Böblingen Biomass Thermal Power Station - PDF

Böblingen Biomass Thermal Power Station Musberger Sträßle 11 D Böblingen Telephone: / Fax: / Members of the Böblingen RBB Special Purpose Association

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Böblingen Biomass Thermal Power Station Musberger Sträßle 11 D Böblingen Telephone: / Fax: / Members of the Böblingen RBB Special Purpose Association are: County of Böblingen County of Calw City of Stuttgart County of Freudenstadt Delivery hours: Monday Thursday: 7:15 a.m. 5 p.m. Friday: 7:15 a.m. 4 p.m. Mahdentalstraße From Herrenberg interstate A81 Sindelfingen Böblingen-Ost exit from Stuttgart Sindelfingen-Ost exit from Herrenberg From Stuttgart interstate A81 Goldberg Thermal spa Stuttgarter Straße Böblingen Kreiskrankenhaus Waldburgstraße Panzerstraße Herdweg Panzerkaserne Böblingen Residual Waste Thermal Power Station with biomass thermal power station Römerstraße Musberger Sträßle Towards Schönaich Waste disposal site Interplay of perfect integration Technology Experience Environment Optimally combined for energy which matters Edition 2009 Contents Foreword 3 Background and Fundamentals for Construction 4 Biomass as Fuel 5 An Overview of the Biomass Thermal Power Station 6-7 Delivery and Storage 8 Equipment and Combustion 9 Waste Gas Utilization and Purification Energy Generation Input - Output 14 Technical Data 15 Directions Sketch, Journey Description 16 Foreword The environmentally-friendly, high-tech facility Böblingen Residual Waste Thermal Power Station was expanded in the fall of 2008 by the addition of an innovative component: the biomass thermal power station went into operation, and thus the first large-scale facility in which electricity and heat from fine chaff material are generated in Germany. The biomass thermal power station was installed next to the residual waste and slag bunker in the unused hall formerly intended for sewage sludge treatment. It is regarded as the icing on the cake, yet under utilization of the existing infrastructure it optimally supplements the plant profile of the residual waste thermal power station and increases regenerative energy generation. The fuel which feeds the special combustion technique spreader feeding by means of spinner gate concerns fine material with a particle size smaller than 30 mm, which remains on the chaff sites as residue after chaffing and sieving of wood chips from fresh wood. Now they are utilized for energy exploitation and environmentally-friendly energy generation, and the chaff sites will also be relieved as a result. The biomass thermal power station is designed to operate for 6,800 hours per year. The district heating capacity of the residual waste thermal power station can be increased by up to 30,000 megawatt hours per year through the energetic exploitation of approx. 20,000 tons of fine wood chaff material. In accordance with the current feeding volume, we have 16,000 megawatt hours of district heating and 6,000 megawatt hours of electricity annually. In the aggregate with energy generation from waste derived from the residual waste thermal power station, this results in the annual balance of: 160,000 megawatt hours of district heating and 46,000 megawatt hours of electricity. Expressed in terms of figures, this signifies an effective contribution towards climate protection: annual savings of approx. 16 million liters of heating oil, as well as the avoidance of 32,600 tons of carbon dioxide and 26 tons of nitric oxide. Our credo is to invest in future technologies and to rely on renewable energies with corresponding economic advantages, and thus to do something for environmental protection in the local environment. In this connection, the biomass thermal power station with its ingenious generating plant is an important component and makes the residual waste thermal power station better-off by yet another environmentally favorable facet. The investment costs for the construction of the biomass thermal power station amount to about 8 million euros. But in contrast the annual proceeds through the power and district heating output return a profit on the investment in any case. An economically as well as ecologically valuable unit beyond compare was created with the biomass thermal power station at the location of the Böblingen residual waste thermal power station. Zweckverband Restmüllheizkraftwerk Böblingen (RBB Special Purpose Association) Imprint: 2 nd Edition November 2009 Publisher: Böblingen RBB Special Purpose Association Photos: Paul Klöckner, photographer, Böblingen. Fotostudio Naujoks, Stuttgart Layout/concept/design/realization: Marschall Design&Werbung, Böblingen, Concept/text: Medienbüro Claudia Bauernfeind, Hildrizhausen Paper: printed on offset paper from 100 % recycled paper Association Chairman County Commissioner Roland Bernhard Böblingen Managing Director Deputy County Commissioner Wolf Eisenmann Böblingen 3 Background and Fundamentals for Construction Biomass as Fuel In order to close the gap with regard to the energetic