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SENOTAY FILTRATION EQUIPMENT — PULSE JET BAG FILTER RANGE
The Senotay Single Pulse Bag Filter is a self-contained, pulse-jet cleaned fabric filtration unit designed for localised dust capture at industrial point sources — including silo and bin tops, conveyor belt transfer points, crusher and screen venting, bagging stations, and other fixed dust-generating equipment. Compact, reliable, and capable of up to 99.9% filtration efficiency, it is the standard solution for in-place dust recovery across a wide range of industries.
KEY PERFORMANCE DATA
Up to 99.9% Filtration Efficiency | 500 – 50,000 m³/h Capacity Range | Ambient – 280°C+ Operating Temperature | On-Line Continuous Pulse Cleaning |
PRODUCT OVERVIEW
The Single Pulse Bag Filter is a compact, self-contained dust collection unit that combines a fabric filter system and a pulse-jet cleaning mechanism in one housing. Unlike large centralised baghouse systems that collect dust from multiple points via extensive ductwork networks, the Single Pulse Bag Filter is designed to be installed directly at or very close to the dust source — mounted on a silo top, suspended above a conveyor transfer point, or positioned beside a processing machine.
This point-of-source approach offers several important advantages: shorter duct runs reduce system pressure drop and fan energy consumption; dust is recovered directly at the source, minimising handling losses; and multiple individual units can serve multiple dust points without a centralised ductwork infrastructure. For facilities with several separated dust sources at relatively low individual volumes, a network of Single Pulse Bag Filters is often more practical and cost-effective than a single large centralised system.
The unit is particularly well-suited to applications where the collected dust has product value — grain, flour, cement, chemical powders — because the recovered dust falls directly back into the process vessel (silo, bin, or hopper) rather than into a waste stream. This direct-recovery configuration is one of the defining characteristics of the Single Pulse Bag Filter application.
HOW IT WORKS
The Single Pulse Bag Filter operates on a continuous cycle of filtration and automated cleaning. Understanding this cycle is important for correct setup, commissioning, and performance monitoring.
Dust-laden gas enters the filter housing through the inlet — typically at the base of the unit for silo-top applications, or through a side inlet duct for standalone installations. As the gas rises through the housing, it passes through the outer surface of the fabric filter bags. Particulate matter is captured on the outside of the bag fabric, and clean gas passes through the fabric and exits upward through the clean-air plenum and outlet. For silo-top units, a small integral fan draws the gas through the filter and exhausts the cleaned air to atmosphere.
As filtration continues, dust accumulates on the outer bag surface and forms what is called a "dust cake." In the early stages of operation, the dust cake actually improves filtration efficiency by acting as an additional filter layer. However, as the cake builds up, the resistance to gas flow (differential pressure) across the bags increases. Left uncleaned, the resistance would eventually rise to a level that significantly reduces gas throughput — so the cleaning system periodically removes the accumulated dust cake.
The pulse-jet cleaning system operates automatically and continuously while the filter is in normal service — there is no need to take the unit offline for cleaning. The pulse controller sequences through each row of filter bags in turn, opening the corresponding solenoid valve for a very brief period (typically 0.10–0.15 seconds). This releases a high-pressure burst of compressed air through the blowpipe and venturi nozzle directly into the top of each bag in that row.
The compressed air pulse creates a momentary reverse flow through the bag fabric and causes the bag to flex sharply outward. This rapid flexing breaks the bond between the dust cake and the bag surface, dislodging the accumulated dust. The dislodged dust falls under gravity through the filter chamber and into the hopper below. From the hopper, it is discharged through the rotary unloader or discharge valve — either back into the process vessel (for direct-recovery silo-top applications) or into a conveying system for disposal or reuse.
After the pulse, the bag immediately returns to its filtration function. Because only one row of bags is being cleaned at any given moment — while all other rows continue filtering — the process is truly continuous. There is no interruption to gas throughput during cleaning, and no requirement to stop the associated process.
