All About RECD and how does it works?
                     All About RECD and 
how does it works?
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Table Of Contents
01 What Is RECD?
02 Key Aspects of RECDs:
03 Core Working Principles
04 Its Benefits
05 Conclusion
RECD (Retrofit Emission Control Device) a 
pollution control device that is added to 
existing diesel engines or diesel 
generators to reduce harmful exhaust 
emissions.
Think of an RECD like a smoke filter and chemical 
cleaner for diesel engines, similar to how a water 
purifier cleans dirty water.
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Key Aspects of RECDs: NAME
● Purpose: In General the purpose is to 
bring existing, in-use diesel generators 
(gensets) up to modern emission 
standards.
● Function: In this they use filtration, 
oxidation, and catalytic processes to 
trap and convert pollutants. 
● Mandate: In India, authorities like 
the CPCB and 
National Green Tribunal have 
mandated RECDs for DG sets in 
certain applications, especially 
during air pollution episodes (GRAP). 
● Components: Can include filters and 
after-treatment systems for 
particulate matter and other gases.
● Certification: Must be tested and 
certified by approved bodies like ARAI 
(Automotive Research Association of 
India) for performance and reliability. 
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Core Principles and Working
● High-efficiency filters like DPFs act 
● An Oxidation catalysts converts like a fine net that traps soot and 
carbon monoxides(CO) and tiny particles from exhaust while 
unburned Hydrocarbons(HC) letting cleaner gases pass 
into Carbon Dioxide (CO2) and through.
Water Vapours(H2O)
● Some filterless models use electric ● To prevent filter clogging, the 
fields to charge and collect fine system periodically heats the filter 
particles, then scrape them off. (using catalysts or other methods) 
to burn off the trapped soot, a 
process called regeneration, 
ensuring continuous operation. 
Key Benefits:
● Environmental Protection & ● Operational Efficiency & 
Pollution Reduction: Cost-Effectiveness: ● Improved Brand 
Image (CSR & ESG)
S●ellecLttiioven  gCeartt aEllyqttiiuci  pRmedeuncttt iion  (SCR)::  For  NOx  reducttiion,,  some  RECDs  use  a  urea-based  solluttiion  tthatt  
reactts  wiitth Lifesp NaOnx 
 over  a  cattallystt  tto  ffo●rm
  harmlless  Niittrogen  (N2)  and  Watter  (H2O)
Minimal Maintenance
Conclusion
● The installation of Retrofit Emission Control Devices (RECD) is a crucial,government-
mandated measure for reducing harmful pollutants from existing diesel generators (DG 
sets) in India
● In Concluding RECDS offer a cost-effective, practical solution to meet 
stringent environmental regulations and promote sustainable operations. 
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