Three Canister RTO for Tank Car Loading and Unloading Terminal
Executive Summary
Epcon delivered a high-capacity, three-canister Regenerative Thermal Oxidizer (RTO) system to a tank-car (tank-truck / railcar) loading and unloading terminal. The RTO replaces inefficient open-flare vapor control, offering safe and efficient destruction of fugitive vapors (including chlorinated hydrocarbons), stable emission-control, and lower fuel consumption — even under variable loading/unloading conditions. The solution enables the terminal to remain compliant with environmental regulations while improving operational safety and efficiency.
Project Overview
Tank-car loading and unloading operations routinely release vapor emissions when cars/trucks are filled or emptied. The customer’s facility — accommodating up to three tank cars (and in some configurations up to eight) simultaneously — required robust vapor abatement to prevent VOC/hydrocarbon emissions, odor nuisance, and environmental non-compliance. Previously, such terminals often relied on open-flare technology, which proved insufficient: flares were inefficient, had uncertain destruction-removal efficiency (DRE), and posed safety and environmental risks.
Epcon was contracted to design, fabricate, install and commission a custom Three-Canister Regenerative RTO system, tailored to handle large and variable vapor loads control, ensure high destruction efficiency, and provide reliable, safe vapor treatment for the loading-terminal operations.
The Challenge
Key challenges faced by the terminal:
- Variable and unpredictable vapor loads — depending on how many tank cars are loaded/unloaded simultaneously, the volume and concentration of hydrocarbon vapors fluctuates significantly (1 to several cars at a time).
- Inefficiency and safety issues with open-flare control — flares used previously had no guarantee of DRE, often released unburned fuel vapors, and posed explosion/ fire hazards — especially dangerous in residential-adjacent areas or with chlorinated hydrocarbons present.
- Regulatory compliance and environmental liability — emissions from loading/unloading operations had to be controlled to meet stricter environmental regulations, especially when dealing with chlorinated hydrocarbons or VOCs.
- Need for reliable, continuous operation under variable conditions — the solution had to safely and consistently handle small to large vapor loads, survive frequent load changes, and operate without disrupting loading operations.
The Solution
Epcon engineered and delivered a Three-Canister Regenerative Thermal Oxidizer (RTO) system for the terminal, featuring:
- A multi-canister RTO design — with three ceramic-media heat-exchange beds (canisters) allowing continuous operation even under highly variable vapor loads. The design enables efficient pre-heating and heat recovery, improving fuel efficiency and system stability.
- Automatic capacity adjustment — the RTO dynamically adjusts to the vapor load: whether vapors come from one, two or three simultaneously loaded/unloaded cars the system maintains proper combustion and oxidation, ensuring consistent VOC/HAP destruction regardless of load fluctuations.
- High destruction efficiency and heat recovery system — leveraging the inherent strengths of RTO technology (time, temperature, turbulence), the system oxidizes hydrocarbons and VOCs into CO₂ and H₂O while recovering much of the exhaust heat — improving energy efficiency and reducing fuel consumption compared with open-flare or direct-fired systems.
- Bypass provision for high solvent / upset conditions — for unusually high vapor loads or solvent slugs (“high-solvent bypass”), the design includes safety measures to safely release or manage excess heat/solvent content without compromising DRE or system integrity.
- Turnkey delivery and field commissioning, ensuring that the RTO integrates with the loading terminal’s existing piping/venting layout, minimizing disruption, and providing operator training for safe and compliant operation.
Technical Specifications
Oxidizer Type: Three-canister Regenerative Thermal Oxidizer (RTO) — ceramic-bed, regenerative heat-recovery design
Capacity / Flow Adaptability: Designed to accept vapor loads from 1–3 (or up to 8 under expanded layout) tank cars — adjustable input handling for variable loading/unloading events
VOC/Hydrocarbon Destruction: High destruction/removal efficiency (DRE) — consistent oxidation of hydrocarbon vapors even with variable flow/concentration, converting to CO₂ + water vapor
Heat Recovery Efficiency: Typical RTO heat-recovery (ceramic media) efficiencies: 90–97% for suitable flow/concentration ranges — reducing auxiliary fuel consumption.
Dynamic Load Handling: Automatic valve sequencing and bed switching to handle varying vapor loads, ensuring safe operation and stable combustion under load swings.
Safety & Emissions Compliance: Replacement for open-flare technology eliminates unburned fuel venting; robust combustion minimizes explosion risk; suitable for use in residential or regulated areas where flares are unacceptable.
Delivery Scope: Full engineering, fabrication, installation and field commissioning by Epcon — ready-to-integrate RTO system for tank-car terminal use.
The Results
After installation and commissioning, the terminal experienced:
- Reliable vapor abatement and emissions destruction — hydrocarbon and VOC vapors from loading/unloading are consistently oxidized, eliminating fugitive emissions and reducing environmental risk.
- Improved safety vs open-flare methods — by replacing flares, the terminal avoids unburned fuel release, reduces explosion/fire hazard, and eliminates safety incidents associated with sudden ignition or flare-back.
- Better fuel efficiency and lower operating cost — thanks to regenerative heat recovery and efficient combustion, fuel consumption is lower than flare combustion or direct-fired burners, improving total cost of ownership.
- Flexibility under variable load conditions — the system handles one to multiple simultaneous tank-car operations without loss of performance, enabling safe, compliant terminal operation 24/7.
- Regulatory compliance and environmental responsibility — removal of vapor emissions supports adherence to air-pollution regulations, community-friendly operation (especially useful if near residential areas), and reduces environmental liability.
- Scalable and robust solution for future growth — the RTO design supports expansion (more loading stations / higher throughputs) with minimal incremental investment compared with repeated flare or burner installations.
