REAL TIME TOC ANALYSIS IN STEAM AND CONDENSATE
Steam in petro/chemical plants could be contaminated with hydrocarbons (TOC = Total Organic Carbons) from various sources. This is often a sign of defects in the process, whether they occur in the heat exchanger, the blow down vessel, the condensate recovery or other parts of the system. Conventional solutions to monitor such contaminations use TOC-analysers that have been developed for water (drinking water, waste water, boiler feed water etc.). This paper presents a solution that is based on an online FID (fl ame ionisation detector) to monitor TOC-contamination directly in the hot steam/hot condensate in real time to allow for quick and reliable treatment (i.e. removal) of the polluted condensate.
The Technical Environment
Steam (LP up to 15bar – 180°C) is one of the major resources in all chemical and petro-chemical plants.
The steam has to be as clean as possible and any contamination of the steam, especially from hydrocarbons (TOC), is a clear sign of an issue with the process.
Production of steam consumes a lot of energy and is expensive. Therefore, the “used” steam, which is now condensate, is re-polished and reused in the steam generator to save money (a closed loop).
The Problem Contamination of the steam and the condensate with TOC can occur. Typically, such contamination results from leakages between the product cycle and the steam cycle.
This contaminated condensate can be hazardous for the whole condensate/steam cycle, the boiler, the pipes, the heat exchanger, the fi lters, and the condensate polishing process. The Challenge
The TOC concentration of the pollution in the steam/condensate cycle has to be monitored to identify problem - but the steam is hot (up to 180°C) and under high pressure (up to 15bar). The quicker the monitoring system provides reliable readings the quicker the necessary action can take place to minimise negative effects in the steam/condensate process.
The Solution
A system with J-FID for the continuous monitoring of the steam and/or the condensate at the given conditions (high temperature and pressure) with a very short response time (<1 sec) and with low detection limits (<0.1ppm) provides the most reliable and robust solution available.
This system is also able to measure light Hydrocarbons (starting with CH4) as well as aliphatic and aromatic compounds.
The J-FID and the steam expansion device provided by the manufacturer JCT Analysentechnik GmbH are very easy to install and maintain.
A continuous and fast TOC-measurement by a J-FID will determine whether the steam can be recycled back to the boiler or has to be discharged.
The JCT TOC-Monitor for Steam Applications
A robust FID (Flame Ionisation Detector) provides monitoring results within seconds to grant quick outfall of the contaminated condensate, reliable control of the whole steam process and safe detection of leakages. The decision to either recycle or discharge the steam can be made within seconds. The solution is applicable in both, steam and condensate pipes.
Main Advantages Compared to
conventional TOC-measurement There are three main technologies that have been used to analyse TOC in condensate: High temperature oxidation to CO2
; Photochemical oxidation with UV light and reagent and Wet Chemical Oxidation.
ANNUAL BUYERS GUIDE 2017 •
WWW.PETRO-ONLINE.COM
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