Hydrogenation system for producing ultralow-sulfur diesel oil, and method thereof

Abstract

The invention relates to a hydrogenation system for producing ultralow-sulfur diesel oil, and a method thereof. The system comprises a first-segment hydrogenation reaction zone a second-segment hydrogenation reaction zone; the first-segment hydrogenation reaction zone is an upflow fixed bed reactor; the second-segment hydrogenation reaction zone is an active hydrogenation catalyst layer filled in an upper portion of a thermal high stripping reactor; a reaction raw material enters from the bottom of the upflow fixed bed reactor, and a reaction product flows out through the top of the upflow fixed bed reactor and directly enters the thermal high stripping reactor from a position over the second-segment hydrogenation reaction zone; a liquid phase in the upflow fixed bed reactor is a continuous phase, and a gas phase in the upflow fixed bed reactor is a disperse phase; and stripped hydrogen is introduced to the thermal high stripping reactor from a position below the second-segment hydrogenation reaction zone, and the above first-segment hydrogenation reaction product has a countercurrent contact with the stripped hydrogen for a super-deep hydrodesulfurization reaction and product stripping. The above finally-obtained reaction product is partially returned to an inlet of the first-segment hydrogenation reactor as circulation oil. The hydrogenation system for producing ultralow-sulfur diesel oil, and the method are economic and efficient.

Description

technical field [0001] The invention belongs to the hydrogenation technology in the petrochemical field, and further relates to a hydrogenation system and method for producing ultra-low sulfur diesel oil. Background technique [0002] With the increasingly stringent environmental regulations, low-sulfur, low-aromatic, and high-cetane diesel fuel has become the development trend of new diesel specifications in developed countries and regions in the world. Reducing sulfur content is the key to improving diesel cleanliness. EU countries have implemented the Euro V emission standard since 2009, which limits the sulfur content of diesel products to less than 10 μg / g. Developed countries such as the United States and Japan have also promulgated their own diesel product indicators, reducing the sulfur content of diesel products to below 15 μg / g and 10 μg / g respectively. Since 2010, China has implemented the National III standard equivalent to the Euro III emission standard (sulfur...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems in the prior art, the present invention is committed to solving the problems of high energy consumption, large investment and difficulty in producing ultra-low-sulfur diesel products in the traditional trickle bed hydrogenation technology, and provides an economical and efficient continuous production of ultra-low-sulfur diesel. Liquid phase hydrogenation system and method

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