Axial Flow Fans
Axial flow fans have blades that force air to move parallel to the shaft about which the blades rotate. Axial flow fans blow air along the axis of the fan, linearly
These fans produce air flow at low pressure with high air volume. The fan impeller will be in cast aluminium and the casing will be in MS. The impellers are machined and dynamically balanced in our precision dynamic balancing machine. Axial flow fans are available from size Dia. 300 mm to Dia. 1600 mm. Mainly, these fans are available in direct driven option.
Available capacity Range:
- Air volume - 800 to 85000 M3/Hr.
- Total pressure – 5 to 50 mm WC
This type of fan is used in a wide variety of applications, ranging from small cooling fans for electronics to the giant fans used in wind tunnels. Mainly used in exhaust application.
Centrifugal Fans and Blowers
BLOWERS are key components of any air handling equipment, which moves the air by pressurizing the air and thereby creating a pressure difference.
SLV ENTERPRISES Industrial centrifugal blowers are designed for varied applications in the field of air pollution control and ventilation. SLV ENTERPRISES centrifugal blower comprise a range of 16 different model types with air handling capacities of up to 2,50,000 M3 / Hr and pressures up to 2500 mm water column. Special types of blowers to handle higher air volumes and pressures can also be supplied on request. These blowers are normally are MS welded construction, However, they can also be made out of stainless steel or any other workable material to suite the specified applications. The impeller blade profiles are of various types to suite the medium handled and the application as described and illustrated below. The impeller of the centrifugal blower is statically and dynamically balanced prior to assembly.
The wide range of centrifugal fans in class I, II, III and IV are available in
- Backward curved blades
- Stationary inlet guide vanes
- Direct driven fans
- In many configurations
- Special Linings: The blowers can be lined with FRP on the interior to make them corrosion resistant, or painted with heat resistant paint on the interior for high temperature applications.
Accessories: The following accessories are specified with the fan depending on the application
- The shaft mounted on Aluminium cooling disk
- Fan outlet damper
- Fan inlet vane guide unit
- Vibration isolation pads
- Drain plugs to remove condensation
- Common base frame with motor slide rail for v-belt drive
- Belt guard for v-belt drive arrangement
- Shaft guard for v-belt drive arrangement
- Motor cover
- Air intake louver (Fresh air / once through System)
- Return air mixing box (Recycling system)
- Strip Heaters bank
- Pre filter bank (10 micron)
- Cooling coil / Cooling pad
- Fine filter bank (5 micron)
- Super fine / HEPA filter bank (0.3 micron)
- Wood industries
- Flour mills
- Pneumatic conveyors
- Coir mattress
- Fiber glass
- Buffing & Polishing
- Boilers and furnaces exhaust
- Bulk drugs
- Manual shaking mechanism's
- Filter bag will hang on a cradle, which will be shaked by manually rotating the lever. Vibration will be created by cam mechanism or spring force.
- Mechanical shaking mechanism's
- Filter bag will hang on a cradle and it will be shaked by vibrator / Motorized shaking mechanism.
- Automatic Reverse pulse jet Mechanism
- Filter bag will be cleaned by compressed air, blowing in opposite direction of dust air flow
- Non woven filter fabric bags or high efficiency filter cartridges
- Strong raw gas chamber in steel
- Clean air/gas chamber mounted immediately on top of raw gas chamber.
- Air Jet manifolds is connected to a compressed air tank and solenoid valve assemblies complete with solenoid valves and electronic sequential timers.
- Inspection cover/doors, hand rails and cat ladder.
- Easy accessibility to all the components.
- Inspection and maintenance of filter bags can be carried out entirely from the clean airside.
- Space saving due to high air to cloth ratio.
- High filtration efficiency limiting emission level.
- Low compressed air consumption combined with high cleaning efficiency.
- High reliability of service since only a few components of simple design are involved.
- Maintenance free operation
- LEVs / Suction hood
- Ducting
- Packed bed scrubber / Plate scrubber / Venturi scrubber
- Pump to handle scrubbing liquid
- Blowers
- Chimney
- To ensure the operators health and safety by removing the hazardous fumes from the working area
- To avoid pollution problems
- Sturdy construction
- To increase the product quality removing fumes from the process
- LEVs / Suction hood
- Ducting
- Packed bed scrubber / Plate scrubber / Venturi scrubber
- Pump to handle scrubbing liquid
- Blowers
- Chimney
- Contaminant flow composition
- Contaminant solubility
- Chemistry that will react with contaminants
- Reaction speed
- HTU (height transfer unit) factors required for specified removal efficiency
- Liquid-to-gas ratio
- Velocity
- Performance
- Particulate matter (PM)
- Hazardous air pollutant in Particulate matter
- Inorganic fumes / vapours / gases
- Can handle flammable and explosive dusts with little risk
- Provides Gas absorption and dust collection in a single unit
- Can handle mists
- Collection efficiency can be varied
- Provides cooling for hot gasses
- Corrosive gases and dusts can be neutralized
- Improves gas-slurry contact for SO2 removal
Double Skin and Single Skin Air Handling Units
Air Handling Unit is a cabinet (plenum) type unit to be used in Industrial Air Handling System / HVAC System with suitable selected internals based on the application in combination of blower, pre filters, cooling coil / cooling pad, fine filters, return air mixing box, air intake louvers
SLV ENTERPRISES offer Air Handling Unit in both options Single skin Construction and Double skin construction. Single skin constructed AHUs are to be used in Fresh air Ventilation System. Single skin constructed AHUs are built by using heavier gauge sheets (18 / 20 SWG Galvanized sheet).
