Used Bag Filters

How Do Bag Filters Work

If you are considering used and surplus bag filters, you must understand its working. Firstly, this filter gets its name from series of bags that are used to remove particulate matter like smoke, dust, and other solid particles from industrial gas streams. These bag filters are used in many industries, such as metal processing, cement manufacturing, power generation, and pharmaceutical production to improve the quality of air in work places and complying with industrial regulations. The following pointers will help you understand its functioning in these facilities:

• The gas stream containing particulates enter the bag filter through the hood or inlet duct. The filters comprise a baffle or diffuser plate, that helps evenly distribute the gas before it enters bag filters.
• The bag filter comprises a casing or housing made of metal that hosts a series of filter bags made of felted or woven fabric materials, such as polypropylene, polyester, and fiberglass. These filters have excellent dust holding capacity and they can withstand challenging operating conditions. The bag filter housing is usually made of metal or any other sturdy material and features an airtight chamber.
• The particulate matter in the gas stream gets entrapped in small pores within the filter bags and clean gas exits the filter through an outlet duct.
• This clean gas is released into the environment or directed to the other part of the industrial process depending on the application.
• In the bag filter, small and large particles adhere to each other and build on the surface of the filter bag, forming a layer of cake. This dust cake thickens over the time and reduces the efficiency of filter. A cleaning mechanism is employed to improve the filter’s performance. Reverse air cleaning, mechanical cleaning, and pulse jet cleaning are a few popular methods used for bag filter cleaning.
  • Mechanical Cleaning: In this type of cleaning, a motor-driven shaking mechanism is employed to shake off the dust from the bags.
  • Pulse Jet Cleaning: In this type of cleaning, compressed air is released into the bag filter. This causes the bag to expand and dust cake is dislodged and falls into the collection hopper at the bottom of the baghouse.
  • Reverse Air Cleaning: A reverse flow of air is passed through the filter bags to dislodge the dust. This dislodged dust falls into the hopper.
• The performance of a bag filter depends on various factors, such as the filter media, periodic cleaning, as well as the operating conditions. If all these factors work effectively, then efficiency as high as 99% particulate removal can be achieved.

Types of Used Bag Filters at J&M Industrial

Here are some types of filters we provide:

• Single bag aluminum filter: This equipment works like a basket strainer which filters out particulate matter to the point where the remaining particles are up to a few microns. Mostly made of steel or aluminum, it’s top portion has an O-ring sealing and the drain is at the bottom.
• Sanitary basket strainer: In this type, at least two to four filters are housed together in one equipment, and is placed on a supporting rack.
• Filter screens for liquid filtration: These filters are resistant to chemicals, vibration, and harsh environments. They may have wire cloth mesh filters.
• Nylon filter: This is a basic nylon filtration bag which retains particles up to around 200-250 microns. It is sealed by an O-ring at the top.
• FTI technology duplex bag: This is a pressure strainer with duplex bags and draining outlet at the bottom.

Comparing Bag Filter Housings vs. Cartridge Filters

Certainly! Bag filter housings and cartridge filters are both common types of filtration systems used in various industries to remove contaminants from liquids. Here’s a comparison based on different aspects:

Filtration Capacity:

• Bag Filter Housings: Typically have a larger filtration capacity compared to cartridge filters. They can hold more contaminants before requiring replacement, making them suitable for applications with higher dirt-holding capacity needs.
• Cartridge Filters: Generally have a lower filtration capacity than bag filters due to their smaller size and surface area.

Flow Rate:

• Bag Filter Housings: Usually offer higher flow rates due to their larger surface area, allowing for more substantial liquid processing.
• Cartridge Filters: Might have a lower flow rate compared to bag filters, mainly due to their smaller size and surface area.

Cost-Effectiveness:

• Bag Filter Housings: Often more cost-effective in terms of the price per unit of filtration capacity.
• Cartridge Filters: Can be more expensive per unit of filtration capacity but might require less frequent replacement.

Maintenance:

• Bag Filter Housings: Generally easier and faster to replace, as the bags can be quickly changed without much hassle.
• Cartridge Filters: Might require more frequent replacements but are relatively easy to install and replace.

Particle Retention:

• Bag Filter Housings: Can capture larger particles but might have slightly lower efficiency in retaining smaller particles.
• Cartridge Filters: Have higher efficiency in retaining smaller particles due to their fine filtration media but may clog faster when dealing with larger contaminants.

Space Efficiency:

• Bag Filter Housings: Often larger and require more space due to their design to accommodate bags of various sizes.
• Cartridge Filters: Compact and space-efficient, making them suitable for applications where space is limited.

Longevity:

• Bag Filter Housings: Generally durable and long-lasting, especially when dealing with large particles.
• Cartridge Filters: Can have a shorter lifespan due to their smaller size and finer filtration, leading to more frequent replacements.

