JET PULSE DUST SUCTION BAG FILTER
TeknoFilter has been engaged in the design and manufacture of fabric filter systems with different configurations to suit different applications. The product range on offer today covers Pulse JetBag Filters designed structurally supported modular type units. Design detail and quality of fabrication can mean the difference between outstanding performance and mediocre.
Whether standard filters or customized filter systems you always get the best advice from the specialists in plant manufacturing. We will design the ideal system for you according to your specifications, without interruptions or delays but always with the unconditional TeknoFilter’s quality standards.
TeknoFilter brings to customers extensive experience in industrial applications expertise through technology partnerships and strategic alliances.
TEKNOFILTER DUST COLLECTORSARE USED FOR BOTH VENTING AND DUST SUCTION APLICATIONS OUR BEST DESIGN DUST FILTER GUARANTEES HIGH EFFICIENCY DUST SUCTION.
TECHNICAL SPECIFACATION OF JET PULSE DUST SUCTION FILTER
TeknoFilter pulse jet filter is a continuous self-cleaning filter. A jet of high-pressure air from a compressed air header is directed into each bag at periodic intervals. Air is distributed to each row of filter bags through a diaphragm valve and blow tube equipped with drilled nozzles. The high-pressure reverse flow of air momentarily stops the normal flow and creates a shock wave that knocks the dust from each bag. A percentage of the dust cake will fall away from the bag into the filter hopper. It is normal for some of the dust to reentrain on to the bag.
Features of dust suction filters;
Best price quality ratio
Carbon Steel or Stainless steel
High filtration efficiency
Easy maintenance and filtering element replacement
Tool free filtering element removal
Reduced maintenance costs
Increased work safety
Low operating costs
Optional electronic differential pressure meter
Dust collecting hopper with bucket, butterfly valve or rotary valve
TeknoFilter dust suction jet pulse bag filter; some of the common applications include size reduction machinery, spray dryers, separators, calciners, mixers, packaging machines, conveyors, chemical manufacturers, foundries, grinders, and many other industrial applications.
The pulse jet bag filter basically consists of the filtration elements housed in a casing, this casing is a hopper with a discharge valve, to continuously remove the dust that is collected on the bags. The entire unit is supported from the ground on structural legs. A caged ladder provides access to the top of the unit for maintenance. The dust laden air enters through the hopper by suction (normally) or (positive pressure). The heavier dust particles fall off at the entry itself, while the lighter dusts get carried upward to the bags. The dust gets deposited on the outer surface of the bags and the clean air moves upward from the center of the bags through the outlet plenum to the top air outlet. This is known as filtration. The dust collected on the outer surface of the bags is removed in a pre-determined cycle by a momentary pulse of high-pressure compressed air. The compressed air moves from an air reservoir or compressed air header via the particular pulse valve into the compartment manifold and thereon into the bags in the row beneath it. The pressurised entry of compressed air through the venturis into the bags, inflate the latter. and the dust cake formed on the bag surface slides down in the form of flakes. The cages help the bags retain their original shape once the effect of the compressed air is gone. This completes the cleaning process. The dust slides down the hopper walls to the rotary air lock valve. The latter is a rotating device which discharges the dust continuously, all the while maintaining an air seal.
Jet Pulse Dust Suctıon Filter Bags Types;
Dust suction filter bags is manufactured from various materials, which provide different beneficial characteristics. Below is a Fabric Selection chart, which summarizes some of the properties of common fabric materials.
Polypropylene jet pulse filter bags
This synthetic is available in both continuous filament and staple fiber form and is produced as either a felt or woven material. Its major limitation is its low maximum continuous operating temperature of 88°C. Oxidizing agents, copper, and related salts damage polypropylene. Its primary benefit is that it is non-hygroscopic (does not chemically react with water). It exhibits great resistance to static build-up and abrasion, and provides a slick surface for good dust cake release during bag cleaning. Polypropylene is widely used in the food, detergent, chemical processing, pharmaceutical, and tobacco industries.
Acrylic jet pulse filter bags
These synthetic fibers offer good hydrolytic resistance over a limited temperature range, 127°C) continuous, 135°C surge. Acrylic fibers are used in the manufacture of ferrous and nonferrous metals, carbon black, cement, lime, fertilizers, and following spray-dryers in coal-fired burners. They are also used extensively in wet-filtration applications.