Double skin AHUs are constructed by using PUF insulated panels. The panel outer skin may be with 20/22 SWG GI sheet and the panel inner skin may be with 24 SWG GI sheet. PUF slabs will be used as core insulation of AHU panels. The thickness of panel may be 25 / 40 / 50 mm. Thickness of panel will be decided with application and size of the AHU. The main frame work shall be with imported, extruded aluminum profiles. All sections are provided with hinge type access doors with handle & locking systems for easy access for maintenance.
The blower section will have DIDW blower with backward / forward curve impeller mounted on a common base frame with drive motor. The blower may be direct drive / v-belt drive arrangement. Anti vibration mounting below the common base frame and outlet canvass connection at blower outlet will be provided to isolate the vibration of blower.
AHUs will have other suitable selected internals based on the application in combination of the following:
Generally, Air Handling Units are classified as floor mounting and ceiling mounting based on the mounting arrangement. Available to suit to the application and to suit to the designed flow rate and static pressure as custom built. The cooling coil will be designed either Direct expansion / chilled water duty conditions based on the requirement.
Based on your requirement, we can include instrumentations for monitoring and control the system performance and safety point of view like magnehelic gauges to measure pressure difference across the filters, limit switches on inspection door of AHU etc.
Cyclone Separators
Cyclonic separation is a method of removing particulates from an air stream, without the use of filters, through vortex separation. Rotational effects and gravity are used to separate particle from the dust laden air.
Cyclone body will be cylindrical in the top portion and conical shape at the bottom as shown in the drawing. The air stream will enter into the cyclone body tangentially in the top cylindrical with high velocity. The top portion of the cyclone body guides the air to move in circular pat in high velocity. A cyclonic effect (twister) will be created inside the body and the air stream move downwards in the heavier dust particles in helical pattern. The heavier particles in the air stream have too much inertia, while moving in cyclonic effect and move towards outer peripheral of the cyclonic effect in the air stream. When the particles are striking the inner surface of the cyclonic body, it will lose its momentum and fall down. In a conical system, as the rotating flow moves towards the narrow end of the cyclone, the rotational radius of the stream is reduced, thus separating smaller and smaller particles.
Cyclone is called as pre collector in the dust extraction system. Cyclone has good efficiency in dust separation for large size particles and fiber dust particles. Cyclone separator will be used to segregation of items or products in the conveying systems. Cyclone separator MOC will be defined by the application and nature of dust to be handled.
Cyclone separators widely used in
Bag Filters
Fabric filter bags are used to separate particle from the dust laden air in bag filter unit. They are one of the most efficient and cost effective types of dust collectors available and can achieve a collection efficiency of more than 99% for very fine particulates
Dust-laden gases enter the bag filter unit and pass through fabric bags that act as filters. The bags can be of woven or felted cotton, synthetic, or glass-fiber material in either a tube or envelope shape.
The high efficiency of these collectors is due to the dust cake formed on the surfaces of the bags. The fabric primarily provides a surface on which dust particulates collect through the following four mechanisms:
Inertial collection - Dust particles strike the fibers placed perpendicular to the gas-flow direction instead of changing direction with the gas stream. Interception - Particles that do not cross the fluid streamlines come in contact with fibers because of the fiber size.
Brownian movement – Sub micrometre particles are diffused, increasing the probability of contact between the particles and collecting surfaces. Electrostatic forces - The presence of an electrostatic charge on the particles and the filter can increase dust capture.
A combination of these mechanisms results in formation of the dust cake on the filter, which eventually increases the resistance to gas flow. The filter must be cleaned periodically.
SLV ENTERPRISES offer bag filter unit in three options. Options are varying with the cleaning mechanism of the bag filter unit.
