SIPAPER Reject Power. Environmental Product Declaration. Pulp and Paper Technologies

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1 SIPAPER Reject Power Environmental Product Declaration Pulp and Paper Technologies

2 Environmental mission statement Design for environment Our knowledge and our solutions are helping to create a better world. We have a responsibility to the wider community and we are committed to environmental protection. In our global operations, featuring a great diversity of processes, products and services, our company is concerned with sustaining the natural resources essential to life. We view the economy, environmental protection and social responsibility as three key factors carrying equal weight in a liberal world market. We support the dissemination of knowledge needed for sustainable development through the transfer of knowledge in the fields of management and technology, wherever we operate as a company. Ecological design is nothing new at Siemens. The company published its in-house standard SN on environmentally compatible product design in 1993, and since then this standard has been an integral part of our product planning and development process. Among other things, it calls for use of separate and distinct material fractions, ease of disassembly, a reduction in the number of components per product, durability, low energy requirements during manufacture and day-to-day use, and the avoidance of hazardous substances. It also lists minimum requirements regarding the parameters to be described in environmental declarations. This standard and our system of environmental management enable us to take a holistic and all-encompassing approach to environmental protection spanning the entire product life cycle from product planning to end-of-life recycling and disposal. We also work with product-specific guidelines that refine the requirements outlined in SN For us, sustainable development in environmental protection means careful use of natural resources, which is why we assess possible environmental impacts in the early stages of product and process development. It is our aim to avoid pollution altogether or to reduce it to a minimum, above and beyond statutory requirements. 2

Energy from waste The challenge Papermaking is an energy-intensive process with a high volume of waste. Both have a direct effect on the environment and the climate.

3 Energy from waste The challenge Papermaking is an energy-intensive process with a high volume of waste. Both have a direct effect on the environment and the climate. And both solution providers and manufacturers are challenged to reduce the energy requirement and minimize the dumping of potentially usable resources. The solution Advantages for the environment Reduction of the use of primary fossil energy by burning biogenic waste materials Combined heat and power cycle (simultaneous generation of electricity and heat for running a factory or generating steam) Reduced emissions of greenhouse gases Substantially reduced waste disposal requirement Siemens has taken up this challenge, and developed a solution, SIPAPER Reject Power, that meets both demands. Reject materials including the peripheral items such as sewage sludge, waste wood, etc. accumulating during paper production are processed according to their different heating values, quantities and dry matter content to produce a fuel mix, which then passes through a spinning wheel feeder to be burnt to produce energy. The steam generated by burning the reject materials can be used either to meet the steam requirements of the paper production or to generate electricity in a combined heat and power cycle. The waste materials are thus used to generate energy, and waste disposal costs are drastically reduced. The flue gas evolved during incineration is cleansed in a twostage, dry absorption process. Acidic constituents (HCl, HF, SO₂) are bound by soda, while furan, dioxin and mercury are retained by coking coal and/or zeolite. An SNCR process extracts the nitrogen oxides. Dust and adsorbable materials are caught in cloth filters.

4 Optimized recycling Main cleansing Pump station Cooling tower Anaerobic reactor Flotation stage Secondary clarification Filter press Electricity Bio and primary sludge Incineration Turbine Decomposition Generator Rejects Sorting Condensation Fibrous sludge Drying paper machine Reject and fibrous materials are collected by SIPAPER Reject Power, separated into their fractions, and processed through shredders, and ferrous and non-ferrous metal separators. The processing homogenizes the fuel mix, among other things it helps to level off the HCI peaks from PVC plastics. Each fraction is metered separately into the fuel mix. This enables the optimum combination of sewage sludge, reject and fibers to be selected at all times and so minimize the need for additional fuel. However, auxiliary firing with oil or natural gas in the combustion chamber is possible so that very moist fuels can be used without difficulty and ensure continuous energy generation at all times. A spreader feeder distributes the fuel evenly over the fire bed in the combustion chamber. This enables a quick reaction to load changes. The even distribution of the fuel across the fire bed keeps the formation of CO and organic carbon compounds to extremely low levels. In the downstream burn-out zone, NO X emissions are reduced by spraying in a urea-water mixture. The heat from combustion is used to generate steam in the heat-recovery boiler. The steam parameters are adjusted to the prevailing requirements for process heat or to drive a steam turbine to generate electricity. The use of primary energy can be reduced by combining the utilization of in-house waste materials with existing steam generating facilities. 4

5 Implementation and evaluation Emissions in the flue gas Emissions: permissible limit = 100 % In 2007, the residual emissions in the waste gas were measured by a downstream flue gas treatment in the MM-Karton works in Hirschwang (Austria). They were well below the strict specifications for permissible waste gas values. 100 % 90 % 80 % 70 % 60 % 50 % 40 % 30 % 20 % 10 % 10 mg/m³ 50 mg/m³ 200 mg/m³ 500 mg/m³ 10 mg/m³ 10 mg/m³ 0 % Dust SO₂ NOX CO Corg HCI Permissible component Actual emission components Greenhouse gas emissions in comparison Greenhouse gas potential A comparative eco-balance was drawn up to evaluate the environmental aspects of the handling of waste materials in the paper industry objectively. The effects of dumping the waste were compared with the consequences of incinerating the wastes to produce usable energy. A 55 % dry weight and a 100 km transport distance to the paper dump were assumed for the fibrous rejects. An average transport distance of 300 km to the industrial or household refuse dump was assumed for the remaining rejects. The evaluation showed the equivalent greenhouse gases measured in kg CO₂ equivalent per kg reject according to the CML 2001 criterion, Dec. 07. CML 2001-Dec. 07 GWP (100 years) [kg CO₂ equiv. per kg reject] Reject Power Dumping CO₂ saving compared with dumping: ~ 0.58 kg CO₂ equivalent per kg reject Eco-Care Matrix (ECM) The environmental benefit based on the savings of greenhouse gas emissions were calculated for a 16-MW Reject Power Station with the following general parameters: Average heating value of the rejects: 9,743 kj/kg Combustion efficiency: 0.93 Coupled power and heating: 0.9 Annual reject quantity: 42,000 t The system costs comprise the investment costs and the operating costs for 20 years and also show the clear superiority of SIPAPER Reject Power over conventional dumping. An investment that pays off. Environmental benefit Dumping Reject Power Customer benefit 5

6 For further information please contact: Siemens AG Industry Sector Industry Solutions Pulp&Paper Technologies Werner-von-Siemens-Str Erlangen Germany The information provided in this brochure contains merely general descriptions or characteristics of performance which in actual case of use do not always apply as described or which may change as a result of further development of the products. An obligation to provide the respective characteristics shall only exist if expressly agreed in the terms of contract. Order No.: E10001-T1-A109-V Printed in Germany Dispo No.: K No.: GB WS Subject to change without prior notice Siemens AG 2010 All rights reserved

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