The performance of a pulse bag filter is most easily monitored through the differential pressure (ΔP) across the filter bags — the pressure difference between the dirty-gas inlet side and the clean-gas outlet side. A correctly operating unit will show a stable ΔP within the design range (typically 800–1,500 Pa), with small cyclic fluctuations as each row is cleaned. A persistently rising ΔP indicates that cleaning is not keeping pace with dust accumulation — a sign that the pulse settings need adjustment, the compressed air supply is inadequate, or the bags are approaching end of service life.
CONSTRUCTION & COMPONENTS
The table below describes every major component of the Single Pulse Bag Filter — what it does, and how it is constructed. Understanding these components helps operators identify, maintain, and replace them correctly.
Component | Function | Construction Detail |
Clean-Air Upper Plenum | Houses the pulse-jet cleaning system and provides the clean-gas outlet path | Contains the compressed air reservoir pipe, pulse valve manifold, blowpipe assembly with venturi nozzles, and solenoid valve wiring. Fitted with the clean-gas outlet flange and a liftable or bolted top cover to allow bag installation and internal inspection from above. The pulse controller enclosure is mounted externally on or adjacent to this section. |
Perforated Tube Sheet | Structural partition separating the dirty-gas filter chamber from the clean-air plenum | Precision-punched steel plate with apertures sized to accept the bag collar and cage assembly. The tube sheet is the critical sealing interface — each bag collar must snap firmly into its aperture to prevent unfiltered gas bypassing the bags. Tube sheet flatness and aperture dimensions are checked dimensionally after fabrication. |
Filter Bags | The primary filtration media — captures particulate matter on the outer bag surface | Fabric filter bags in woven or felted construction, selected for the specific dust type and gas temperature. Material options from polyester (to 130°C) through to PTFE-laminated fibreglass (to 280°C+). Anti-static variants incorporate conductive fibres to dissipate charge. Bag dimensions (diameter and length) are matched to the tube sheet aperture spacing and unit height. |
Bag Cages (Support Frames) | Internal wire frame that supports the filter bag in its extended, cylindrical shape during filtration | Formed from mild steel wire rod, welded at intersections to a rigid cage structure. Cage dimensions are matched to bag dimensions with a defined clearance — too tight damages the bag; too loose causes the bag to collapse. Cages are inspected for bent wires, broken welds, and sharp edges before assembly. Galvanised or stainless steel cages available for corrosive environments. |
Filter Chamber Housing | Sealed enclosure containing the dirty-gas inlet, filter bags, and lower hopper | Fabricated from steel plate to calculated wall thickness. Fitted with gas inlet (bottom or side entry), side access doors for bag inspection and replacement, and connecting flanges to the upper plenum and lower hopper. Internal surfaces are smooth-finished to prevent dust accumulation. Access door seals are checked for airtightness before despatch. |
Dust Hopper | Collects dislodged dust that falls from the bags during the pulse cleaning cycle | Pyramid or vee-shaped hopper fabricated below the filter chamber. Hopper slope angle calculated for the specific dust's angle of repose to ensure free gravity flow to the discharge point. For cohesive or hygroscopic dusts: hopper heaters and/or vibrators specified to prevent bridging. Fitted with the discharge valve and an inspection access point. |
Pulse-Jet Cleaning System | Automatically and continuously removes accumulated dust from filter bags during normal operation | Comprises: compressed air reservoir pipe (maintains air volume for pulse delivery), solenoid pulse valves (one per row of bags, wired to the pulse controller), blowpipe manifold (distributes compressed air above each bag row), and venturi nozzles (amplify and direct the compressed air pulse into the top of each bag). Operates on-line — cleaning proceeds row by row while filtration continues on all other rows. |
Pulse Controller | Electronic timer that sequences the solenoid valves and controls cleaning frequency and intensity | Programmable controller with adjustable pulse duration (length of each valve opening) and pulse interval (time between row cleanings). Can operate in time-trigger mode (fixed interval) or differential-pressure-trigger mode (cleaning activates when ΔP rises above a set threshold). Mounted in a weatherproof enclosure; indicator lights show active valve channels and fault conditions. |
Discharge Valve (Rotary Unloader) | Controlled discharge of collected dust from the hopper into downstream conveying equipment | Star-shaped rotary valve (standard) provides a continuous, metered discharge while maintaining an airtight seal between the hopper and atmospheric pressure. Prevents false air ingress through the discharge point, which would disturb hopper airflow and cause dust re-entrainment. Alternative discharge options: slide gate (for batch discharge), double-flap valve (for high-pressure differential applications), or direct screw conveyor connection. |
TECHNICAL SPECIFICATIONS
All specifications below apply to Senotay Single Pulse Bag Filter units. Values are for standard configurations — specific parameters for your order are confirmed in the technical proposal and recorded on the equipment nameplate.
