矿业
必达福环境技术过滤技术
矿产行业需要处理各种各样的矿石和石料 - 从沥青、水泥、石膏到石灰。就过滤技术而言，每一种材料对环境的挑战都是独特的：
必达福环境技术凭借专业的过滤技术助力企业持续发展。确保产品质量、实现粉尘排放限值是我们的核心任务。对滤料的特殊要求包括耐磨蚀性、抗静电及耐化学性。
我们为矿产行业所提供的过滤产品范围极广
BWF Envirotec filters offer technically sophisticated solutions for any filter technology process. We offer an extensive range of industrial filters and services for dedusting various production processes. We help our customers meet their production goals.
To this end, we carry out industrial filter and dust analyses for all filter technology applications in our laboratories, recommend solutions for optimising filter systems and provide training courses on filter media, industrial filters and operating know-how in our Training Academy.
PM-Tec® and needlona® filter bags -
Filtration solutions for dedusting in the cement industry
- Safeguarding product quality and complying with the dust emission limit values play a central role in dedusting in the cement industry. This equally applies to waste gases from cement kilns and exhaust air from silos, packing stations, mills and clinker coolers in dust collection systems.
- Our high-performance filter bags ensure reliable, high availability in dust collection systems and fulfil the highest demands in dedusting exhaust air and flue gas.
That's how versatile our range of filters for the minerals industry is
- needlona® (specially developed filters made of needle felt filter media),
- MPS® (fine fibre needle felts with high air permeability and high dust separation),
- ExCharge® (filter media safely dissipate electrostatic charge) and
- PM-Tec® (ePTFE membrane industrial filter made of needle felt or glass fibre for fine dust filtration)
References for filtration systems in the minerals industry
Dust source | Filter medium of the dust collection system Filter medium of the dust collection system | Location of the dust collection system Location of the dust collection system | Number of filter bags Number of filter bags | Inlet load g/Nm3 Inlet load g/Nm3 | Temperature Continuous/Peak °C Temperature Continuous/Peak °C |
Cement industry - Chlorine bypass | Filter medium of the dust collection system needlona® PTFE/PTFE 704 MPS CS30 | Location of the dust collection system Germany | Number of filter bags 1,200 | Inlet load g/Nm3 35 | Temperature Continuous/Peak °C 170-175/190 |
Lime, gypsum, clay industry - Shaft kiln | Filter medium of the dust collection system needlona® PTFE/PTFE 704 MPS CS30 | Location of the dust collection system France | Number of filter bags 572 | Inlet load g/Nm3 10 | Temperature Continuous/Peak °C 170-175/190 |
Lime, gypsum, clay industry - Rotary kiln | Filter medium of the dust collection system PM-Tec® GL 750 | Location of the dust collection system South Africa | Number of filter bags 6,532 | Inlet load g/Nm3 20 | Temperature Continuous/Peak °C 110-160 |
Cement industry - Rotary kiln | Filter medium of the dust collection system PM-Tec® GL 750 | Location of the dust collection system Brazil | Number of filter bags 7,800 | Inlet load g/Nm3 80 | Temperature Continuous/Peak °C 150/210 |
Asphalt industry | Filter medium of the dust collection system needlona® NO/NO 401 CS17 AsphalTec | Location of the dust collection system France | Number of filter bags 480 | Inlet load g/Nm3 250 | Temperature Continuous/Peak °C 80/130 |
- 达到最严苛的粉尘排放标准
- 耐磨性强
- 耐化学性强
- 耐水解
- 过滤性能优异
- 超细粉尘过滤
- 易清灰
- 低残留
- 压差小
PM-Tec® 和 needlona® 滤袋
令人信服的水泥行业烟气过滤解决方案
PM-Tec® 和 needlona®滤袋根据不同的清灰方式，通过各种表面、功能性或保护性的后处理来增强过滤效果；同时更有效地保护过滤介质对抗有害的化学腐蚀和机械磨损。进而实现粉尘排放拦截性能的提高，有效地清灰，低粉尘排放，以及更长的预期使用寿命。
PM-Tec® and needlona®filter bags are custom-designed to suit the requirements of the dedusting process in the dust collection system. This provides you the optimum technical solution for your filtration system. We supply filter bags for every type of dust collection system and application together with the corresponding supporting cages.