exploitation of fine chaff material and to utilize the facility s existing infrastructure as best as possible, the RBB Special Purpose Association is once again relying on innovative solutions. Setting the agenda for the construction of a biomass thermal power station occurred in November The unused hall formerly intended for sewage sludge treatment turned out to be a suitable element for integration into the residual waste thermal power station, whose infrastructure will now be optimally utilized. For instance, the operation can also fall back on the water treatment or the condensate and feed water system. Moreover, the connection for extraction of district heating as well as the network connection for delivery of electrical energy is also available. Another economic aspect is the remuneration of energy generated from biomass. The Special Purpose Association receives bonuses stipulated in the German Renewable Energy Act (EEG). The staff expertise and the co-supervision through the personnel of the Special Purpose Association also signify a great advantage synergies which increase the facility s economic efficiency. In the fall of 2008, the biomass thermal power station went into (trial) operation with an innovative technology. Electricity and heat derived from fine chaff material is now generated on a large scale basis for the first time. Siemens AG Austria delivered the main facility components, including the special combustion technology. The worldwide patented SIPA-PER Reject Power Plant consists of the firebox, the waste-heat boiler, a waste gas purification system Quota distribution Böblingen t/a Calw t/a Association partners Stuttgart t/a and the smokestack as well as the electro-technical equipment. The wood sieve remains will be thrown in over the embers by means of a spinner gate. In contrast to other processes, the fuel does not have to be first laboriously heated before it ignites. The fuel concerns fine material with a particle size smaller than 30 mm and larger than 10 mm. The material remains after two sieving runs during the treatment of wood chips which will be employed for energy generation, for instance at the woodchip thermal power station in Leonberg. These wood sieve remains were stored in much too large quantities at the chaff sites in Böblingen County because they were not retrieved free of charge on a sufficient scale from the surrounding population. Now they can be utilized sensibly. Because this is the intrinsic charm of the biomass thermal power station: it is designed to energetically exploit about 20,000 tons of fine chaff material annually and to convert it into environmentally-friendly energy. The counties Böblingen and Calw as well as the City of Stuttgart divide the quota in the fuel supply, as graphically depicted below. Up to 30,000 megawatt hours of district heating and 7,000 megawatt hours of electricity can be generated annually through the efficient utilization of fine chaff material in the biomass thermal power station. In the future, a few chaff sites will serve exclusively as intermediate storage and for processing, i.e. sieving of the chaff. Since these sites do not have to be managed to the previous extent, this results in cost savings with corresponding advantages for those paying the waste disposal fees. The sieving before delivery to the biomass thermal power station occurs in two stages. This is necessary in order to ensure the material quality of the fuel. Non-combustible material such as stones will be separated from the combustible at this juncture. The quality gained through the sieving increases the calorific value of the fuel, which in turn results in increased energy generation. At the moment, 27 chaff sites for delivery of cut greenery are available to the citizens in Böblingen County. The material is then driven to the specially provided collecting points for further processing with the double advantage that the chaff sites will be quantitatively relieved. Furthermore, sufficient fine material for gardening will also be available to the population, and the moisture content of the fuel for the biomass thermal power station is reduced through the continual removal. The lower the moisture content, the greater the calorific value, which consequently offers the advantage of better heat generation. The fuel used concerns fine material which remains as residue after chaffing and sieving of wood chips from fresh wood and is stored in much too large quantities at the chaff sites. The wood sieve remains will be energetically utilized in a sensible manner at the biomass thermal power station, and relieve the burden on the chaff sites. Since the fuel concerns biogenic wastes, especially tree and hedge cuttings, the biomass thermal power station exclusively produces energy from renewable resources. In order to obtain the Renewable Resources Bonus bonus for electricity remuneration, fossil fuel may not even be utilized for firing the facility. In order to fulfill these prerequisites, the facility is brought to combustion temperature with a special starting mechanism. A slight quantity of dry, easily ignitable material is ignited through an opening in the firebox with the help of a lance. After this lance ignition, the bulging of the ignition material occurs via the dosing screw. Thereby the temperature increases by approx. 