Parameter | Specification |
Filtration Efficiency | Up to 99.9% particulate capture; outlet concentrations <30 mg/m³ standard, <10 mg/m³ with PTFE membrane bags |
Capacity Range | 500 m³/h (small single-unit) to 50,000 m³/h per module; multi-module parallel configurations for larger volumes |
Operating Temperature | Up to 130°C (polyester bags); up to 200°C (Nomex/PPS bags); up to 280°C+ (fibreglass/PTFE bags) |
Inlet Dust Concentration | Designed for up to 30 g/m³; cyclone pre-separator recommended above 15–20 g/m³ for extended bag life |
Air-to-Cloth Ratio | 0.8–1.5 m/min (m³/m²·min) for standard applications; 0.5–0.9 m/min for fine, sticky, or high-concentration dust |
Filter Bag Dimensions | Diameter: 100–160 mm typical; Length: 1,500–6,000 mm depending on unit size and capacity |
Compressed Air Pressure | 0.5–0.7 MPa (5–7 bar) clean, dry, oil-free compressed air at the filter manifold |
Compressed Air Consumption | Typically 0.1–0.3 m³/min per 1,000 m³/h filtered gas (varies with pulse frequency and bag count) |
Pulse Duration | Adjustable 0.05–0.5 seconds per valve actuation; factory set to 0.10–0.15 s for most applications |
Pulse Interval | Adjustable 1–60 seconds between row cleanings; factory set to 10–15 s; adjusted based on operating ΔP |
Differential Pressure (Design) | Operating range typically 800–1,500 Pa; unit sized to maintain ΔP within this range under specified cleaning frequency |
Housing Material | Standard: Q235B carbon steel, shot-blasted, primed, and powder-coated. Options: stainless steel 304/316L, weathering steel, specialist alloys |
Hopper Geometry | Steep-sided hopper (60° min) for standard industrial dust; shallower angles for free-flowing powders; hopper vibrators available for cohesive dust |
Discharge Device | Star-shaped rotary unloader (standard); slide gate; double-flap valve; screw conveyor connection — specified at time of order |
Cleaning System Type | Pulse-jet (on-line continuous cleaning) — filter operates at full capacity throughout the cleaning cycle. No offline cleaning required. |
Control System | Programmable pulse controller with adjustable timing; differential pressure-triggered or time-triggered cleaning modes; manual override |
Access & Maintenance | Side-mounted hinged or bolted access doors on filter chamber; liftable or bolted top cover on clean-air plenum for bag installation/removal |
Surface Treatment | Shot-blast Sa 2.5; anti-rust primer coat; industrial powder coat or enamel topcoat; dry film thickness recorded per unit |
Structural Standard | Designed and fabricated to Chinese national standards (GB). CE documentation available on request for export markets. |
Customisation | Non-standard dimensions, explosion relief panels, insulated housings, stainless internals, divided chambers, integrated frames — all available |
PRODUCT VARIANTS
The Single Pulse Bag Filter is available in several variants to match different operating conditions, dust types, and installation requirements. The table below describes each variant, its key specification differences, and the applications it is best suited to.