Depending on the flue glass cleaning method, the high-efficiency filter media of thefilter bag are enhanced with various surface, functional or protective finishes. These protect the filter medium even more effectively against harmful chemical and mechanical influences. Improved separation behaviour, effective cleaning, low residual dust emission and an extended service life of the filter bags in dust collection systems are thus achieved.
The right filter bag for every application in dust collection systems
Silo, packing station and conveyor systems
Silo filter, packing station and conveyor systems are charged with dry dust, mostly under ambient conditions. Consequently, a economically efficient needlona® needle felt made of polyester can be used. The additional Cementsurf® finish reduces the friction between dust and fibre, thereby not only increasing the degree of cleaning but also the service life of the filter bag in the dust collection system.
Cement mill, separator
High dust loads in dust collection systems from the cement mill or the separator require a resistant filter medium. An oil and water repellent CS17® finish is recommended in countries with a high relative humidity and ensures that the agglomerating dust is not only separated, but is also effectively cleaned from the filter bag. Addition of grinding aids imposes very high demands on the filter medium, as they prevent agglomeration of the cement dust in order to increase mill efficiency. Limited agglomeration behavior hampers dust separation to a considerable extent and therefore maximum-efficiency MPS® or PM-Tec® filter bags are used in dust collection systems.
Coal milling and drying
Since a drying process is involved in addition to milling, increase gas humidity is to be expected. This manifests itself in chemical attack on the polyester fibres due to hydrolysis, such that their resistance is weakened over the course of time. Consequently, BWF Envirotec combines the chemically more susceptible but mechanically stable polyester fibres with the chemically stable but mechanically weaker polyacrylnitrile fibres in order to achieve an optimum filter bag service life and high level of profitability with this compound medium. Owing to potential dust explosion, we recommend the antistatic ExCharge® filter medium for conducting static discharges.
Clinker cooler
The hot clinker dust emerging from the cement kiln is generally cooled with ambient air before further processing. Since they are applied in dry form and without harmful gasses, filter media for filter bags made of m-aramid can achieve long and economically efficient service lives. m-Aramide is characterized by greater sustained temperature resistance with low gas humidity, in addition to less mechanical wear through the effect of the abrasive clinker dust.
Furnace bypass
The currently increasing use of secondary fuels can for example increase the chlorine concentration in the exhaust gas and product to impermissible levels. By extracting a partial stream from the cyclone preheater followed by subsequent cooling, the harmful gases can be effectively separated in solid form by means of a filter bag. The high constant temperatures and corrosive gas and dust composition however require an extremely resistant filter medium. Filter media made of PTFE are perfect for efficient filtration in dust collection systems.
Cement kiln
The common method consists of a rotary kiln with an upstream cyclone preheater. Intensive material and heat exchange occurs here between the downwards flowing raw meal and the upwards flowing exhaust gas. In this manner, not only is the raw meal heated, but also binding of acid components contained in the exhaust gas occurs which might exert a chemical attack on the downstream filter bags. This absorption process is gaining in importance with increasing use of secondary fuels. Long service lives can be achieved with the very economically PPS filter bags at filter inlet temperatures of < 150°C. Filter bags made of polyacrylnitrile homopolymer are also suitable if owing to intensive heat recovery the filter inlet temperature can be reduced to constantly < 120°C and temperature peaks of > 140°C are avoided. A further reduction in costs can be achieved as a result. In case of higher tempratures, BWF Envirotec recommends use of high temperature fibre such as polyimide and fibreglass fabric.
