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New Heating Systems for Repurposed Flotation Dryers

Cire Technologies, Inc. has extensive experience modifying and repurposing existing equipment.  We recently designed, fabricated and installed new heating systems for four repurposed Worldwide flotation dryer zones for a Connecticut film converting company.  The four zones were used to create two lines of forty-foot drying for aqueous coatings.

The system included four burner boxes with Maxon Ovenpak, natural gas burners.  Temperature control for each zone is independent.

Because of limited space, eight airfoil supply air fans were used: one feeding the top nozzles and one feeding the bottom nozzles of each zone.  The fans for each zone are controlled by variable speed drives to provide flexibility to the dryers’ operation.

Since the dryer boxes’ upper halves retract up to eighteen inches, the design enables the top supply fan and recirculating ductwork to retract with the upper half of the existing dryer zones. 

Ductwork and the burner box were fabricated with stainless steel interior skins, protected by up to four inches of insulation and a 20-gage aluminized exterior skin.

The project also included two exhaust fans and the associated ductwork to deliver the exhaust from each line to atmosphere.

Complete gas trains and controls, utilizing Honeywell flame safeguard and gas train components, were incorporated with the burner box skids to simplify the installation.  Cire Technologies, Inc. also included Allen Bradley I/O modules for each zone to communicate with the line web coating and handling equipment, provided by others.  This enabled the dryers to be integrated with the line control system and HMI.

The entire project from design to completed installation and commissioning was completed on time and on budget.

For more information on how Cire Technologies, Inc. can work with you to update or repurpose existing equipment, please click the Quick Connect or Request Info buttons found on this page.

Metal Coil Processing Impingement Dryer

Dryer for Metal Coil Processing

Fives ST dryer 3Cire Technologies is proud to announce it has completed the design and fabrication of a metal coil dryer to be utilized by a metal finishing company in Mississippi.

The dryer utilizes hot air, direct impingement, both above and below the metal coil to remove the water retained from previous processing.

All interior surfaces of the dryer are fabricated out of stainless steel.  The housing includes four inches of insulation and an aluminized steel exterior skin.

The dryer was completely assembled, wired and piped before shipping.  A Maxon Corporation, Ovenpak, natural gas burner provides the heat for the dryer and the gas train components and flame safeguard are manufactured by Honeywell.Fives ST control panel interior resized

Both the supply/ recirculating air and exhaust air fans include Allen Bradley variable speed drives, which are connected to the main control system utilizing Ethernet protocol.  An Allen Bradley I/O module is included to connect the dryer control system to the production line control system.

The project was completed on time and on budget.

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.

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%.

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 Latest Blogs

Eric Becht
02 May 2014
Projects
At Cire Technologies we are very cognizant of our customers’ cost of operating our equipment. One area we excel at is reusing waste heat from our equipment back into the process. A current project ill...
3
Eric Becht
14 April 2014
Dryer Design
A Sample Dryer Project In this our last post on impingement dryer design we illustrate a simple set of dryer design calculations. Given: Tweb entry=60°FTweb exit=135°FTAir=220°F, TWeb=120°F or the wet...
2
Eric Becht
31 March 2014
Dryer Design
The Primary Components of an Impingement Dryer – Part 2 In this post we continue and finish the discussion of the primary components of an impingement dryer. Impingement Nozzles and Supply Plenums The...
2
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