Variant | Key Specification | Primary Applications |
Standard Single Pulse Bag Filter | Ambient to 130°C; standard polyester bags; carbon steel housing with powder coat finish | General industrial dust at moderate temperatures: grain handling, aggregate, plastics, general manufacturing |
High-Temperature Pulse Bag Filter | 130°C to 280°C+; Nomex, PPS, fibreglass, or PTFE bags; insulated housing option; high-temp pulse valve components | Cement kilns, boiler flue gas, asphalt drum dryers, metallurgical fume, incinerator exhaust |
Anti-Static Pulse Bag Filter | Conductive filter bag fabric (carbon fibre or stainless steel yarns woven in); earthed housing; explosion relief panels available | Combustible and potentially explosive dust: grain flour, wood dust, chemical powder, rubber dust, coal dust |
Long-Bag Pulse Filter | Extended bag length (up to 6,000 mm); reduced plan footprint for given gas volume; requires higher minimum compressed air volume | Where site footprint is constrained but gas volume is large; tall building or silo top installations |
Side-Entry / Low-Profile Pulse Filter | Inlet and outlet positioned for restricted headroom or retrofit applications; gas enters and exits from the side of the housing | Replacing existing equipment in confined plant areas; retrofitting dust control to existing process equipment |
Stainless Steel Pulse Bag Filter | SS304 or SS316L construction for housing, hopper, and tube sheet; matched with acid-resistant or PTFE bag media | Pharmaceutical manufacturing, food and beverage, fine chemical, hygroscopic or corrosive dust environments |
Compact / Silo-Top Single Unit | Self-contained unit designed to mount directly on silo top, bin, or conveyor transfer point; integrated fan; direct-recovery hopper | Silo and bin venting; conveyor belt transfers; local dust source capture at storage, filling, or discharge points — the direct focus of this page |
INDUSTRY APPLICATIONS
The compact, self-contained design of the Single Pulse Bag Filter makes it the product of choice for point-source dust capture across a wide range of industries and installation types. The table below maps the most common applications to dust types and installation notes.
Application | Typical Dust Types | Installation & Application Notes |
Silo & Bin Venting | Grain, cement, flour, mineral powder | Unit mounts directly on silo top flange. Captures displaced air during filling. Recovered dust falls directly back into silo — zero product loss. |
Conveyor Belt Transfer Points | Coal, aggregate, grain, cement, fertiliser | Captures dust at chute-to-belt and belt-to-chute transfer points. Compact footprint; can be floor-mounted or suspended above transfer enclosure. |
Crusher & Screen Venting | Stone, coal, mineral ore, glass cullet | Handles coarse, abrasive dust from crushing and screening operations. Cyclone pre-separation recommended for very high inlet concentrations. |
Bucket Elevator Venting | Grain, flour, pellets, powder | Mounted at elevator head to vent displaced air during loading. Anti-static variant required for combustible grain and flour dust. |
Mixer & Blender Venting | Chemical powder, food ingredients, feed | Captures dust generated during batch mixing and blending cycles. Can be interlocked with mixer operation for on-demand cleaning. |
Bagging & Filling Stations | Cement, flour, chemical, agricultural | Captures fugitive dust at bag-filling, pallet-stacking, and product transfer points. Compact unit for installation close to filling head. |
Foundry & Casting | Sand dust, metallic fume, binder smoke | Handles mixed-particle dust from moulding and shakeout. High-temperature variant for operations close to pouring areas. |
Pharmaceutical Dispensing | API dust, excipient powder | Stainless steel GMP variant for dispensing booth dust capture. Full clean-in-place compatibility; smooth internal finish; HEPA-grade filter media option. |
Wood & Panel Manufacturing | Sawdust, MDF fibre, sanding dust | Anti-static variant with explosion relief for combustible wood dust. Can be integrated with local extraction hoods at sanding and routing stations. |
Mining & Quarrying | Rock dust, mineral fines, overburden | Robust outdoor construction for exposed installations. Cyclone pre-separation for very high dust loadings at crush and screen stations. |
PRODUCT ADVANTAGES
• Up to 99.9% filtration efficiency — suitable for compliance with strict environmental emission limits and workplace air quality standards
• Continuous on-line cleaning — pulse-jet cleaning operates during normal service with no production interruption
• Compact, self-contained design — no separate fan room, control room, or extensive ductwork required for point-source applications
• Direct product recovery — silo-top and bin-top configurations return collected dust directly to the process vessel, eliminating product loss
• Low compressed air consumption — efficient venturi-amplified pulse system uses minimal compressed air compared to reverse-flow cleaning alternatives
• Wide operating temperature range — filter bag media options cover ambient to 280°C+ for the broadest range of process conditions
• Anti-static and explosion-relief variants — full compliance with combustible dust safety requirements
• Stainless steel GMP variants — cleanroom-compatible construction for pharmaceutical and food-grade applications
• Minimal maintenance — automated cleaning reduces manual intervention; bag replacement via top-access cover is straightforward
• Long filter bag service life — correct bag selection and gentle pulse cleaning extend bag intervals, typically 2–4+ years under normal conditions
• Fully customisable — non-standard dimensions, special materials, divided chambers, and integrated structural features available to order
SPECIFICATION GUIDE
Use the selection guide below to identify the correct specification for your application. Match your key operating conditions to the recommended specification — or contact our engineering team for a full application assessment if you have conditions that fall outside these guidelines.
