Fired Heater Optimization using Dynamic Simulation for Transient Plant Operations

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Title Fired Heater Optimization using Dynamic Simulation for Transient Plant Operations
Creator Ahamad, S.
Contributor Thakur, M., Vallavanatt, R.
Date 2017-12-12
Description Paper from the AFRC 2017 conference titled Fired Heater Optimization using Dynamic Simulation for Transient Plant Operations
Abstract Modern petro-chemical industries/ plants utilize Waste Heat Recovery Units (WHRUs) to achieve energy demands and also increase the overall plant energy efficiency. In a typical LNG plant, WHRUs are installed at Gas Turbines exhaust to recover the residual heat from flue gases. As WHRUs cannot provide energy requirements during critical operational transients for example - startup of plant or process units, turbine trips, WHRU trip or maintenance, etc. therefore, fired heaters are used in combination with WHRUs to provide/ meet heating requirements during transient operation and/ or supplemental heating when required.; When an operational WHRU is tripped, the fired heater shall start and ramp-up to compensate for loss in heat duty. To avoid any upsets in heating medium (Hot Oil system) due to the loss of WHRU, the start-up of fired heater and to reach its full capacity is critical. Any upset in hot oil system shall affect the performance of many equipment serviced by hot oil and hence ultimately the plant operation.; This paper analyzes and provide insight into following:; (a) Optimize the fired heater design and operation to bring the fired heater from start to full load in minimum possible time. Various design and operation optimization have been analyzed to bring the hot oil fired heater online at the fastest possible pace without damaging any critical components.; (b) Analyze the Hot oil system response and performance for WHRU failure and start of Fired heater to full capacity. A dynamic simulation was developed to analyze the overall plant performance and whether the system can ride through WHRU upsets without operator intervention or exceeding any key process parameters.; (c) In dynamic simulation, WHRU's and startup heater are modeled including the rate of change in heat duty, damper closing/ opening time for WHRU and ramping up of fired heater along with other equipment's' performance.; The purpose of the system optimization is to ensure that the system operation and controls are stable over the entire upset scenario. The system response times over the entire range of operating scenarios must be able to shift from tripped WHRU's to Fired heater and prevent exceeding any key process performance parameters by some combination of automation and / or operator intervention.
Type Event
Format application/pdf
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Metadata Cataloger Catrina Wilson
ARK ark:/87278/s6np6fcw
Setname uu_afrc
Date Created 2018-12-10
Date Modified 2018-12-10
ID 1388801
Reference URL https://collections.lib.utah.edu/ark:/87278/s6np6fcw