Fisher Olefins Production Solutions ®
| Fisher® Olefin Production Solutions Olefins economics are driven by petrochemicals prices, feedstock costs, product yields, and consumer demand. Traditional feedstocks have included heavier feedstocks including gas oil, naptha, liquifed petroleum gas (LPG), propane, and butane. Today’s availability of non-traditional feedstocks including ethane, propane, and butane from natural gas liquids (NGLs) has led to costadvantaged olefins production with higher ethylene yields.
Fisher® Olefin Production Solutions | 3 Brochure Contents Page Typical Olefins Production Process Diagram................ 4 Hydrocarbon Feed Control Valve................................. 6 Dilution Steam Ratio Control Valve............................. 6 Burner Fuel Control Valve............................................ 8 Boiler Feedwater Regulator and Startup Valve...........10 Boiler Feedwater Pump Recirculation Valve...............10 Steam Vent Valve..................................................
Typical Olefins Production Process Olefin production plants use a variety of feedstocks. The type of feedstock used will impact the type of recovery technology used. A frontend de-methanizer configuration is highlighted below because of its ability to allow for a variety of feedstocks. Alternative product recovery configurations include front-end de-ethanizer for plants utilizing light feedstocks and front-end de-propanizer for plants using heavier feedstocks.
| Fisher® Olefin Production Solutions Feed gas into the pyrolysis furnace can be a number of feedstocks, including ethane, propane, butane, gas oil, or naphtha. Regardless of feedstock, the feed rate must be balanced with dilution steam to lower hydrocarbon partial pressure and increase olefin yield. An improper ratio reduces efficiency of the furnace and will impact ethylene conversion. Valves in the furnace section play a critical role in maximizing ethylene production and throughput.
Fisher® Olefin Production Solutions | 7 Fisher ET Control Valve with FIELDVUE DVC6200 Digital Valve Controller
| Fisher® Olefin Production Solutions Burner Fuel Control Valve Accurate and precise temperature is needed to maintain optimum furnace performance and prevents undesirable side reactions. Temperature profiles applied along the cracking coil are designed to avoid long residence times at low temperatures. Low temperatures favor reactions involved in the formation of secondary products, thereby reducing olefin yields.
Fisher® Olefin Production Solutions | 9 Fisher ET Control Valve with FIELDVUE DVC6200 Digital Valve Controller
| Fisher® Olefin Production Solutions Boiler Feedwater Regulator and Startup Valve From steam dilution to heat exchange, steam is an essential part of olefin production. The feedwater regulator control valve provides flow to the boiler during normal plant operation when the boiler is under pressure. During this time, the pressure drops are small and cavitation is not a concern. Stable, reliable throttling is most important for efficient boiler operation.
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| Fisher® Olefin Production Solutions Steam Vent Valve Boiler startup requires a gradual temperature and pressure increase in the steam distribution system in order to minimize stress on equipment. A steam vent is useful to vent low temperature and pressure steam containing a large amount of moisture. This allows for a gradual warm up of the steam system. In the event of a pressure surge, the vent system prevents overpressure of critical assets.
Fisher® Olefin Production Solutions | 13 Scan this code or visit www.FisherSevereService.com to learn about the science of noise attenuation in control valves and our history of solving noise issues in facilities just like yours.
| Fisher® Olefin Production Solutions Quench Tower Level Control Valve Cracked gas leaving the furnace must be cooled immediately to prevent formation of undesirable products in secondary reactions. Depending upon the feedstock, water or oil is utilized as quenching medium, with oil commonly used for heavier feedstocks. Consistent quench tower operation delivers desirable feedstock conversion. Heavier hydrocarbons removed from the cracked gas leave the bottom of the tower and are separated downstream.