AUTOMATIC REVERSE PULSE JET BAG FILTER UNIT
In reverse-pulse-jet bag filter unit, individual filter bags are supported by a metal cage / spring, which are fastened onto a holding plate at the top of the bag filter unit which separates the unit into two parts as dust chamber and clean air chamber. Dirty gas enters from the bottom of the bag filter unit and flows upwards through the filter bags. The metal cage prevents collapse of the bag. Dust particles filtered and settled at the outer peripheral of the filter tube.
Bags are cleaned by a reverse jet of compressed air, injected through nozzle just above the bag holding plate nearer to filter bags. A venturi nozzle provided at the filter bag opening accelerates the compressed air. Since the duration of compressed air jet short time, the filter tube become balloon for short time. This expansion of filter bag for short time of remove the dust cake formation and the dislodged dust falls into a storage hopper below. Reverse-pulse-jet dust collectors can be operated continuously and cleaned without interruption of flow because the burst of compressed air is very small compared with the total volume of dusty air through the collector. Also, the continuous-cleaning feature allows them to operate at higher air-to-cloth ratios, so the space requirements are lower.
This cleaning mechanism works with the help of digital sequential timer attached to the fabric filter. This timer indicates the solenoid valve to inject the air to the blow pipe.
Automatic Reverse Pulse Jet Bag filter unit, generally have the following parts:
Special features of the Pulse Jet Bag Filter.
Unitary Dust Collectors
Recovery of particulate matter from exhaust gas is vital for any industry from three aspect
To ensure the operators health and safety by removing the hazardous fumes from the working area To avoid pollution problems Sturdy construction To increase the product quality removing fumes from the process
Dust collection systems is used in many processes to either recover valuable granular solid or powder from process streams, or to remove granular solid pollutants from exhaust gases prior to venting to the atmosphere. Dust collection is an online process for collecting any process-generated dust from the source point on a continuous basis. Dust collectors may be of single unit construction, or a collection of devices used to separate particulate matter from the process air. They are often used as an air pollution control device to maintain or improve air quality.
The dust generation in manufacturing process directly effects the operator’s health, can contaminate the product which is being manufacturing can make highly uncomfortable for the people in & around the dust generating areas. SLV ENTERPRISES wish to offer a solution by incorporating dust control & extraction system & ensure a safe & pure zone for the occupants. This process involves exhaust blowers, exhaust air duct work and dust collection hoods to pick up dust particles at the point of generation. In several cases, the dust collected by the system from the point of generation is routed through a filter unit which collects the dust & pure air will be exhausted to the ambient to meet pollution control.
Fume scrubbing / Extraction system comprises of following
Wet Collectors
Recovery of particulate matter from exhaust gas is vital for any industry from three aspect
Dust collection systems is used in many processes to either recover valuable granular solid or powder from process streams, or to remove granular solid pollutants from exhaust gases prior to venting to the atmosphere. Dust collection is an online process for collecting any process-generated dust from the source point on a continuous basis. Dust collectors may be of single unit construction, or a collection of devices used to separate particulate matter from the process air. They are often used as an air pollution control device to maintain or improve air quality.
The dust generation in manufacturing process directly effects the operator’s health, can contaminate the product which is being manufacturing can make highly uncomfortable for the people in & around the dust generating areas. SLV ENTERPRISES wish to offer a solution by incorporating dust control & extraction system & ensure a safe & pure zone for the occupants. This process involves exhaust blowers, exhaust air duct work and dust collection hoods to pick up dust particles at the point of generation. In several cases, the dust collected by the system from the point of generation is routed through a filter unit which collects the dust & pure air will be exhausted to the ambient to meet pollution control.
Fume scrubbing / Extraction system comprises of following
Packed Bed Scrubber
SLV ENTERPRISES packed bed scrubbers are versatile, reliable systems that serve the widest variety of processes. SLV ENTERPRISES packed scrubbers are highly recommended for the efficient removal of inorganic gases, odors and fumes, and are particularly appropriate where gas streams have extreme pH. They are well suited for use as primary or secondary systems in conjunction with thermal oxidizers, and are also used in a series where there are multiple-contaminant gas streams.
There are four broad categories of information, which influence the design of these systems.
Air flow through the scrubber, based on cubic meter/hr. This is determined by the process to be handled by the scrubber, through information provided by customer and SLV ENTERPRISES analysis.
Configuration
Internal vs. external re-circulation system, fan location in relation to tower, duct sizes, inlet and outlet plus location of pump systems, tower access service ports, service platform requirement.
Materials of Construction
Determined by application; because most contaminants involve corrosive gases and fumes, material must be able to withstand continuous contact with high and low pH gases and scrubbing solutions. Standard construction materials include: polypropylene, fiberglass and PVC. Optional materials include high alloy metals such as stainless, also dual-laminate structures incorporating FRP over PVC, PP is available.
Operational Efficiency
Removal efficiency of scrubber: inlet vs. outlet requirement, based on mass emission in lbs/hr. in vs. lbs/hr. out.
