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Vitoflex 300-UF Technical Data
Boiler Description
Description
The Vitoflex 300-UF Grate Firing System (patent no: EP
0 905 442 B1) was developed for automatic combustion
of all dry to moist wood fuels (remnant wood, pellets and
forest wood chips to max. W50, (see section “Wood Fuel
Requirements”) and combines the benefits of underfeed
firing with the benefits of grate firing.
The Vitoflex 300-UF Grate Firing System is characterized
by highest efficiencies and perfect combustion in all load
stages. The Vitoflex 300-UF Boiler Plant has been built to
ASME Sec. IV and has CRN for Canada. It is tested and
approved to the applicable CSA / UL safety standards.
Function:
- The solid, powerful and heat-resistant in-feed auger
moves the fuel into the burner trough and onto the
descending and moving grate zone. An electrical and
mechanical temperature sensor to operate the
thermostatic valve for extinguishing assembly are
located on the in-feed auger. Above the auger is the
metering container with a light barrier for setting the
level of the fuel insulating layer.
- The fuel is either ignited manually or automatically with
an automatic igniter (optional). The boiler features a
reliable burner trough, a descending grate and a moving
burn-out grate made from highly-refractory cast steel
[approx.
b
in. (12 mm)]. These items provide for
excellent performance control and highest safety
preventing back-burn in conjunction with an automatic
de-ashing assembly with ash container (optional) for the
combustion chamber. The solid, horizontally positioned
and large-volume combustion chamber has been
optimized in terms of combustion, consists of a high-
quality refractory brick lining and has multiple layers of
insulation for the lowest possible surface temperatures.
A variable speed primary air blower provides preheated
air to the combustion grates in the combustion chamber.
- In the upper part of the combustion chamber, the
secondary air is blown into the gas space of the firing
system by variable speed blower via an encircling ring
with individually adjustable nozzles to achieve high
turbulence. This mixes the fuel gases with fresh
secondary air to achieve perfect combustion and very
low emissions.
The combustion chamber door is solidly constructed,
air-cooled and very well insulated. The combustion
chamber door is equipped with solid double-jointed
hinges for easy maintenance.
The heat is transferred to the water in the horizontal
heat exchanger. The boiler is well insulated and
highly accessible through the heat exchanger door on
the front. A pneumatic cleaning system (optional) can
be installed at the insulated heat exchanger door.
- The flue gas exhaust blower has been specially
designed for wood burning boilers and quiet operation.
The spring- suspended motor has a solid, heat-resistant
design with a heat dissipation hub. The blower housing
on the intake can be mounted radial by 360° and has a
variable rotation speed and a round blow-out nozzle.
It is mounted directly on the flue gas cyclone.
General Information
Supplied with:
- Boiler with combustion chamber and pressure vessel /
heat exchanger including supply and return temperature
sensors and negative pressure monitoring assembly
- Combustion chamber with burner trough, descending
grate, moving burn-out grate and light barriers for
ember
monitoring
- In-feed auger including insulating layer, safety end
switch for maintenance lid, back-burn temperature
sensor, thermostatic valve for extinguishing assembly,
extinguisher water container with mounting bracket
- Flue gas exhaust blower including flue gas temperature
sensor and oxygen sensor
- Boiler cleaning tools for the combustion chamber and
heat
exchanger
- Installation fittings including pressure relief valve, drain
valve, low water cut off, fixed high limit, temperature
and pressure gauges
- Control cabinet with integrated Pyrocontrol control
system
Customer supplied:
- Counter flanges for the boiler supply and return
- Piping to the 3-way mixing valve, boiler pump and
thermal storage tank
- Piping for the safety heat exchanger
- Wiring to the control panel
- Insulation for the flue gas re-circulation line, the flue
gas recirculation system is optional
- Separate electrical circuit for pneumatic cleaning
system, air compressor when provided
Accessories for Vitoflex 300-UF Grate Firing System:
- Flue gas cyclone 63 USG (240 L)
- Flue gas cyclone 211 USG (800 L)
- Automatic de-ashing assembly with ash container,
63 USG (240 L)
- Automatic de-ashing assembly with ash container,
211 USG (800 L)
- Pneumatic cleaning system
- Automatic igniter
- Set of displacement rods (for Vitoflex 300-UF 720,
950 and 1250 only)
- Operating pressure 30 or 60 psi
- Two-stage in-feed auger
- Flue gas recirculation system
- Thermal safety flush valve
- Slide valve / Rotary valve
- Boiler pump and boiler 3-way mixing valve
- Pyrocontrol control system options:
- 5 sensor thermal storage tank management system
- External control module for field supplied extraction
system
- Output module / Input module
- Input module 0-10V
- ModBus
- BacNet gateway
- Visualization
