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Kitchen Exhaust Air Treatment

STP Exhaust Odor Destruction

Commercial Kitchen ventilation system serves to dissipate heat, oil, grease, smoke, toxic gases & odour to provide fresh environment in the kitchen. It is important & in some cases mandatory to treat these exhaust pollutants before they are released to atmosphere. In the process of kitchen ventilation, oil & grease gets deposited in inner surface of the exhaust ducts, which is the greatest threat to commercial kitchen. Grease at higher temperature is highly flammable, burning at high temperature can lead to a uncontrollable fire, difficult to control & can eventually spread very fast.

Chemtronics has developed a technique by which kitchen exhaust pollutants, toxic gases, oil, grease & odor can all be easily & comprehensively treated with “ECOBOI” technology.

How it Works :
Kitchen hood extracts all heat, smoke, oil, grease, odor, VOCs & through ductwork & suction fan throws out of the building. Strategically, ECOBOI generator is installed in false celling & an oxidant is conveyed to exhaust duct using special flexible ¼” tubing. High concentration oxidants from ECOBOI gets blended in exhaust air & oxidizes oil & grease aerosols in to moisture, CO2 & fine dust & goes out of the kitchen duct. This on the way out oxidizes other VOCs, toxic fumes & odor withing 4 to 5 seconds. The operation of the unit is automatic & takes signal from exhaust fan, such that it starts automatically when fan starts & goes in standby when air flow is stopped.

Commercial, institutional & residential kitchens were long ducts are involved for exhaust need safety & exhaust air treatment. These are :

Small & big restaurants kitchen, hotels kitchen, hospital kitchen, food court in mall, corporate office kitchen, kitchens of school & collages, kitchen of clubs, sports club kitchen, stadium kitchen, army kitchens, services staff kitchen, temple kitchens, packed & processed food manufacturing.

There are diversified technologies available as a solution. Below table compares different commonly applied techniques in terms of their advantages & disadvantages.

Honey comb Grease filters in Hoods
• Effective on trapping Grease.
• Filters are easy to clean and maintain

• Oil removal efficiency is 30–50 % & Grease removal efficiency is 50–70 %. remaining oil & grease can bypass.
• Performance rapidly decline if not regularly maintained and cleaned
• Poor on Smoke abstraction
• Does not remove Odour
• Oil & Grease in hood filter is serious fire threat.

Fine or pre-filters
• Low capital cost
• Filter change easily carried out
• Low-tech alternative to ESP

• Regular replacement required. So are not used commonly.
• No gaseous odour removal.
• Limited removal of Smoke.
• High pressure drop.
• Oil & Grease in fine filter is serious fire threat.

Electro Static Precipitator (ESP)
• Low pressure drops
• Effective down to very small particle size

• High capital cost
• No gaseous odour removal
• Potential fire risk
• High voltage safety hazard
• High-tech equipment requiring specialist maintenance

Carbon absorption
• High efficiency up to 95% under optimum conditions
• Moderate operating costs
• Relatively low capital cost
• Simple design

• Filter blockage requires regular replacement
• Efficiency decreases with use
• Not effective against particulate components
• Temperature of input must be below 40 °C
• Sensitive to high moisture above 75 %RH
• Constant and detailed maintenance required

In-line Ozone and UV systems
• Minimal pressure drop
• Effective

• Requires pre-filtration or ESPs
• High capital cost
• Dilution and dispersion of residual necessary high energy usage
• Long residence time required

Odour counteraction and neutralisation
• Minimal pressure drop
• Minimal maintenance

• Requires pre-filtration or ESPs
• High capital cost
• Dilution and dispersion of residual necessary high energy usage
• Efficacy for aromatic cooking sources questionable

Wet scrubbing
• Very effective at controlling specific odours (70-80% removal)

• Very high capital cost
• Large area required
• Very high operating cost
• Relatively high pressure drop
• High maintenance cost.
• For complex mixtures of odour may require than one scrubber
• Only really suitable where large volumes of odour laden air require cleaning.
• Generates waste water discharge
• Chemical storage may be required
• May generate visible plume
• May generate secondary odour

Chemtronics ECOBOI - Generators
• Oxidise oil & grease
• Lowers fire hazard
• Keeps duct also clean
• Separate odour control systems not required.
• Moderate capital cost.
• Minimal maintenance or cleaning required.
• Long replacement frequency & cost.
• Low Operational cost.
• Zero pressure drop
• Compact size
• Wide Model Range
• Easy installation.

• Some fine smoke can pass through. -If exhaust duct is short, < 5 meter
• For good performance, contact time is required. -10 seconds
• For high performance exhaust velocities are kept low, so exhaust duct size may increase. < 800 fpm

Process Flow Diagram Presentation Case Study PROSOFT - Software

With the installation of ECOBOI generator one can eliminate the use of electronic filters & Electro Static Precipitator (ESP). But in case of less duct length & lots of smoke, there may be a requirement of installing ESP & ECOBOI together. With both ESP & ECOBOI, design engineer can lower the capacity of both to address the exhaust pollutant at the same time oxidizing greasy duct work. As per site conditions & limitations, experience design consultants selects the one which is technically most optimum & effective, at the same time economically viable. Many time mix of ESP & ECOBOI gives better capital & operational cost benefit. Below are the few generally designed options recommended by us from our past installed site data:

Option 01 – Without ESP : Where the oxidant injection is after the hood in absence of ESP in Exhaust duct.

Option 02 – Pre ESP : Where the oxidant injection is before the ESP in the Exhaust duct.

Option 03 – Post ESP : Where the oxidant injection is after the ESP in the Exhaust duct.

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Email : solution@chemtronicsindia.com
Phone : +91-22-2825 9933
Mr. Sunil Shah : +91-93212 34527
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