50 C per hour until a combustion temperature of 700 C is reached. The spinner gate only utilizes the fine material afterwards, and the temperature increases to approx. 900 C to 1,000 C. Reinhard Schäfers Dipl.-Ing. (FH) BSD GmbH, Haublickstraße 26, D Leinfelden-Echterdingen Telefon 0711/ Telefax 0711/ Diamant kernbohren Fugen schneiden Diamant sägen Beton demontieren 4 5 An Overview of the Biomass Thermal Power Station Front view Rear view Limestone flour silo Firebox Safety pressure relief line with sound absorber Waste gas purification Smokestack Water-steam circulation Fuel feed Opening for combustion air Fuel feed Boiler Water-steam circulation Spinner gate Safety pressure relief line with sound absorber Opening for combustion air Smokestack 6 Boiler water preheater (economizer) 7 Delivery and Storage Equipment and Combustion The fine chaff material as well as the residual waste is delivered via the existing weighing system. The fuel quantity results from the difference during weighing-in and weighing-out. The storage bin is filled with the delivered load via a conveyor. Then the biomass is stored in this 700 cubic meter capacity silo before it is dosed in the combustion via the so-called spinner gate process. A certain volume of fuel has to be constantly available, since the continuously operated facility requires sufficient buffer material for delivery-free days such as weekends and public holidays. The material stored in the silo is transported via the automatic additional sieving by means of conveyor belts into the so-called main chute, which ensures continuous fuel dosing. The flow rate for the material charge is recorded via a scale installed in the conveyor belt. On average, this amounts to 3.7 to 3.8 tons per hour. The main chute is equipped with a fire protection flap which closes automatically in case of a fire. _Zerkleinern _Fördern _Sieben _Separieren _Lagern Vecoplan AG Vor der Bitz Bad Marienberg Tel.: +49 (0) Fax: +49 (0) Resourcen schonen, Wertstoffe, zurück gewinnen, Ersatzbrennstoffe wirtschaftlich aufbereiten. Unsere Ingenieure planen nach IhrenAnforderungen maßgeschneiderte Anlagenlösungen die eine optimale Funktionalität undtrennleistung gewährleisten. Das engagierte Team von Vecoplan steht Ihnen zur Seite wenn es um die Realisierung effzienter Auf - bereitungs- und Recyclingtechnik geht. The dosing screw arrayed beneath the main chute transports the fuel to the spinner gate via a rotary feeder. The fuel is introduced into the firebox with the help of this spinner gate and through co-delivery of carrying air in the combustion chamber, and distributed via the grate. The spinner gate process is a special system for boiler-sparing and efficient combustion, since it is a combination of airborne and grate combustion. The fuel is flung from the spinner gate against the direction of the grate into the firebox. In the process, the majority of the biomass already dries or ignites and chars in the airborne phase. Consequently there is no cold zone in which the fuel has to be heated up before it ignites. Only a slight residual portion of the chaff material is directly incinerated on the grate. The material disperses as a thin layer on the grate. A consistent combustion on the grate is ensured through the different sizes of the fuel and the subsequently resulting varying trajectories. The largely homogeneous firebed is a special advantage of the process and ensures complete burnout of the material. The biomass is quickly and effectively combusted at a combustion temperature between 850 C und 1,000 C. Because of the unique firing system it is possible to combust the fine chaff material while sparing the boiler, resources and nature. In contrast to other incinerator plants, the combustion chamber is separated from the boiler in the Böblingen Biomass Thermal Power Station. The actual combustion takes place in the firebox, whereas the hot flue gases in the boiler will be utilized for steam production. The slagging of the grate is reduced through this process. Slagging is a process in which the material burned to ashes starts to melt and settles on the grate. Since the temperature is kept under the melting point of ash in the firebox, this problem is for the most part averted. Therefore the grate plates have to be changed less often, which entails cost savings. 