Boiler Description - Viessmann Vitoflex 300-UF Series Installation And Operating Instructions Manual

General Information

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 thermal extinguishing
valve 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 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 door 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 door.
- In the upper part of the combustion chamber door, 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 boiler or on the flue gas
cyclone (optional).
8
Vitoflex 300-UF Installation & Operating
Supplied with:
- Boiler with combustion chamber and pressure vessel/
heat exchanger including supply and return
temperature sensors and over pressure monitor
- 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, safety temperature limiter,
temperature and pressure gauges
- Control cabinet with integrated touch screen boiler
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 mixing valve
- Boiler 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