3
5443 113 v1.9
Pyrotec Technical Data
Boiler Description
Description
The PYROTEC 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 PYROTEC Grate Firing System is characterized by
highest efficiencies and perfect combustion in all load
stages. The PYROTEC 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 over the burner trough into 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 ignition blower (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 allow
to achieve excellent performance control and highest
safety against back-burn in conjunction with an automatic
de-ashing system (optional) for the combustion chamber.
The solid, horizontally positioned and large-volume
fire box 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 fire box.
- In the upper part of the fire box, 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 fire box door is solidly constructed, air-cooled and
very well insulated. The fire box door is equipped with
solid double-jointed hinges for easy maintenance.
The heat is transferred to the water in the horizontal
tube heat exchanger. The boiler is well insulated and
highly accessible through the boiler door on the front.
A pneumatic cleaning system (optional) can be installed
at the insulated boiler door.
- The flue gas 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
de-duster (optional).
General Information
Supplied with:
- Boiler with fire box and pressure vessel / tube heat
exchanger including supply and return temperature
sensors and over pressure monitor
- Fire box 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, extinguisher valve with strainer, extinguisher
water container with mounting bracket
- Flue gas blower including flue gas temperature sensor
and oxygen sensor
- Boiler cleaning tools for the fire box, combustion
chamber and tube 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 Pyrocontrol control
system
Customer supplied:
- Counter flanges for the boiler supply and return
- Piping to the mixing valve, boiler pump and hot water
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
Accessories for PYROTEC Grate Firing System:
- Flue gas de-duster 63 USG (240 L)
- Flue gas de-duster 211 USG (800 L)
- Automatic de-ashing system in bin, 63 USG (240 L)
- Automatic de-ashing system in bin, 211 USG (800 L)
- Pneumatic cleaning system
- Automatic ignition blower
- Set of displacement rods (for Pyrotec 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
- Pyrocontrol control system options:
- 5 sensor hot water storage tank management system
- External control module for field supplied extraction
system
- Output module / Input module
- Input module 0-10V
- ModBus
- BacNet gateway
- Visualization
