全统计,目前已有催化裂化生产装置近100套,总加工能力超过5000万t/a,
仅次于美国,居世界第二位.近几年渣油催化裂化得到了长足发展,不仅拓宽了FCC 原料来源,而且增加了汽柴油产量,大大加快我国重质油轻质化的进程
问题解答：
我来补答
With the continuous development of oil refining industry, the Fcc catalytic cracking of petroleum deep processing becomes important
Section. In the refining industry plays a decisive role. The FCC process is appropriate, the purpose of heavy oil products
Gasoline, diesel oil and gas is. Due to the high conversion, product quality is good, nearly half a century, the FCC
Art technology and production scale have very big development. In order to meet the requirements of environmental protection and increasingly strict market of propylene
Hydrocarbon (especially propylene), the growing demand in catalytic cracking technology and further development and improvement. push
The refining industry has become a cracking of core technologies and petrochemical enterprise economic benefits of main pillar.
As the core of the refinery process device, catalytic cracking faces more challenges. Constantly strictly
The environmental protection request, mainly is the upgrade of gasoline specification requirements and sulfur content in olefins and flue gas emissions limits
: Demand for products, such as the ratio of diesel market changes and the increasing number of demand, the so-called wood
Oil tendency. All of the existing FCC catalytic cracking unit and the further development of the formation of the big rush
Strike. In addition to using new effectively lower the FCC gasoline and diesel outside the sulfur. Consider each
The cost of technical problems.
The FCC industry in China since the 1960's, device number and production capacity constantly high,
According to not complete count, existing catalytic cracking unit nearly 100 sets of production, processing capacity of more than 5,000 million t/a,
After the United States, ranking second in the world. In recent years, residue catalytic cracking had great progress, not only widen the sources of the raw materials, and FCC gasoline and diesel increased production in China, accelerate the process of heavy oil yields
