is extracted will be decided by the control system according to current requirements. Even small speed reductions will result in significant energy savings. 2) An optimization of the filter system in terms of its
overall eco-efficiency is important. Te power consump- tion of the filter system, durability and renewability of the filter elements, and clean air quality of the filter output have to be reflected in the assessment. Te intended filtration system should ensure high separation efficiency, but without having the disadvantages of conventional high-efficiency filters. Namely, these are high pressure loss and limited life of the filters by clogging surfaces. Here, electrostatic filters have proven to be the optimal solution, because they allow a high degree of separation of emissions such as smoke, dust and fog and ensure only low pressure loss and low energy consumption. Since the filter elements are made of stain- less steel and aluminum, the electrostatic precipitators are very durable. Trough integrated CIP (automatic cleaning system), the maintenance can be kept very low. 3) Te third and perhaps most important technical approach
in many newly built foundries. An interesting alternative to this is the exhaust air mode and a heat recovery system. Here, the filtered air is led outside, but before the heat of the hot exhaust air is recovered by a heat exchanger system with heat pump technology. Tis exhaust system ensures savings about 80%. Heat pumps draw their energy from the relatively warm indoor air, even on cold days. Such a system is much more economical than comparable heating systems and allows a direct transfer of the energy (without buffering) to the supply air to be heated.
Taking Action Te energy consumption in metalcasting facilities depends
on the energy input of the exhaust and supply air systems. High energy consumptions always mean high amounts of CO2 emis- sions. Trough the use of energy-efficient exhaust air filtration systems the air gets clean and significant reductions in carbon dioxide emissions can be done. A diecasting facility can improve its carbon footprint. Te new technology shows that environ- mental compatibility and economic success are not contradic- tory, but actually complement and reinforce one another. An efficient exhaust system can pay for itself with significant savings and competitive advantages. It also improves the ecological footprint of the company by reducing CO2
emissions.
For more about eco-efficient exhaust air filtration systems visit KMA En- vironmental Technology (Shanghai) Co. July 22-24 at China Diecasting 2014, in Shanghai or visit
www.kma-filter.de/kma-international.
is the reduction of heat loss during winter months. Tis can be done by circulating the clean air inside the hall or by heat re- covery systems with highly efficient heat pump technology. Te innovative filter technology of today allows cost-saving alterna- tives to conventional exhaust treatments. Today´s most energy efficient method of waste air treatment is recirculation. Trough the use of highly efficient filter technology—for example, two slot electrostatic precipitators—a high clean air quality is ensured at the filter output, which allows the filtered exhaust air to be led back into the production hall. Te air circulates in the hall and, thus, no heat loss is generated through exhaust air. Accordingly, this method has the greatest potential for energy savings and reduction of CO2
emissions. Te recirculated air system is used
烟能力最适宜在烟雾排放的成型期内优化。何时提取和提 取多少将由智能控制系统根据现行需要予以决定。甚至速 度的小量降低也将会铸就显著的能源节约； 2) 此外，优化过滤系统，对整体生态效益十分重要。 在这次审查中，过滤系统的耗电量、过滤元件的耐用性和 可再生性，以及过滤器输出的净化空气质量需要在评估 过程中反映出来。预期的过滤系统可保证高的分离效率， 但没有传统高效过滤器的缺点。也就是说，如果表面堵塞 的话，过滤器的压力损失就会高，使用寿命也会减短。在 此，静电过滤器已被证实是最佳方案：静电过滤器可分离 油腻排放物，比如烟雾、灰尘和浓雾。因其设计，静电过 滤器可确保较低的压力损失和能源消耗。由于过滤元件由 不锈钢和铝制成，静电除尘器非常耐用。通过整合CIP（ 自动清洗系统），其可减少维护。
3) 第三个，也是最重要的技术方法即：减少寒冬的热损 耗。可通过循环车间里的清洁空气或是使用高效率热泵技术 的热量回收系统予以完成。如今，新颖的过滤技术容许传统 排气处理能够轻松的节约成本：如今废气处理最节能的方法 是再循环空气模式。在此，通过使用高效率的过滤技术， 比如双槽式静电除尘器，可保证过滤器出口优质净化空气， 过滤之后可排放到生产车间。通过排气没有产生热损，空气 可在车间循环。因此，这种节能和减少二氧化碳排放的方法 是最具潜力的方法。这种循环空气模式系统用于许多新建铸 造厂中。替代此种方法的有趣方法为排气模式和热量回收系 统。在此通过热交换器系统使用热泵技术回收热排气的余 热之前，经过滤的空气被排放到室外。这种排气系统可节省 80%的能源成本。公认的排气过滤技术与新的综合热回收 系统（由热交换器和高效排气热泵组成）的结合使得节能成 为可能。热泵可从相对温暖的室内空气汲取能量，在寒冬亦 能如此。因此，这项原则实现了其极高的性能（大于6）（ 即，从1 kW的电能回收6kW的热能）。这种系统超越了类 似的加热系统，成本上更加经济，同时能量可直接转化成（ 没有缓冲）待加热的补给空气。
采取措施应对空气污染
铸造厂中的能源消耗很大程度上取决于排气和送风系 统的能源输入。高能源消耗往往意味着二氧化碳排放量 高。通过使用节能排气过滤系统，使得空气变得清新， 且可减少二氧化碳的排放量。压铸铸造厂能轻松地改善 公司的“碳排放量”并对气候保护做出突出贡献。因 此，每个铸造厂都应该改变自己的价值理念。新的技术 研究表明，环境和经济相容性不相矛盾，实际上两者之 间反而是相互补充和相互加强。投资节能排气系统会让 您获益匪浅：它可为铸造厂提供能源节省和竞争优势， 通过大量减少二氧化碳排放量改善公司的“生态足迹” 。 来自KMA节能排气过滤系统帮助金属铸造设备获得 ISO 9000和ISO 14000认证。
节能排气过滤系统，详情请参见客明环境科技（上海） 有限公司（7月22-24日在上海新国际博览中心（SNIEC） 举行“2014年中国压铸会议”。展位号：D31-3）。
June 2014
FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION | 79
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