Today, polyesters are among the most widely used fabrics for general applications below 135°C, their maximum continuous use temperature. Their maximum surge temperature is about 149°C. Polyester fibers are produced in both filament and staple form and are available in both woven and felted fabrics. The primary damaging agents are water (hydrolysis) and concentrated sulfuric, nitric, and carbolic acids. They have good resistance to weak alkalies and fair resistance to strong alkalies at low temperatures. They have good resistance to most oxidizing agents and excellent resistance to most organic solvents.
Ryton jet pulse filter bags
This is a relatively new synthetic fiber with a moderate temperature range, 190°C continuous, 232°C surge. It will hydrolyze, but only at temperatures above 190°C . It has excellent resistance to both acids and alkalies, which makes it very useful in combustion-control applications. Its early applications have been on industrial coal-fired boilers, waste-to-energy incineration (with and without spray dryers), titanium dioxide, and installations where Nomex does not perform well due to chemical or hydrolytic attack.
Nomex jet pulse filter bags
This is a commonly used fiber for applications in the 135-204°C range. It is produced in both filament and staple fiber form and is available as both woven and felted fabrics. It has excellent thermal stability, shrinking less than 1% at 177°C . The fiber is flame resistant, but when impregnated with combustible dusts, will support combustion that will melt and destroy the fabric. Nomex will begin to hydrolyze at 190°C when the relative humidity is 10% or greater. Hydrolysis changes the normal white or gray fabric to a red-brown color. The presence of acids will catalyze the hydrolysis process. Unacceptably short bag life will result where sulfur oxides (SOx) and moisture are present and frequent dew point excursions occur, such as in coal-fired boilers. Some acid-retardant finishes have been developed for Nomex, but have been found to improve bag life by no more than 50%, leaving most bag life cycles unacceptably short.
Teflon (PTFE) jet pulse filter bags
Teflon® is unique among synthetics in its ability to resist chemical attack across the entire pH range throughout its operating temperature range of 232°C continuous, to 260°C surge. This fluorocarbon fiber is non-adhesive, has zero moisture absorption, and is unaffected by mildew or ultraviolet light. The primary shortcomings of Teflon® are its high cost and relatively poor abrasion resistance. However, the higher cost can often be justified through longer bag life in extremely corrosive atmospheres. Felted Teflon® is also produced in combination with staple glass fibers and marketed by DuPont as Tefaire®. This combination produces some improved filtration and flow characteristics. Applications of Teflon® include coal-fired boilers, waste-to-energy incinerators, carbon black, titanium dioxide, primary and secondary smelting operations, and chemical processing.
Fiberglass jet pulse filter bags
Most fiberglass fabrics are woven from minute 0.0038 mm filaments. Many variations of yarn construction, fabric weaves, and fabric finishes are available. It is also produced in a felted form. Fiberglass has the highest operating temperature range available in conventional fabrics: 260°C continuous, 288°C surge. Above 260°C, the fiberglass itself is not directly damaged, but the finish which provides yarn-to-yarn lubrication begins to vaporize, resulting in accelerated mechanical wear of the glass fibers. Fiberglass is noncombustible, has zero moisture absorption (cannot hydrolyze), has excellent dimensional stability, and has reasonably good strength characteristics. Woven glass fabrics have high tensile strength characteristics but relatively low flex strength, especially in the fill (circumference) direction of the bag, and low abrasion resistance. Care must be taken to minimize flexing and rubbing. Fiberglass fabrics have relatively good resistance to acids, but impurities in the glass fibers are attacked by hydrofluoric, concentrated sulfuric, and hot phosphoric acids. They also have poor resistance to hot solutions of weak alkalies, acid anhydrides, and metallic oxides. For these reasons, glass fabrics should not be operated below the acid dew point. Fiberglass fabrics are used extensively with coal-fired boilers and high temperature metals applications.
P-84 jet pulse filter bags
P-84 is an aromatic polymer fiber produced in felt form only. The unique shape of the fiber produces improved capture efficiency characteristics. This fabric is specified at 260 °C . Composites are available that take advantage of the superior filtration characteristics of P-84 while reducing its cost. Any of the previous felted materials can be combined with P-84 to produce a fabric composite that exhibits the characteristics of both materials.
An important factor for the function and life of the fabric filter is an efficient heat-insulation.To avoid condensation with consequent corrosion and reduced lifetime as well as to avoid uncontrolled heat expansion and deformation, the total surface of the precipitator is insulated are fully with mineral wool from 100 to 200 mm thick.
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