Oxygen Measurement in Vapor Recovery

Process

Vapors build up in the recovery drums/storage tanks due to flashing when introducing new feedstock, pressure changes due to level and/or agitation, and temperature changes. This causes increasing pressure in the head space of the tank, and in some cases can create a hazardous situation. The problem is that the vapor may contain valuable feedstock or environmentally unfriendly chemicals. Vapor Recovery Units (VRUs) were developed to help recover or destroy respectively valuable or hazardous chemicals which may have been traditionally flared or vented. In the case of crude oil tanks, VRUs have a typical hydrocarbon recovery rate of greater than 95% and a payback period of less than one year. Oxygen concentration is important to monitor not only in the knockout drums/storage tanks, but in the flare/vent header as well to prevent explosive/flammable conditions. The oxygen measurement is typically used to shut down the system, or purge with nitrogen, under unsafe conditions. Traditionally, paramagnetic analyzers have been used for this analysis. The paramagnetic measurement is susceptible to error when the sample background changes because of magnetic interference from other molecules. Yokogawa's TDLS product line provides an interference-free, direct measurement.

Expected Benefits

  • No sample system required; 2-5 second response time
  • No interference from other molecules
  • 50 days (TDLS) of historical data and spectra means validation can be performed on current and past measurements
  • In-situ automated validation
  • Purge unit available for area classification
  • 6 month maintenance interval

Product Recommendations

Measure oxygen concentration at the flare line and the recovery drum/storage container (not pictured), using the TDLS8000/TDLS8200.

TDLS220 or TDLS8000 - 1

TDLS8000

Industries

  • Chimie

    Chemical plants rely on continuous and batch production processes, each posing different requirements for a control system. A continuous process calls for a robust and stable control system that will not fail and cause the shutdown of a production line, whereas the emphasis with a batch process is on having a control system that allows great flexibility in making adjustments to formulas, procedures, and the like. Both kinds of systems need to be managed in available quality history of product, and to be able to execute non-routine operations. With its extensive product portfolio, experienced systems engineers, and global sales and service network, Yokogawa has a solution for every plant process.

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  • Chimie de base

    Yokogawa has been serving the bulk chemical market globally and is the recognized leader in this market. With products, solutions, and industry expertise, Yokogawa understands your market and production needs and will work with you to provide a reliable, and cost effective solution through the lifecycle of your plant.

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  • Pétrochimie

    Petrochemical companies’ needs are extremely diverse. To come out ahead in today’s highly competitive marketplace, producers are striving to improve quality and productivity. Yokogawa provides tailor-made solutions for these needs based on its long and wide-ranging experience in this field.

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  • Pétrole et Gaz (raffinage et distribution)

    The oil & gas downstream industry has been facing an increasing number of challenges in recent years. These include the changing characteristics of the feedstock to be processed, aging of process facilities and equipment, rising cost of energy, lack of skilled plant operators who can run a refinery safely and efficiently, and the ever-changing requirements from both the market and the customer.

    Over the years, Yokogawa has partnered with many downstream companies to provide industrial solutions focused on solving these challenges and problems. Yokogawa's VigilantPlant solutions have helped plant owners to achieve maximum profitability and sustainable safety within their plants.

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  • Raffinage

    In the ever changing marketplace, refineries are seen not only as crude processing units but also as profit centers. At the same time, there is a keen awareness of the need for safety at such facilities. A total production solution that encompasses planning, scheduling, management, and control is required to achieve long-term goals for profitability, efficiency, and environmental protection. With years of expertise in the automation field, Yokogawa can bring you affordable total solutions for improved operability and a cleaner world.

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