8 9 Waste Gas Utilization and Purification Ashes and flue (waste) gases remain as end products of combustion. The ashes will be transported via discharge screws into a separate silo, collected there and then removed for treatment. First of all, the existing nitric oxides (NOx) will be minimized in the flue gas. For this purpose a carbamide solution is already introduced into the firebox with the help of an injection of compressed air. This NOx separation by means of carbamide as a reducing agent is called SNCR (selective non-catalytic reduction) process. The investment costs of this form of denitrification plant lie between 10 and 20 percent of the costs for a catalytic process, e.g. as it is applied in the waste gas purification of residual waste combustion. The flue gas travels further in the boiler and is cleaned after cooling down in order to remove the harmful substances contained in it. It is extracted in a pre-cleaner, the so-called cyclone. The flue gas is centrifuged in this cyclone mechanism. As a result of the rotation, a good portion of the dust particles containing harmful substances is flung on the outer walls of the cyclone and discarded downward via a rotary feeder. This principle is comparable with a conventional salad spinner, in which the water is centrifuged through the rotation of the salad. The precision purification in the fabric filter follows on the heels of this rough separation. For this purpose the flue gas is compressed through a filter bag. Thereby the remaining dust particles stick and will be separated. Only then is the purified exhaust air released outward through the smokestack into the atmosphere at an altitude of nearly 40 meters. The fabric filter has a fully automated online cloth cleaning of the filter bags through jets of compressed air. As with the cyclone, the particles will also be discarded from the filter tank via a rotary feeder. Maximieren Sie Ihren Erfolg SIPAPER CIS Reject Power-Anlagen ermöglichen Ihnen eine ebenso umweltfreundliche wie wirtschaftliche Verwertung von Reststoffen und Biomassen in unterschiedlichster Aufbereitung und Zusammensetzung (z. B. Holz, Altholz, Rinde, Späne, Schleifstaub und andere biologische Reststoffe). Ihr Nutzen: Signifikante Einsparungen an Energie- und Entsorgungskosten sowie bei den CO 2 - Emissionen. Weitere Details: The emission values can be kept far below the legally prescribed threshold values with this double purification method. The threshold values for biomass combustion are governed in the 4 th Federal Immission Control Ordinance (BImSchV). Therefore other threshold values apply here, and there are no minimum temperature provisions as with regard to residual waste combustion according to the 17 th BIMSchV. Nevertheless, the emission values of the biomass thermal power station are constantly measured, archived and submitted along with the data of the residual waste thermal power station to the regulatory authority. Answers for industry Energy Generation The products obtained from the biomass thermal power station are electricity and district heating. This takes place as the steam created in the boiler is conducted into a back pressure turbine. The steam is converted into electrical energy by means of this turbine and the downstream generator. In order to feed the electricity into the public network, this is transformed beforehand from 400 volts to 10,000 volts. After discharge of the steam from the turbine, the heat is released via a heat exchanger and delivered as district heating to the district heating networks of the Böblingen and Sindelfingen municipal utilities, which are already connected to the residual waste thermal power station. Because of the consistently applied combined heat & power generation, an annual thermal output of 16,000 megawatt hours is achieved. About 3,000 people can be supplied for a whole year with that. The additional power input of about 6,000 megawatt hours also covers the annual requirement of another 5,200 people. As a result, a total of 28,000 people can be supplied with heat (160,000 MWh) and about 40,000 people with electricity (46,000 MWh) for a whole year through the energy generation from biomass and residual waste. The proportion of district heating and electricity depends on the actual purchase quantity of district heating. It is also particularly linked to the seasons, since much more district heating is required in colder seasons than in warmer seasons. The Böblingen Biomass Thermal Power Station meets the criteria from the German Renewable Energy Act (EEG). It serves the priority purpose of climate protection and belongs to the legal measures with which the dependence on fossil fuels such as petroleum, natural gas or coal shall be reduced. According to the EEG, the power input into the public network will be remunerated with the bonus for renewable energy resources. The bonus for combined heat & power generation (CHP Bonus) also applies to generation of electricity with simultaneous delivery of district heating. The German EEG is also regarded as a success story of remuneration for feeding back into the grid, and has already been adopted by 47 countries. As stated, the energy extracted from the facility is remunerated according to the EEG with the CWP Bonus and the Renewable Resources Bonus. As operator, the Special Purpose Association also consequently gets the benefit of the effect of this
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