WEISS’ own steel silo is produced in a wide selection and variations to fulfil our customers’ special silo demands.
The silo can be supplied with:
§ Intermediate floor for installation of outfeed worm screw (optional extras)
§ Inclusive or exclusive of explosion areas in accordance with VDI 3673 (optional extras)
§ Level indicators
§ Complete erection accessories for anchoring
§ Ladder, guard rail and inspection doors
§ Optional RAL colour
§ Dry sprinkler pipe (optional extras)
The silo is made of sand-blasted, primed and painted steel plate, supplied in standard sizes from 100 to 383 m3.
WEISS is also offering mobile fuel storage. Can be supplied complete and with built-in outfeed system. Adapted to lorries’ container hoist system.
WEISS offers a complete product range with self-designed and produced outfeed systems.
For circular silos up to dia. 6.5 m outfeed worm screws type NFU are offered. These circle rotating outfeeders are supplied with capacities of 2-25 m3/h. The special-developed NFUH outfeeder has capacities of 60-100 m3/h depending on the fuel. Further these outfeed systems can be equipped with more distribution lines to supply individual and concurrent fuel usage points.
WEISS is also in a position to supply hydraulic push rod oufeeders specially suited for severe/demanding fuel types, i.e. wet bark. The push rods are used in rectangular silos and will as standard be supplied to concrete silos of 12 m length with optional width. Silo in pit with hydraulic lid for filling from lorry. The silo is emptied with push rod worm screw.
Handling of fuel in major bunker stores is most often done with fully or semi-automatic crane equipment. WEISS offers complete crane systems to comply with individual customer wishes.
Screw conveyors in tray/housing can be supplied to nearly all types of fuel.
WEISS standard programme is dia. 220 – 500 mm. According to wish the screws can be supplied with fixed or variable gear.
A special WEISS developed scrapper conveyor is suited to difficult-to-handle fuels, such as wet bark.
This conveyor type can be supplied in three standard widths adapted to present demands and space available.
The unique WEISS straw combustion plant is based on among other factors our transporting and handling system for big straw bales (600 kg Heston bales).
The Heston bale is placed in a store with integrated transporting system that brings the bale to the straw divider. The divided straw will be pushed onto the grate via hydraulic feed systems.
Stokers are designed for infeed of solid and dry fuels, i.e. saw dust, shavings and pellets. If briquettes shall be combusted, heavy-duty stokers can be supplied.
WEISS’ stoker can feed up to 17 m3/h from each diverter. If required in consideration of either capacity or distribution of the fuel the stoker can be supplied with double or triple diverter. Stokers can be supplied with fixed or variable gear.
HYDRAULIC PUSH FEEDER
For major combustion plants fired with chips, bark or similar solid fuels a hydraulic push rod is used for the infeed.
The hydraulic push rod is designed and manufactured at WEISS in Hadsund and will always be custom-designed to the specific project with its ancillary combustion grate. To conform to the fuel a brick-lined and water-cooled duct is placed in extension of the push rod.
The stationary grate is used for combustion of dry wood waste and chips, sawdust and similar fuels for water contents of max. 25 %.
The combustiongrate is the load-bearing structure of the boiler placed on top of the grate.
The combustion air fans can optionally be place in front or on the sides of the retort and the air is distributed through dampers.
The movable combustion grate is used for both dry and moist fuels. For dry fuels the grate is used in case of major plant outputs or difficult fuel types such as straw, husks and grain. In these particular cases the grate will be designed with water cooling.
In case of moist fuels the combustion chamber will be brick-lined. The design of the brick-lining depends on the water content of the fuel and whether an extra high temperature combustion chamber shall be included in the plant for evaporation of the water.
The grate is developed, designed and constructed by WEISS, and we are continuously focussing on optimization of the grate and the combustion chamber to improve emission levels.
The grate is always custom-designed to take into account the specific fuel specifications and possible limitations in the actual project. WEISS supplies combustion grates to plants producing outputs up to 20 MW.
WEISS boilers are specified, designed and produced in close cooperation with an experienced boiler produced in accordance with WEISS’ long experience within a large spectrum of bio fuels. The design is currently optimized to comply with customer wishes, still stricter demands within environmental measures and of course the unceasing efforts to produce new bio fuel types.
Boiler sizes vary from 0.5 to approx. 20 MW for production of either water or steam.
WEISS designs and manufactures the multi cyclones used for the combustion plants. They are individually designed to each project by our project and design department.
The multi cyclone separates dust particles from the flue gasses after the boiler. The multi cyclones can be supplied in more executions: Non-insulated, partly insulated and insulated all over.
Depending on the size of the combustion plants and the quantity of ashes the multi cyclone can be supplied with ash bin or continuous ash outfeed to the ash conveyor system through a special rotary valve.
FLUE GAS WASHER
WEISS has developed and designed a special flue gas condensing system.
By the flue gas condensation the cold return water is pre-heated by means of the hot flue gas. This is contributing to a total high thermal efficiency of the plant.
Further and by application of reciprocating action the flue gas is washed by the cooling process. This results in a highly efficient wash-out of solid particles reducing the particle emission to an absolute minimum.
The condensation output can contribute with up to 20 % of the total system output.
FLUE GAS FILTER
The flue gas filter is used for separation of solid particles in the flue gas. Particle filters must be used if the particles cannot condensate.
Technologically there are two options: The bag filter or the electro filter. Both options can only separate solid particles. The bag filter is a filter medium through which the flue gas is filtered whereas the electro filter separates the particles by inducing an electric current to the particles.
The bag filter allows addition of possible reactive materials to the flue gas before the filtration. The reactive materials can be lime or active carbon. The electro filter allows higher flue gas temperatures.
CONTROL AND SURVEILLANCE SYSTEMS
The control of a WEISS combustion plant has always had high-priority. For that reason we have ourselves always specified the operating parameters that our plants shall observe.
At present the specifications and concepts of the control panel are determined by our own specialists, this means that programming specialists in consultation with combustion technicians are your guaranty for a quality product fulfilling the stipulated specifications.
As a minimum all our plants are controlled with a view to under-pressure and 02 percentages in the flue gas. For this a frequency converter is used on the flue gas fan. Starting from the smallest industrial plant and upwards as standard all plants are fully modulating within their load area.
As standard the plant is operated via the touch screen mounted in the main switchboard. Through this the operator gains access to change set-points and to watch ordinary functions with alarm lists etc.
In case plants require surveillance of many variable parameters at the same time, for example for the operation of a district heating plant, the plant will be equipped with SRO.
The SRO system allows for central or remote control as well as regulation and surveillance of the complete plant. Typical user interface is an easy-to-use Windows-based system, where a number of operation screen displays is established to correspond with the number of required operator levels.
A WEISS combustion plant equipped with SRO is most often completely fitted-up for fully automatic operation. All regulation parameters will be fully accessible via PC and network. Operation data will be logged and stored for processing and automatic reporting.
WEISS supplies control panels adapted to various national standards and customized to fulfil specific requirements and wishes.
WEISS has a wide range of complementary components to offer our customers the best possible output of their plants.
The components are among others: Flue gas pipes, Walkways, Hydraulic units, Compressors, Steel chimneys, Expansion systems, Pumps, Valves and accessories, Emission measuring instruments, Back-up oil boilers, Emergency power plants, Dissipators for excess heating, Accumulation tanks, Ash conveyor solutions, Water treatment systems, Installation, Insulation, Plants for cleaning of condensation.
Transport worm screw T220T
The transport worm screw is designed for transportation of fine grained material (13x13x13 mm) of maximum 35 % moisture. The material, which is bio fuel, must be suited for this type of transport handling. The transport worm screw can be connected to the out-feeder type NFF-NFU or to a stoker. The transport worm screw is equipped with a direct drive, where the connection between the worm screw and the gear motor is assembled by a chain coupling.
The transport worm screw is provided with variable RPM for measuring the amount of fuel flow in a time unit. The material flow is adjusted by changing the frequency of the motor.
If the transport worm screw is installed in connection with a stoker unit, the fuel will often be transported through an angle piece. The transport worm screw has an inlet and outlet. On the outlet, a micro switch with a sensor is installed which will be activated in case of material overflow. A cleaning door is placed on the outlet of the screw.
Transport worm screw TS250
Transport worm screw TS - 250 is used for transport of chips and shavings from the out-feeding system into, for example, a stoker. The worm is equipped with a gear motor of steady rotation. Inspection door, which is situated over the inlet, is pushed down by a spring. The inspection door is equipped with a micro switch which interrupts the worms operation when it is overflowed with material. The worm can be connected to the NFU or NFF stoker.
Weiss expansion system is mainly used in connection with big heating plants and district heating plants. It is utilised to control excess water pressure from thermal expansion. The expansion system is delivered as a complete system consisting of tank and control system for maintaining the heating plant operation pressure. Pressure-free expansion tank which gives full utilization of the tank volume consequently saves space. The operation pressure is always the lowest possible and is independent of the water level in the tank. Minimal oxidizing of the boiler water which hinders corrosion and increases the plant's service life. A proper size of the tank allows to accomodate the expansion of the water system thus protecting it from exceeding critical pressure limits.
Ash worm type 220-W is used for emptying the ashes. The worm transports ashes from an ash chute to an ash container or ash bin.
Ash worm consists of a worm driven by a gear motor of fixed speed, a worm pipe ø220 mm which is supplied with an inlet and an outlet, and a sealing bearing. The inspection door is placed by the outlet. The door is secured from opening while machine is in operation.
Ash worm type 220-W is available in two modules:
- Type 220 W-1 is used for emptying the ashes from a NT retort / push grate SR-MC and a N-M multi-cyclone (worm pipe can be assembled with a GF-7 ash valve)
- Type 220-W-2 is used for transport of the ashes from the 220-W-1 worm to an ash container (max. length 6m).
These two modules can be assembled into one transport system. Ash worm 220-W-2 can be placed under angle of 0-180 grades in connection to retort/grate (on both sides).