Fisher® Olefin Production Solutions | 15 Fisher V500 Rotary Control Valve with FIELDVUE DVC6200 Digital Valve Controller
| Fisher® Olefin Production Solutions Compressor Antisurge Valve The availability and efficiency of a plant’s compressors both have a direct impact on the profitability of the facility. Cracked gas compressor downtime will result in lost production. Unexpected operational issues with any of the plant’s refrigerant loops will lead to reduced yields. Compressors also represent some of the most valuable pieces of equipment within an olefin production facility.
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| Fisher® Olefin Production Solutions Rich Amine Letdown Valve Before further processing, carbon dioxide (CO2) and hydrogen sulfide (H2S) are removed from the cracked gas. The presence of H2S can cause serious corrosion issues, and CO2 can freeze in heat exchange and fractionation equipment. Acid gas removal is accomplished by scrubbing with sodium hydroxide on a once-through basis or in combination with a regenerative solvent (amine).
Fisher® Olefin Production Solutions | 19 Fisher ET Control Valve with FIELDVUE DVC6200 Digital Valve Controller
| Fisher® Olefin Production Solutions Amine Pump Recirculation Valve Maintaining the proper flow of lean amine to the acid gas absorber is necessary to ensure sufficient removal of carbon dioxide (CO2) and hydrogen sulfide (H2S) from the cracked gas stream. The lean amine pump ensures the stable flow of amine to the absorber. The amine pump recirculation valve is most commonly used to facilitate startup and commissioning as the acid gas absorber is brought to capacity.
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| Fisher® Olefin Production Solutions Gas-to-Flare Valve Olefin production facilities have a flare system to safeguard against overpressure of critical assets within the plant and to dispose of any waste gas. Failure of the flare system to successfully relieve pressure from the process can lead to unexpected downtime or damage to costly pressure-retaining equipment. Gas-to-flare valves are installed at numerous locations throughout the gas treatment and recovery section.
Fisher® Olefin Production Solutions | 23 Fisher FBT Control Valve with FIELDVUE DVC6200 Digital Valve Controller
| Fisher® Olefin Production Solutions Dryer Switching Valve Cracked gas leaving the compression train is saturated with water that must be removed before fractionation. Without drying, formation of hydrates and ice could cause damage to downstream equipment. Continuous water removal requires multiple adsorption beds. Switching valves are critical for continuous operation between active and regenerating adsorption beds.
Fisher® Olefin Production Solutions | 25 Fisher A81 Control Valve with TopWorx™ DXP Discrete Controller
| Fisher® Olefin Production Solutions Distillation Feed Control Valve The efficiency of a distillation column depends on the amount of contact between the vapor rising and the liquid falling through the column. If the amount of vapor and liquid traveling through the column becomes too great, the column can “flood”. When flooding occurs, the efficiency of the distillation column is dramatically reduced, with corresponding drops in product purity.
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| Fisher® Olefin Production Solutions You’re Never Alone The way you manage key production assets like control valves directly affects your plant’s efficiency, reliability, and profitability. Emerson Process Management’s Fisher Services provides trusted expertise for control valve maintenance and repair.
Fisher® Olefin Production Solutions | 29 Our extensive network of Service Center locations spans every continent. We’re there for you day or night, when and where you need us, 24/7/365. Visit www.Fisher.com/LifecycleServices or scan the QR code to learn more.
| Fisher® Olefin Production Solutions THE CONTROL VALVE YOU CHOOSE MATTERS WHEN YOU HAVE TO ACHIEVE EFFICIENT, PRODUCTIVE, AND RELIABLE PLANT OPERATION. When you buy Fisher control valves, you get the application expertise that comes from more than a century of petrochemical experience. Plus you benefit from millions of dollars of research invested in reliability-centric testing of Fisher control valve technologies.
Fisher® Olefin Production Solutions | 31 PRECISE ACTUATION LOW-EMISSIONS PERFORMANCE HIGH-CYCLE TESTING Antisurge valves must be responsive in order to protect critical and costly compressors from damage during transients. Fisher precision actuation technology enables a full stroke up to 50.8 cm (20 inches) in less than one second and better than 1% positioning accuracy.
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