Metal Coil Processing Impingement Dryer

Replacement Heat Exchanger Pass for Recuperative Thermal Oxidizer

Cire Technologies is pleased to announce the completion the replacement of a recuperative thermal oxidizer heat exchanger pass.

This replacement heat exchanger was the third (hot side) pass of a 12,000 scfm recuperative unit in Massachusetts.  The heat exchanger is a stainless steel tube design that included provision for the high temperature thermal expansion of the tubes and head plate seals to prevent cross contamination of the air streams.

Cire Technologies was responsible for the complete turnkey project including design, fabrication and installation of the tube and shell heat exchanger.  In addition Cire Technologies supplied and installed replacement insulation between this heat exchanger pass and the oxidizer burner.  The project was delivered on time and on budget.

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%.

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.

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.

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

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.