Curing Oven Dual Trolley Feed System

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.

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

This 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.

Cire Technologies Supplies New Replacement Burner System

Cire 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.

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 Supplied Dryers Increase Press Line Speed and Quality

This project, installed in Massachusetts, encompassed the design, fabrication and start-up of four new direct impingement dryers for an existing press line upgrade. The process prints water based inks on various substrates. The upgrade has increased the line capability three-fold.

The dryers are designed for 750 fpm printing speeds but are capable of reaching speeds over 1000 fpm. The system includes an innovative design utilizing a single burner system to supply heat to all of the four press dryers while still maintaining independent temperature control for each dryer.

With one burner system and mixing dampers at each dryer the system is easier to maintain and can fit into tight locations. The adjacent picture shows the compact installation of the fan and mixing damper platform on the drive side of the dryers.

Precise control over temperature and impingement velocity is achieved by the dryer design. The temperature is controlled within one degree of setpoint and the impingement velocity can be adjusted with variable speed drives on the recirculating fans.

Automatic controls over the exhaust burner recirculating fans adjust air flows to correspond to the number of presses operating. After starting the burner system and setting the dryer temperatures there is no other operator interaction with the dryer system required. The system is simple and extremely repeatable.