【Daily Question Question 271】2017.09.29

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This post was last edited by liuquan1100 on 2017-9-29 08:32. [Daily Question No. 271] On 2017.09.29, when the pressure in the system’s main steam pipe decreases, which of the following measures can be taken as a solution? Which one is incorrect? A. Appropriately reduce the hydrogen-to-oil ratio and lower the reaction temperature. B. Reduce the feed rate of raw materials, as well as the flow rate of recycled hydrogen required to maintain the hydrogen-to-oil ratio in the system, thereby reducing the rotational speed. C. Shut down other equipment that uses steam, in order to ensure the operation of the recycled hydrogen compressor. D. Increase the amount of water injected. The reference answers can be seen after responding; scoring is based on identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) The answers to the daily activity questions have changed; today’s answers are shown in the subsequent questions. For management purposes, if you need to view content from a few days ago, please access it through the summary post below. 2017 Q&A Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html (Source: Haichuan Chemical Industry Forum) [Q&A Question No. 261] September 19, 2017: During the shutdown for equipment maintenance, the wastewater from purging the equipment should be discharged into the ( ) system. A. Assume a water purification system B. An oily wastewater system C. A sulfur-containing wastewater system D. Product line B 【Q&A Question 262】 September 20, 2017: The main purpose of hydrogenation catalyst regeneration is ( ). A. Convert the catalyst to an oxidized state. B. Burn off the residual oil and gas in the catalyst. C. Burn off impurities such as carbon deposits on the catalyst. D. Increase the strength of the catalyst. C 【Question and Answer, Question 263】 September 21, 2017: Which of the following factors does not affect the degree of hydrogenation? A. Reaction temperature B. Hydrogen-to-oil ratio C. Tower feed temperature D. Space velocity C 【Q&A Question 264】 September 22, 2017: If the fresh hydrogen compressor in the hydrogenation unit fails and stops operating during normal operation, the feed rate to the reaction system should be stopped immediately. ( ) Judgment: Wrong. [Question and Answer, Question 265] On September 23, 2017, low-temperature dew point corrosion in heating furnaces tends to occur in the ( ) part of the furnace. A. On the furnace tubes in the convection chamber B. At the bottom of the furnace tubes in the radiation chamber C. In the middle section of the furnace tubes in the radiation chamber D. In the air preheater \"D\" 【Question and Answer, Question 266】 September 24, 2017 \"Generally, ( ) is blown into a stripping tower to reduce the vapor pressure of the oil and gas.\" A. Purified air B. 3.5 MPa steam C. 1.0 MPa steam D. Nitrogen \"C [Question and Answer, Question 267] On September 25, 2017, the anti-surge line control valve was manually closed completely before starting up the hydrogenation unit’s cycle hydrogen compressor.\" ( ) Judgment: Wrong. [Question and Answer, Question 268] September 26, 2017: “The composition of hydrogenation catalysts generally does not include () as a component.” A. Active component B. Catalyst assistant C. Carrier D. Ceramic ball D 【Q&A Question 269】 September 27, 2017 “Which of the following is the correct calculation formula for the hydrogen partial pressure in a hydrogenation unit? ( )” A. Hydrogen pressure = Total pressure * Volume fraction of hydrogen in (recycled hydrogen – fresh hydrogen)
B. Hydrogen pressure = Total pressure * Volume fraction of hydrogen in fresh hydrogen
C. Hydrogen pressure = Total pressure * Volume fraction of hydrogen among all gas molecules
D. Hydrogen pressure = Total pressure * Average volume fraction of hydrogen in recycled hydrogen and fresh hydrogen
C 【Q&A Question 270】 September 28, 2017 “At normal temperature and pressure, the ( ) at which a combustible substance forms an explosive mixture in air is called the lower explosion limit.” A. Maximum content B. Minimum content C. Average content D. The smallest value displayed on the explosion detector \"B\"