Variety of Options:

• Bag Filter Housings: Come in various sizes and materials but might have fewer options concerning micron ratings.
• Cartridge Filters: Offer a wide range of options in terms of micron ratings, sizes, and materials.

Suitability:

• Bag Filter Housings: Ideal for applications with larger contaminants or high dirt-holding capacity needs, such as in industrial settings.
• Cartridge Filters: Suitable for applications where finer filtration of smaller particles is required or when space is a constraint, such as in laboratories or smaller-scale operations.

Common Construction Materials Used In Bag Filter Housings

Bag filter housings are constructed using various materials, each chosen for its specific properties and suitability for different applications.

• Stainless Steel Bag Filter: Known for its durability, resistance to corrosion, and ability to withstand high temperatures, stainless steel is a popular choice. Its used in applications where there are stringent requirements for hygiene, chemical resistance, and longevity.
• Carbon Steel Bag Filter: Offering robust structural strength, carbon steel is commonly used in industrial applications. Its more susceptible to corrosion compared to stainless steel and might require additional protective coatings in some environments.
• Polypropylene Bag Filter: This thermoplastic polymer is valued for its chemical resistance, lightweight nature, and affordability. Polypropylene is often used in applications where corrosion resistance and cost-effectiveness are important.
• Fiberglass Reinforced Polyester (FRP) Bag Filter: FRP provides excellent resistance to corrosion, making it suitable for harsh chemical environments. Its also lightweight and durable, commonly used in chemical processing and water treatment facilities.
• Polyvinyl Chloride (PVC) Bag Filter: PVC offers good chemical resistance, affordability, and ease of installation. Its commonly used in water treatment and some industrial applications.
• Exotic Alloys Bag Filter: In specialized applications requiring specific material properties, exotic alloys such as Hastelloy, Inconel, or titanium might be used. These materials provide exceptional resistance to highly corrosive or extreme temperature conditions.

Applications of Used Bag Filters

There are many applications of bag filters across industries. Here are some of the application areas:

• Water and wastewater
• Chemicals
• Pulp & paper
• Pharmaceutical
• Food processing
• Breweries

Why Buy Used Bag Filters

There are many benefits of buying used bag filters. Here are some of them.

• Minimized carbon footprint: Using renewable source and ecofriendly products is much being emphasized upon, and rightly so. By using used equipment, you are actually contributing to clean environment. This is because when manufacturing all new equipment, you use any new resources such as metals and chemicals as well as electricity and water. With used equipment, you save on all of these resources.
• Depreciation: Usually, the equipment once used for a long time would undergo wear. However, in reality, old filter bags which are well maintained with periodic maintenance and cleaning actually do not have much depreciation. There depreciation value is lesser than bags which are just a year two old.
• Cost effectiveness: Used filtration bags are obviously less expensive than new ones. With affordability and low depreciation, they become even more cost effective in the long run. Their immediate availability also happens to be the cost saving factor in terms of production time.
• Availability: Used filter bags are easily available and stored in inventory. Hence, they can be shipped immediately. Hence, you do not have to wait for several weeks to months until your new order of filters is dispatched. Also, used filtration bags can also be customized to some extent to suit specific requirements. So, used equipment can be readily shipped or on a need basis.

Why Buy Used and Surplus Bag Filters from J&M Industrial

Being a quality centric organization, we are totally focused on product quality in terms of their structure, design, and operation. We also check the compatibility of our bag filters for your applications. Hence, we have strict testing procedures before any product is shipped out. Our pricing strategies are absolutely fair, and there are no issues with our customer service as well. Here are some more reasons why you may want to buy from us.

• Technical Expertise: Over a period of time and dealing with so many customers, we have developed an expertise in this segment. Our skilled and technically sound team helps you select the right bag based on your application requirement. This is decided only after a detailed discussion with you and answering all the doubts you may have.
• Customer Service: We believe in offering a personal touch when it comes to interacting with customers. Hence we have humans and not chatbots who answer your queries online. Also, we are available on phone and answer your emails. You can visit our facility in person as well, and we will be happy to help you. Our resourceful and efficient sales and aftersales teams lends a personal touch to all our dealings.
• Product Quality: The return on investment for used bag filters is pretty quick although it depends on your business demands and revenues. We offer our customers the best value for their money. This is possible because of our equipment quality, testing techniques, and maintenance and repair services.
• Cost Effectiveness: Used equipment is affordable. Additionally, we offer the best prices on bulk orders.

J&M Industrial has efficient marketing as well as maintenance & support teams who can answer all the relevant questions you may pertaining to the bag filters we offer. You can buy and sell used bag filters, Pressure Filters, Filter Presses and Centrifuges in good condition, and our team will have them checked before we sell to a customer. Based on our quality of customer service as well as products, we have been able to produce a long list of happy and satisfied customers, who have benefitted by using our used filters. In case of any further enquiries, do reach us via phone or email.