Multiple Smoke and VOC Oxidizer Installation

Cire Technologies is pleased to announce the completion of a year-long project to design, fabricate and install nine recuperative thermal oxidizers with direct feedback heat recovery, for a valued customer in North Carolina. 

Our customer needed the oxidizers to be close to the exhaust of ten process ovens, due to the characteristics of the exhaust streams, which included organic particulate matter and phenol resin.  The request to prevent potential fouling of the oxidizers led to the customer’s desire to implement dedicated oxidizers for each process oven and the use of recuperative thermal oxidizers.  Our design raised each oxidizer directly above the process ovens on mezzanines, minimizing duct runs to the oxidizers.

Because of the energy intensive nature of running the recuperative units, we recommended and implemented waste heat recovery systems for the oxidizers.  Each of eight of the oxidizers uses the hot exhaust air from the oxidizer stack directly back into the ovens as heated make-up air.  Each heat recovery system included an insulated duct from the stack to a set of mixing dampers that mix the cleaned oxidizer exhaust with ambient air from the outside to provide heated make-up air to the ovens.

Attention to design, accounting for the extensive thermal growth of interior components and the stresses created by that growth, ensure the long life of our oxidizers.  See burner support and heat exchanger expansion joint pictures below.



Cire Technologies was responsible for the complete turnkey project including the nine oxidizers, the support mezzanines, modifications to the process ovens and exhaust systems, make-up air ductwork and fans.  All nine oxidizers were delivered on time and on budget.

Cire Technologies is proud of the quality of our equipment and our attention to energy efficiency.  Perhaps you have an oxidizer project with a waste heat source you would like to explore uses for?  We would love to hear from you.

Curing Oven Dual Trolley Feed System

Cire Technologies recently designed, fabricated and installed a new dual feed trolley system for a Massachusetts customer. The trolley system was designed to replace a single forty-five feet long trolley feed system for a horizontal curing oven. By utilizing a dual system, down time between oven curing cycles was essentially eliminated, increasing production throughput by 20%.

Dual Trolley          

  dual trolley2

The system includes side by side trolley systems that are chain driven into and out of the oven. After a hot processed trolley is pulled out of the oven, the trolley frame side shifts to align the second trolley with the oven and then automatically feeds the trolley into the oven.

Sensors and PLC controls automate the loading and unloading of the trolleys with minimal operator interaction, including decoupling of the chain drive systems and the trolleys. Side shifting of the entire trolley system is accomplished through a central shaft driving multiple rack and pinons.

All drive motors include variable speed drives for speed control which can be adjusted through the touchscreen control system.

Cire Technologies Supplies New Replacement Burner System

cire new burner system controlCire Technologies was tasked with designing, fabricating and starting up this new replacement burner system for a paper company in Brazil. This project included a Maxon, Crossfire, burner mounted in an insulated duct, the combustion air fan, a Maxon, Micro-Ratio, gas and combustion air control valve, a new double block and vent gas train and a new control system including a touchscreen HMI and communication capability.  The burner is removable on a rolling frame from the side of the burner duct, through a bolt-on access door, allowing for easy maintenance.

The burner once installed by the customer was started up and tuned by Cire Technologies personnel.

DSC02009ahlstrom field pictures 194






The burner system was provided as a part of a larger process improvement project which significantly increased the production line speed.

The pictures show the burner access door after installation of the burner system, the burner system that was replaced and the burner duct assembly prior to shipping.

Cire Technologies Thermal Recuperative Oxidizer Achieves Greater Than 99.9% Destruction of VOCs

Cire 4k SCFM Thermal Recuperative Oxidizer

Cire Technologies has recently successfully completed the design, fabrication and installation of a new thermal recuperative oxidizer for a metal coating customer in Connecticut. The unit replaced a failing unit but reused the existing fan and stack to save some money for our customer. The oxidizer, rated for 4,000 scfm, includes a 60% efficient primary heat exchanger to preheat the process exhaust to the oxidizer, a 4,000,000 Btu/hr raw gas burner, and a combustion chamber that provides a one second dwell at 1400°F. 


Stack tests of the oxidizer achieved a destruction rate of 99.96%.

The oxidizer includes a heat exchanger bypass to protect the unit against over-heating from high solvent loads, a variable speed drive for the oxidizer fan and automated ramp up and shutdown controls.



Cire Process Line, Including High Temperature Flotation Oven, for Oxidizing Process

b2ap3_thumbnail_hi-temp-floatation-dryer.pngThis project, installed in Massachusetts, encompassed the design, fabrication, installation and start-up of a new process line for a web oxidizing process line. This turnkey installation included the web handling equipment, 3-pass and six temperature zone oven and an interactive computer control system. The process required gentle handling of a brittle product and the demanding service of oven operating temperatures up to 752°F (400°C).

The oven was designed with three, ten-meter passes of floatation ovens. Each pass has two temperature and velocity zones and is heated with electric coils. A high-temperature heat exchanger reduces power requirements by over 60% by capturing the waste heat from the oven exhaust to pre-heat the make-up air supplied to each zone. Careful design and consideration of temperature (on the fly) splice heating station, accumulator, web guides and web rewind. The computer interface control system allows for precise control of the entire line and recipe development.
The project was completed on time and on budget, while exceeding stringent performance specifications. Variable speed drives on all fan motors and precise control of each of the six zones result in a flexible process line, which will allow for process changes as well as accommodating new future products.

For over 20 years, Cire Technologies has provided high quality solutions for the converting industry. The close personal coordination of our senior personnel with our customer insures highly effective solutions in the drying and oxidizer fields. Our services can include any and all phases of a project from conceptual design to final design and fabrication through to the installation and start-up. We look forward to applying our experience to solve your unique challenges.

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