Cycle-Therm Inc. - designs, manufactures, installs and services regenerative thermal oxidizers

Fabrication RTO Housing photograph
Continuously welded ASTM-A36 1/4" steel plate with pre-mated flanges. Prime and finish painted. Three plus chamber units designed with symmetrical components for future expansion. All fabrication done by certified welders with over 200 RTO unit experience.

Internal Insulation photograph
Preinstalled 6" "Thermal Ceramics." Z-Bloc or Pyro-Fold used in the recovery chambers. 8" Pyro-Bloc used in the combustion chamber. OSHA required 140 degrees Fahrenheit surface temperature. Insulation installed by refractory professionals.

Heat Recovery Control Valves

Multi-Chamber photograph – Butterfly style. Stress relieved disk, ball-bearing supported with stainless steel shafts. Cast steel body of fabricated patented "Superseal" design for 99%+ destruction if required. 1,000 F° standard application design. Designed specifically for RTO use. Over 1,000 in use worldwide.

Two-Chamber photograph – 4-way, patented, prepackaged pretested poppet style valve with electric cam assembly. Knife edge seat deisgn, with ball bearing vertical shaft guide, doft Inconnel seals with air purge system.

Valve Drive System

Patented Valve Drive photograph
The heart of the oxidizer is the patented electro-mechanical 4-way poppet valve. This valve and control system is designed to eliminate the continuous maintenance brought about by the never ending rapid movement and slamming of the disk in typical poppet RTO’s. (1,000,000 cycles/yr.) The two valve discs are concurrently reversed by a common camshaft that intermittently, but consistently moves the valve disks between seats in less than 1/2 second. Since the valves are tied to one camshaft, they operate in unison eliminating valve offset that allows VOC system bypass. No leaky/erratic hydraulics that changes frequency as the weather dictates. No moisture freezing pneumatic lines and cylinders.

Proprietary Purge
Cycletherm's proprietary purge system allows for the last volume of air to the chamber to be diluted with clean air. When the valves switch the resultant VOC spike is minimal as the ppm concentration has been diluted. Hence, there is no need for the added expense of a separate purge chamber and control components offered by some vendors as a solution. In our proprietary design, simplicity yields reliability. A VFD with pressure control loop maintains a steady process suction. This feature minimizes process spikes generic to all two chamber RTOs, allowing for a steady process exhaust flow.

Support Grid photograph
Heat recovery media design specific. Heavy duty truss design, low pressure drop 304 stainless steel. Modular construction used for RTO retrofitting. Designed for uniform flow distribution and upset heat condition tolerance.

Burner System photograph
Maxon "OvenPak" burner with stainless steel cones, refractory firing blocks and pre-piped FM/IRI "block and bleed" pipe trains. Where 2 burners are used, both control systems are completely redundant.... loss of one burner will not affect second burner operation. No remote external blower or high HP motor required.

Manifolds
Minimum 12 Gauge galvanized, aluminized or stainless steel used. Pre-assembled where practical. Pre-mated flanges. Continuous seam welded. All manifolds equipped with combination pre-start purge/pressure relief barometric/standby-run dampers.

Variable Frequency Drive

A Siemens or equal Variable Frequency Drive (VFD) system will automatically control the fan motor speed and associated exhaust fan capacity for all process changes. The VFD also provides a soft start without excessive current draw on initial start-up, and will be housed in a free-standing, NEMA-1 enclosure.
Door-mounted digital instrumentation with the VFD include fault/reset push-button and light; speedometer; ammeter; Hand-Off-Automatic switch; start and stop push buttons; ID-CSI keypad and display; and manual speed settings.
An input AC line reactor is supplied for input noise suppression. A separate dedicated isolation transformer is not required for proper operation or protection of the VFD.
Spinning load start provision enables the VFD to be started into a motor that is already turning. This feature is generally used in conjunction with the auto-restart feature on large inertia loads such as fans.
The VFD proposed will incorporate inductive braking which is necessary for close control of an RTO unit, to within 0.25’’wc. of the inlet pressure requirements, except during valve switching when there will be a generic spike of 0.5 “ w.c. for 1/2 second.

Induced Draft Fan photograph
Robinson BC high efficiency design with unitary base and TEFC motor. Pre-tested and balanced before shipping. Minimum 1/4" plate construction.

Control System
Alan Bradley 405 or 505 PLC driven, Honeywell, FM labeled shutdowns. Touch screen control. Flame failure system(s) hard wired. Software pre-programmed for VFD or damper control. All safeties, alarms, temperatures, pressures, and interlocks tied to telephone modem for off-site troubleshooting. more...

Heat Recovery Media photograph
Site specific application. Conventional saddles, moderate pressure drop saddles, super-low pressure drop random packed silicon carbide, high alumna ceramic monolith, or random packed Cell Stone® ULTRA saddles. more...