Diesel generator (DG) sets are widely used in factories, commercial buildings, hospitals, telecom facilities and other establishments that require reliable backup power. Although generators support uninterrupted operations, businesses must also consider exhaust emissions and fuel expenses when managing their equipment.
Businesses evaluating these technologies should compare their operational goals, generator specifications and applicable compliance requirements before selecting a solution. For a more detailed explanation of the differences, read Aceget’s RECD vs Dual Fuel Kit: Key Differences Explained guide, which explores their applications, benefits and selection factors.
What Is an RECD for a Diesel Generator?
A Retrofit Emission Control Device (RECD) is an emission-control system installed on a compatible existing diesel generator. It treats exhaust gases to reduce targeted pollutants, particularly particulate matter, depending on the device's design and performance.
One of the main advantages of a retrofit approach is that businesses may be able to improve exhaust emission control without replacing the entire generator. However, the appropriate device must be selected according to engine specifications, generator capacity, exhaust conditions and applicable technical requirements.
RECD systems require suitable installation, regular inspection and maintenance. Their performance should be assessed using relevant testing procedures and documentation rather than relying solely on general product claims.
For technical information, readers can consult the Central Pollution Control Board's RECD emission compliance testing procedure.
What Is a Dual Fuel Kit?
A Dual Fuel Kit allows a compatible diesel generator to operate using diesel alongside a suitable gaseous fuel, such as natural gas. The system introduces gas into the engine's combustion process while retaining diesel as part of the fuel mixture.
The objective is to substitute a portion of diesel consumption with gas under suitable operating conditions. This can potentially reduce diesel purchases and operating expenses, depending on fuel prices, generator loading, gas availability and the system's actual substitution rate.
A dual fuel installation requires careful consideration of engine compatibility, gas supply infrastructure, safety controls and operating conditions. Not every DG set is suitable for every dual fuel configuration.
Unlike an RECD, a Dual Fuel Kit changes the fuel arrangement rather than primarily treating exhaust after combustion.
RECD vs Dual Fuel Kit: Key Differences
Although both solutions are used with existing generators, their principal functions differ.
1. Primary purpose
An RECD primarily focuses on controlling targeted pollutants in generator exhaust. A Dual Fuel Kit primarily focuses on reducing diesel consumption by substituting a portion of diesel with suitable gaseous fuel.
2. Installation requirements
An RECD is generally integrated into the exhaust system. A Dual Fuel Kit requires appropriate fuel-system integration, gas supply arrangements and safety controls.
3. Fuel consumption
An RECD is not primarily designed to reduce diesel consumption. A Dual Fuel Kit may reduce diesel use when operated under suitable conditions, but the actual savings depend on the installation and operating profile.
4. Maintenance requirements
RECD maintenance may involve inspections, monitoring exhaust backpressure and following prescribed cleaning or regeneration procedures where applicable. Dual Fuel Kit maintenance may include gas-train inspections, leak checks, controller checks and system calibration.
5. Suitability
An RECD may be appropriate when exhaust emission control is the main objective. A Dual Fuel Kit may be suitable when diesel substitution is the priority and reliable gas infrastructure is available.
Neither solution is automatically the better choice in every situation. The correct selection depends on the generator, operating environment and intended outcome.
How to Choose the Right Solution for Your DG Set
Evaluate Your Main Objective
Start by identifying the primary challenge at your facility. If your priority is reducing targeted exhaust pollutants, investigate suitable RECD options. If your objective is reducing diesel consumption, assess whether a dual fuel conversion is technically and economically viable.
Where both goals matter, evaluate the requirements separately before deciding whether one solution or a technically compatible combination is appropriate.
Check Generator Compatibility
Review the generator's capacity, engine model, rated output, operating load and exhaust configuration. For a Dual Fuel Kit, also consider gas pressure, availability and supply arrangements.
A qualified technical assessment can help identify installation limitations and avoid purchasing equipment that is unsuitable for the generator.
Compare Total Operating Costs
The initial equipment price is only one part of the decision. Consider installation expenses, maintenance, consumables, gas infrastructure, fuel prices, service availability and potential downtime.
For a dual fuel system, estimate diesel savings using realistic operating hours, load patterns and expected gas substitution. For an RECD, evaluate maintenance costs and the requirements associated with its intended emission-control application.
Review Applicable Regulations
Before installing either system, verify the regulatory requirements that apply to your generator, location and operating conditions. A fuel-saving conversion should not be assumed to satisfy an emission-control requirement, and installing an RECD should not be treated as automatic proof of compliance.
The Commission for Air Quality Management (CAQM) provides official information and directions relevant to air-quality management in Delhi NCR. Businesses should consult the latest applicable orders and confirm specific requirements with the relevant authorities.
Can RECD and Dual Fuel Technologies Work Together?
In some installations, an RECD and a Dual Fuel Kit may be technically compatible because they perform different functions. The dual fuel system changes the fuel mixture, while the RECD treats exhaust emissions.
However, combining them requires a proper engineering assessment. Changes in combustion can affect exhaust temperature and composition, while an exhaust-treatment device can influence backpressure. These factors may affect system calibration and operation.