Designing CDU Preheating Train Thermally Coupled to DCU through Vacuum Residue Temperature

13th Topical on Refinery Processing
2010 AIChE Spring Meeting
AIChE Spring Meeting and Global Congress on Process Safety
March 22, 2010 - 8:00pm

Crude oil distillation unit (CDU) and Delayed coking unit (DCU) present significant energy consumption in a refinery, given the high flow rates involved on process streams. As refiners are increasing the process of opportunity crudes, heat integration on these units becomes more relevant. Because DCU is essentially a semi-continuous process, heat integration involving its hot streams may impact considerably the CDU operation. However, thermal coupling between CDU and DCU can be explored through the evaluation of adequate DCU feed temperature. By increasing vacuum residue temperature to DCU, the DCU cooling demand increases while CDU cooling demand decreases. As pinch location on each unit is relatively high, little influence on heating demand is expected, unless the pinch is modified by variation on vacuum residue temperature to DCU. Capital costs are supposed to suffer variations as well, especially on DCU, due to the required area to preheat the feed and to cool the product streams. This work presents the evaluation of DCU feed temperature relevance on both CDU and DCU overall costs and utility consumption, considering grassroots designs, based on Pinch Analysis approach. Steam generation on each unit will be investigated for an interval of vacuum residue temperature, in order to evaluate the replacement of cooling water expenditure by steam generation revenue. The paper will also discuss the impact of increasing thermal coupling between units in terms of flexibility. Design considerations due to eventual operation, such as vacuum unit shutdown, will be addressed as well.

This recording is FREE to members of the Fuels and Petrochemicals Division of AIChE. AIChE members may join the Division for only $10. Join F&PD now and return to this page with your new log-in and you will receive this presentation for FREE.
F&PD Members: Simply click on “click here to buy this archived webcast ” below and your ‘0’ price will appear in your shopping cart.
Professional Development Hours
0.5 PDHs
You will be able to download and print a certificate for these PDH credits once the content has been viewed. If you have already viewed this content, please click here to login.

Would you like to access this content?

No problem. You just have to complete the following steps.

You have completed 0 of 2 steps.

  1. Log in

    You must be logged in to view this content. Log in now.

  2. Purchase Technical Presentation

    You must purchase this technical presentation using one of the options below.
    If you already purchased this content recently, please click here to refresh the system's record of ownerships.

Pricing

Credits 0.5 Use credits
List Price $25.00 Buy now
AIChE Members $15.00 Buy now
AIChE Fuels and Petrochemicals Division Members Free Free access
AIChE Undergraduate Student Members Free Free access
AIChE Graduate Student Members Free Free access
Related Topics: