sfa handels gmbh

SFA Handels GmbH© 2020 SFA Handels GmbH. All rights reserved. Version 02.2021

Company Presentation

SFA Handels GmbH

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• We are a small / medium-sized company right in the middle of Switzerland.• The origin of our company lies in the construction of plants and boilers, we are active in this

sector since 1985.• Because of the market situation in the sector of boiler construction in Europe has changed over

the years, we decided in 1998 to shift our core competencies into the sector of combustion engineering and process engineering.

• Since then, we have adapted our combustion technology to the latest requirements and it has been continually developed.

Contact:SFA Handels GmbHNeue Aarburgerstrasse 20CH-4852 RothristSwitzerlandPhone: +41 (0)62 785 11 85Fax: +41 (0)62 785 11 89E-Mail: [email protected]: www.sfa-anlagenbau.com

About our Company

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Scope of Work

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Main Fuels / Performance Range

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Fuel Specification for Combustion Grate System

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Our Products

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Combustion grate with Steamboiler

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Fuel feeding system with emergency shut-off flap

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Features

• The fuel feeding system is designed for feeding the hopper with a belt conveyor or grabbing crane.

• The feeding hopper is made from sheet steel and Hardox plates in the required thickness with stiffening ribs and possess access and inspection openings.

• Shut-off flap with a single or multiple flap blade, operated by hydraulic cylinders with final position switches.

• Lower part of the chute made complete from sheet steel in the required wall thickness with stiffeners. The chute opens up slightly (3°) towards the bottom.

• Level control for the automatic control and or shutdown of the fuel feeding and the simultaneous alerting, level measurement using a microwave barrier.

• Temperature monitoring and automatic activation of the extinguishing process using steam or water.

• Access and inspection openings for maintenance.• Metal compensator.• The safety-related electronic components are designed according to the latest European

regulations.• The flap blade of the emergency shut-off flap can be easily removed for the maintenance.• Bearings with maintenance-free bearing shells.

Fuel feeding system with emergency shut-off flap

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Input of Fuel

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Input of Fuel

Orange parts are made from casted, heat-resistant stainless steel

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Input of Fuel simplified version for biomass

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Standard version for all kind of Fuels

• Design with a stable sheet steel and Hardox construction in the required thickness.• Front- and sidewalls with cooling jacket in pressureless design. The cooling medium is industrial

water.• The pushers and the opening to the combustion chamber are lined with heat resistant cast parts..• The automatic fire extinguishing system can be operated with water or steam.• All parts which are in contact with the fuel are wear resistant.• All moving parts are lubricated for lifetime and are maintenance-free.• In general, there is for the maintenance and inspection works, a good accessibility to all relevant

components.

Input of Fuel

Simplified version for Biomass

• Simplified version without cooling water jacket and simplified design of the pushers.• The automatic fire extinguishing system can be operated with water or steam.• The pushers as well as the opening to the combustion chamber are lined with wear- and heat-

resistant steel castings.• All parts which are in contact with the fuel are wear resistant.• All moving parts are lubricated for lifetime and are maintenance-free.• In general, there is for the maintenance and inspection works, a good accessibility to all relevant

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Water-cooled combustion grate

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Water-cooled combustion grate module

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Expansion box at grate modules

No gap between grate plates and expansionbox

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Schematic representation of the cooling water circuit

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Pump station for the cooling water circuit

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Suitable fuels for the water-cooled combustion grate are:• All kinds of biomass• Household / Municipal waste (MSW)• Refuse Derived Fuels (RDF), Solid Recovered Fuels (SRF)• Chemical, industrial and hazardous waste• Generally, fuels with a high calorific value ( 7 – 30 MJ/kg / 1’672 – 7’165 kcal/kg)

Features• The combustion grate can be built horizontally or inclined.• Water-cooling of the movable and the fixed grate plates with a closed cooling circuit.• The water-cooled grate can be operated with a high thermal load up to 1.3 MW/m2.• The recovered thermal energy from the cooling circuit can be used for:

– Pre-heating of the combustion air.– Pre-heating of liquids such as turbine condensate and feedwater.

• Massive reduction of the thermal and mechanical stress of the grate plates due to the water-cooling circuit.

• Prevention of material sintering on the combustion grate.• The material expansion of the grate plates is absorbed by the lateral expansion box.• No expansion of the construction and the prevention of cracks on the grate surface.• Minimal material fall-trough and non-ferrous metal accumulation underneath the combustion grate.


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Features• Self-cleaning air outlet openings on the grate plates.• The air outlet openings can be adjusted according to the fuel.• Low operating costs due to high durability of up to 24’000 hours of operation as a guaranteed

value.• The grate plates are casted of CrNiSi 27.4 (1.4823).• In case of a failure of one single cooling line, the combustion grate can still continue to operate.• The grate support and drive system are outside of the combustion grate (no pollution of the

movable parts).• High level of automatization, therefore:

– Controlled combustion management with homogenous burnout.– Optimal possibility to position the fire in the longitudinal direction.– Optimal control of the temperature in the combustion chamber.– Massive reduction of the formation of clinker.

• Optimum fuel / air ratio (excess air ratio of 1.45), therefore:– Reduced flue gas flow.– Low operating costs for SNCR stage.– Low operating costs for electrical power and auxiliary systems.

• With the water-cooled combustion grate it will be reached an overall improvement in the efficiency of the entire system.


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Air-cooled combustion grate horizontal design

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Air-cooled combustion grate inclined design

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Suitable fuels for the air-cooled combustion grate are:• Biomass• Waste with low calorific value • Generally, fuels with a low calorific value ( 6 – 14 MJ/kg / 1’433 – 3’344 kcal/kg)

Features• The combustion grate can be build horizontally or inclined.• Controlled fire management with an equal gas burnout.• Optimal possibility to position the fire in the longitudinal direction.• To prevent that the individual grate bars can lift, they are bolted onto the grate together in bundles.

The weight of these bundles prevents them from lifting.• The material expansion of the grate bars is absorbed through the lateral expansion box.• By bolting the grate bars to bundles, in combination with the expansion box, it prevents the

formation of gaps between the grate bars. This results in a minimal material fall-trough and a minimal ash and non-ferrous metal deposit below the grate.

• Self-cleaning air outlet openings on the grate bars.• Low operating costs due to high durability max. 12’000 hours of operation as a guaranteed value.• The investment cost of the air-cooled grate is significantly lower than for a water-cooled version.

Air-cooled combustion grate

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Combustion air system

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Primary airzone 1 – 3Fresh air

andFGR

123456

Primary airzone 4 – 6Fresh air

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Mixing Box for Primary air and FGR

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Individual air control:• Primary air• Secondary air• Fluegas recirculation system

Features• Fully automatic controlled combustion air system.• 6 primary air zones.• Primary air zones 1 – 3 mixed with recirculated fluegases.• Secondary air on 2 levels in the front- and rear wall.• Possibility to mix the secondary air with recirculated fluegases.• Recirculated fluegases in the area of the input of fuel to prevent back fire.• O2 control for the air zones 1 – 3.• Therefore optimal control of the combustion process and the temperatures in the combustion

chamber.• Pre- heating of the primary air by a heat exchanger with the hot water from the grate water cooling

circuit.• If necessary, additional pre- heating of the primary air by a heat exchanger with steam.• With the hot primary air we achieve a better drying and ignition process in the first grate zones.


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Automatic combustion control system

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Automatic combustion control system: Main cabinet

Siemens Simatic S7. (© SIEMENS)

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The combustion system is the heart of every incineration plant. The subsequent processes such as the water-steam cycle and fluegas cleaning system are strongly influenced by the combustion process. It is therefore very important that the combustion process is stable and continuous.With our automatic combustion control system we achieve a stable and constant combustion process even if the fuel composition is challenging.All process relevant parameters are adjusted automatically according to the leading parameter, which is the steam flow.The temperature in the combustion chamber is constantly monitored at every air zone. There are separate setpoint temperature for every air zone. According to the comparison between the setpointand the actual measured temperature the parameters of the combustion air (Flow amount, oxygen content) are adjusted automatically.Automatic control of the combustion process parameters:• Temperature in the combustion chamber.• Air distribution of the combustion air for each air zone. Control of flow, pressure and oxygen

content for: – Primary air zones 1 – 6, – Secondary air (2 levels at the front wall, 2 levels at the rear wall)

• Recirculated fluegas FGR.• Speed and stroke length of the pushers at input of fuel.• Speed and stroke length of the combustion grate modules (3 – 4 modules, each individually

controlled).• Firing load control according to process needs.• Flue gas oxygen control.• Calorific heating value control.• Temperature control in the input of fuel and the fuel feeding system for fire extinguishing system.• Cooling water system control. (control of the flow, pressure and temperature of the cooling water).

Automatic combustion control system

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Complete power plant design

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Ash removal system

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Bottom Ash Discharger

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Bottom Ash Discharger

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Features• The burned waste materials, that enter the slag chute (ash, slag and non-combustible materials),

get extinguished using a water-filled ash discharger and gets continuously ejected.• Remaining humidity content after the discharge < 15 %.• Our model of the ash discharger is insensitive to larger contaminants (shock absorbers, oil drums,

metal parts with a length up to 800 mm).• The bottom ash discharger is lined with wear-resistant steel (Hardox 450). • The hydraulically driven discharge piston is moved by two hydraulic cylinders, with a pressure

force of 150 kN each.• The risk of blocking of the ash discharger is virtually excluded.• If necessary, a separation of ash / slag and metal can be installed after the ash discharger.

Ash removal System

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Motion compensator for the cooling water circuit

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Features• Motion compensator for the fluid delivery to the moving water-cooled grate rows. • Designed as a fixed, massive tube construction, with the necessary shut-off and safety devices.• Due to the fixed design of the tube connection, we do not need any flexible connections, such as

flexible rubber or metal hoses.• Horizontal movement: < 300 mm• Operating pressure normal: 8 bar• Operating pressure maximum: 13 bar• Inspection pressure: 35 bar• Operating temperature cooling medium normal: 70 / 90 °C• Operating temperature cooling medium max.: < 150 °C• Granted Patent: EP 1983261

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Water-cooled grate plate

• Width: 300 mm• Working stroke: < 300 mm• Operating pressure normal: 8 bar• Operating pressure max.: < 13 bar• Inspection pressure: 35 bar, cold• Operating temperature normal: 70 / 90 °C• Operating temperature max .: < 150 °C• Granted Patents: EP 1760400, EP 2003396, WO 2013029680

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Water-cooled grate plates with fluid connection

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Air outlet openings and scrapers at the water-cooled grate plates

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Water-cooled grate plate

Features • Patented water-cooled grate plate, completely casted from heat-resistant cast steel

with a chrome-content of 27 %.• All parts are in compliance to the Pressure Equipment Directive (PED 2014/68/EU).• Cooling duct with all sides equal size diameter.• Equal wall thickness everywhere on the part.• Very low loss of pressure in the cooling duct of the grate plate.• Complete ventability of the grate plate.• The water-cooled grate plate is casted as one piece! There are no weldings on our grate plate.• The water-cooled grate plates have a special fluid and pressure-tight connection.• For the cleaning of the front air outlet openings, the grate plate has 4 scrapers on the top.

• Width: 300 mm• Working stroke: < 300 mm• Operating pressure normal: 8 bar• Operating pressure max.: < 13 bar• Inspection pressure: 35 bar, cold• Operating temperature normal: 70 / 90 °C• Operating temperature max .: < 150 °C• Cooling water flow 4 m3/h per grate row• Granted Patents: EP 1760400, EP 2003396, WO 2013029680

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Air-cooled grate bar

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Air-cooled grate bar

Features• Air-cooled grate bar, fully casted from heat-resistant cast steel with a chrome-content of 27 %.• For the cleaning of the front air outlet openings the grate bar has 2 or 4 scrapers on the top,

depending on the width of the grate bar.• Width: 100 mm

200 mm• Working stroke: < 300 mm

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Water-cooled vibrating grate

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Suitable fuels for the water-cooled vibrating grate are:• Any kinds of light biomass fuel such as, pods, struts, shells, fibers and kernels, wheat, grain, rice

and corn, coconut, peanut, palm trees, Empty fruit bunches (EFB).• Snippets, chips, pellets, chips and chaff of various biomass.• Stalks and bagasse from the sugar factory.• Biomass waste from the palm oil industry (EFB), as well as tree and forest waste.

Features• Low investment costs, because the use of this combustion technology.• In contrast to the pure water- and air-cooled combustion grate, the operating costs are also lower.• Our design of the water-cooled vibrating grate has an inclination of 6 °.• The water-cooled vibrating grate can be used as a stand-alone module, but it is also possible to

combine several modules in their width so as to obtain more combined grate area.• The heat expansion of the water-cooled vibrating grate is handled by side-mounted, heat-resistant

as well as interchangeable casting plates.• The entire water-cooled vibrating grate consists of a water-cooled surface consisting of membrane

walls and heat-resistant casting plates.• By varying the frequency and the oscillation duration, the residence time of the fuel can be defined

on the water-cooled vibrating grate.• The necessary combustion air is fed to the combustion chamber by a pattern of small holes in the

membrane wall.


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Steam Boiler

Vertical Boiler Design• Used mainly for Biomass, RDF, exact specified

fuels.• Space-saving alternative (footprint).• Cost effective solution.• Cleaning by soot blowers.• Vertical boiler needs more height.• Availability up to 4’000 - 6’000 hrs of operation.• 2 stops per Year necessary for maintenance .• Steam consumption due to soot blowers.

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Steam Boiler Horizontal Design (Tail-End)

Horizontal Boiler Design• Horizontal Boiler design – “Tail-end” Boiler.• Used mainly for MSW and challenging

fuels (inhomogeneous, contaminated, etc.).• Availability up to 8’400 hrs of operation.• Only 1 yearly maintenance stop for boiler.• Cleaning by rapping devices.• Higher initial cost than vertical type.• Needs more length than vertical type.

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Steam Boiler Special Vertical Design by SFA

Special Vertical Boiler Design• Special design developed by SFA.• Used for any kind of fuels (MSW, RDF, industrial

waste, Biomass, etc.).• Combination of the benefits from the vertical

and the benefits from the horizontal type boiler.• Space-saving alternative (footprint).• Cost effective solution.• Availability up to 8’400 hrs of operation.• Only 1 yearly maintenance stop for boiler.• Cleaning by soot blowers and rapping devices.• Only small steam consumption due to soot

blowers.

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Benefits of our Technology

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• Our innovative design is continually being developed, based on our own experience and the feedback of our customers and partners. Thus, we benefit from the operational experience of our customers and offer practical solutions.

• The design of the components is done in close consultation with the partner / customer by the problem definition as well as its requirement profile and its objectives.

• By any investment in the sector of combustion technology you have to pay special attention on the following points :

- High flexibility with regard to the calorific value and particle size of the fuel

- Fast reaction on load changes due to high automation level of the combustion system

- Optimal Price / Performance ratio

- High standard of the technology - Long-term, high availability - Low maintenance time and maintenance costs - The use of standard norm-parts and standard products.- Years-long support from the know-how donors and the suppliers.

• Our core competence is in the combustion technology in the sector of a combustion capacity between 20 – 200 MWth.

• Calorific value range of fuels between 6 – 30 MJ/kg / 1’433 – 7’165 kcal/kg.


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• We develop the process technology with our own personnel and with modern infrastructure and software.

• We have our own know-how in combustion- and process- engineering.• We are able to design, engineer, produce, deliver, install and take in operation all the components

that are included in our scope of supply, as well as complete plants.• Our grate system is build with our patented components:

- Water-cooled grate plate.- Air outlet opening with integrated cleaning scrappers on the water-cooled grate plate and

on the air-cooled grate bar.- Motion compensator for fluid delivery on the water-cooled combustion grate. - Fluid and pressure-tight connection for the water-cooled grate plates.

• We have references in the following sectors:- Biomass- Industrial and Municipal waste- Refuse Derived Fuels (RDF)

• Adequate financing concepts can be offered to potential customers by using the Export Credit Financing facilities of the Swiss Export Risk Insurance (SERV) .


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Many references in various industries Engineering

Chemical Industry, Disposal Industry, Wood Industry, Synthetics, Metal Industry, Paper Industry, Textile Industry, Shipbuilding Industry

General ContractorBiomass, Chemical industry, Garbage/Sewage Sludge and other Industries

Engineering / General ContractorMilitary Enterprises

SFA - References

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Contact:SFA Handels GmbH Phone: +41 (0)62 785 11 85Neue Aarburgerstrasse 20 Fax: +41 (0)62 785 11 89CH-4852 Rothrist E-Mail: [email protected] Homepage: www.sfa-anlagenbau.com

SFA - Contact Details

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sfa handels gmbh

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