Factors to consider in calculating removal efficiency are: Producing a Practical System Design
Using the information gathered under the efficiency requirement section above, and other factors specific to the site, SLV ENTERPRISES engineers determine the optimum tower diameter, packing depth, re-circulation flow rate, and mist eliminator requirement in microns.
Inlet vs. Outlet
It is critical, when calculating the efficiency of a scrubber, to know the inlet load of the contaminant being removed. This data should be provided to SLV ENTERPRISES in the form of a mass emission number, relating to lbs per hour of contaminant to be removed. SLV ENTERPRISES engineers will use of HTU (height transfer unit) and NTU factors to calculate the necessary packing depth. Also using this inlet load information, Engineering will calculate the liquid-to-gas ratio for optimum pump sizing for re-circulation rates. SLV ENTERPRISES use conservative calculations in the design of systems to assure reliable, long-term performance under a wide range of operating conditions. Many competitive systems are designed to operate with velocities more than 20% higher than a SLV ENTERPRISES system, and re-circulation flow rates less than 50%. Use of these under-sized systems on industrial applications often results in failure to meet operating permit requirements. For the system owner, this means the choice will be to significantly modify, or replace, the equipment. SLV ENTERPRISES conservative engineering approach serves our customers predictably and well, because systems meet stack efficiency and other operational requirements from the first day they're on-line.
Packing
The standard random dump section of the wet scrubber system incorporates ultra high efficiency SLV ENTERPRISES tower packing. Using PVC rasgic rings/balls will do packing bed. Scrubbing agent will be sprayed above the packing bed. This will create scrubbing surface on the packing bed and when the fume/gas passing through the bed scrubbing action will take place.
Mist Eliminator Efficiency
Mist eliminator systems are available in rigid chevron blade style and/or layered pad designs. Selection depends on the efficiency required and scrubber size. Typical mist eliminator efficiencies are based on 99%on 15 micron size droplets. Lower or higher efficiency rates are possible and will be recommended by SLV ENTERPRISES engineering, where applicable.
Pumps
Pumps for the scrubber systems are offered in two categories: 1. ANSI horizontal units 2. Vertical submerged head units The scrubbing agent will be re-circulated from the internal sump to the spray header.
Exhaust Blowers
In the SLV ENTERPRISES standard design, materials of construction include Mild steel with rubber / FRP lining, polypropylene with FRP lining. The impeller design is backwardly inclined, flat blade (or air foil wheel). Wheels are available in Class 2, 3 or 4 categories, depending on pressure requirements. Materials of construction for fan impellers are mild steel with FRP coating, and stainless steel. Vibration isolation is available for the inlet and outlet duct and also for the fan base. The fan discharge orientation depends on stack requirements and fan position.
Plate Scrubber Unit
Removal of air pollutants by inertial or diffusion impaction, reaction with a sorbent or reagent slurry or absorption into liquid solvent
SLV ENTERPRISES offer single or multi stage plate scrubber in SS / PP + FRP construction.
An impingement-plate scrubber is a vertical chamber with plates mounted horizontally inside a hollow shell. Impingement-plate scrubbers operate as countercurrent particulate matter (PM) collection devices. The scrubbing liquid flows down the tower while the gas stream flows upward. Contact between the liquid and the particle-laden gas occur on the plates. The plates are equipped with openings that allow the gas to pass through. Some plates are perforated or slotted.
The simplest impingement-plate scrubber is the sieve plate, which has round perforations. In this type of scrubber, the scrubbing liquid flows over the plates and the gas flows up through the holes. The gas velocity prevents the liquid from flowing down through the perforations. Gas-liquid-particle contact is achieved within the froth generated by the gas passing through the liquid layer. Complex plates, such as baffle plates, introduce an additional means of collecting PM. The baffles placed above the plate perforations force the gas to turn before escaping the layer of liquid. While the gas turns to avoid the obstacles, most PM cannot and is collected by impaction on the baffles.
In all types of impingement-plate scrubbers, the scrubbing liquid flows across each plate and down the inside of the tower onto the plate below. After the bottom plate, the liquid and collected PM flow out of the bottom of the tower. Impingement-plate scrubbers are usually designed to provide operator access to each tray, making them relatively easy to clean and maintain. SLV ENTERPRISES make Impingement plate scrubbers are easy to clean and maintain and are not subject to fouling as packed bed wet scrubbers are, hence they are most suited to PM control and there are no practical limits to inlet PM concentrations. Particles greater than 1 µm in aerodynamic diameter can be collected effectively by impingement-plate scrubbers
Water is the most common solvent used to remove inorganic contaminants, though as caustic for is used for acid-gas absorption. Since the absorption as the primary controltechnique, the spent solvent can be easily regenerated or disposed of in an environmentally acceptable manner.