Boiler Description - Viessmann Vitoflex 300-RF Technical Data Manual

Vitoflex 300-RF Technical Data

Boiler Description

Boiler Description
Description
The Vitoflex 300-RF Rotating Combustion System (patent
no: EP 0 905 442 B1) was developed for automatic
combustion wood, pellets and wood chips to max. 35%
moister content, see section "Wood Fuel Requirements".
The Vitoflex 300-RF Rotating Combustion System is
characterized by high efficiencies and perfect combustion
at all load levels.
The Vitoflex 300-RF 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 in-feed auger conveys the wood fuel diagonally
from below into the combustion chamber. The holding
devices for the back-burn sensor and the thermal
extinguishing valve are situated on the in-feed auger.
Above the in-feed auger, there is a metering container
with a light barrier to ascertain the level of the fuel
insulating layer required.
- The wood fuel is ignited automatically by an igniter, at
the time of the boiler start. The gasification of the fuel
is carried out on a feed grate moved by a worm-geared
motor. The ash falls in an ash bin below.
An automatic de-ashing assembly with ash is optional.
The combustion chamber is heavily insulated and lined
with fire clay refractory elements.
- The combustion gases rising from the combustion
chamber are swept up by the rotary secondary airflow
brought to bear from the rotation blower and burned
out completely in the round combustion chamber.
The thermal energy from the combustion gases is
transmitted to the boiler water in horizontal heat
exchanger tubes. The combustion chamber is heavily
insulated and provided with excellent access through
the boiler door in the front.
- A flue gas re-circulation system reduces the temperature
in the combustion chamber while maintaining the
highest possible degree of efficiency. This increases
the service life of the un-cooled refractory elements
in the gasification zone. With the basic setting, the
ratio of re-circulated gas to fresh air is precisely
adjusted according to the amount of wood fuel that
is burned. A mechanical adjustable damper provides a
constant ratio of the quantity of re-circulated gas to
fresh air over the entire output range.
- The flue gas exhaust blower is specially designed for
wood heating operation and is very quiet. The motor
has a solid, heat resistant design with a heat dissipation
hub and is spring supported. The blower casing has a
round intake port and a round blowout nozzle
Installation is possible on the top, side or rear of the
flue gas collector within 360° rotation.
Supplied with:
- Boiler with rotary heat exchanger including supply and
return temperature sensors
- combustion chamber with moving grate and light
barriers for ember monitoring
- Igniter
- In-feed auger including insulating layer, safety end
switch for maintenance lid, back-burn temperature
sensor, extinguisher water container with mounting
bracket
- Set of displacement rods
- Flue gas re-circulation system
- Flue gas exhaust blower including flue gas temperature
sensor and oxygen sensor
- Draft damper for installation in the flue gas pipe
- Boiler cleaning tools for the combustion chamber
and heat exchanger
- Installation fittings including pressure relief valve,
drain valve, low water cut off, fixed high limiter,
temperature and pressure gauge
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
- Separate electrical circuit for pneumatic cleaning
system air compressor, when used.
Accessories for Vitoflex 300-RF Rotating Combustion
System:
- Flue gas cyclone 24 USG (90 L)
- Metal mesh filter
- Automatic de-ashing in bin, 63 USG (240 L)
- Automatic de-ashing in bin, 211 USG (800 L)
- Automatic de-ashing in base container
- Pneumatic cleaning system
- Operating pressure 30 or 60 psi
- Two-stage in-feed auger
- Insulation for flue gas re-circulation line
- Thermal safety flush valve
- Slide valve / Rotary valve
- Boiler pump and boiler 3-way mixing valve
- Ecocontrol control system options:
- 3 sensor storage tank management system
- External control module for field supplied extraction
system
- Output module / Input module
- Input module 0-10V
- ModBus
- BacNet gateway
- Visualization
General Information
3