Selection Factor | Your Condition | Recommended Specification |
Dust type | Standard dry, non-hygroscopic powder | Standard single pulse bag filter — polyester bags |
Dust type | Combustible / potentially explosive | Anti-static variant with explosion relief panels — mandatory for Kst > 0 |
Dust type | Hygroscopic or moisture-sensitive | Heated hopper + insulated housing; consider wet collector for very hygroscopic material |
Dust type | Corrosive (acid or alkali gas present) | PPS or PTFE bags; stainless steel housing internals |
Gas temperature | Below 130°C | Polyester filter bags (standard) |
Gas temperature | 130–200°C | Nomex (meta-aramid) or PPS filter bags |
Gas temperature | 200–280°C+ | Fibreglass or PTFE-laminated fibreglass filter bags |
Inlet concentration | Below 15 g/m³ | Direct to single pulse bag filter |
Inlet concentration | Above 15–20 g/m³ | Cyclone pre-separator + pulse bag filter in series |
Outlet requirement | < 50 mg/m³ | Standard polyester or Nomex bags |
Outlet requirement | < 10 mg/m³ | PTFE membrane laminate bags (surface filtration) |
Installation type | Silo/bin top — direct product recovery | Compact silo-top single unit with direct-recovery hopper |
Installation type | Ground-level — ducted collection from source | Standard floor-mounted single pulse bag filter with ducted inlet |
Footprint | Very limited site space | Long-bag variant — reduced plan area for given gas volume |
Headroom | Limited height available | Side-entry / low-profile variant with horizontal gas flow |
HOW TO ORDER
To receive an accurate quotation, provide the following information. You do not need all of it — share what you have and our engineers will ask for anything else needed.
• Application type — silo/bin top, conveyor transfer, process venting, or other point source
• Dust type — material being handled or processed
• Gas or air volume in m³/h — total volume to be filtered at the specific dust point
• Gas temperature in °C — maximum continuous temperature at the filter inlet
• Required outlet emission limit in mg/m³ — if known
• Any special conditions — combustible dust (provide Kst if known), corrosive gases, moisture, space constraints
• Installation type — silo/bin top flange dimensions (for direct-mount units) or ducted inlet/outlet (for standalone floor-mounted units)
• Delivery location — country and nearest port for export orders
Send your enquiry to info@senotay.com or WhatsApp +8615831871808. Our engineering team will respond with preliminary recommendations within 24 hours and a formal technical and commercial quotation within 48–72 hours.
For replacement filter bags, bag cages, solenoid valves, or other spare parts for an existing unit, simply provide the equipment model number from the nameplate and the part description. We will confirm the correct specification and lead time within 24 hours.
SENOTAY QUALITY PROMISE
Every Single Pulse Bag Filter we supply is designed for your specific application, fabricated in our own Botou production facility, and subjected to pre-shipment testing — including housing air-pressure testing, pulse valve cycling under rated compressed air pressure, and functional verification — before it leaves our factory. The equipment is supplied with a complete documentation package including installation drawings, operation and maintenance manual, pulse controller programming guide, parts list, and quality inspection certificate.
"A dust collector that performs from day one and keeps performing for years — that is what we build. Not the cheapest option, but the right one."
— Senotay Engineering Team
GET A QUOTATION
Whether you need a single unit for a silo top or a batch of collectors for a new processing line, our team is ready to help. Contact us with your application details and we will respond with a recommendation and quotation promptly.
• Email: info@senotay.com
• Phone: +86-158-318-71808
• WhatsApp: +86-158-318-71808 / +8615831871808
• Address: Botou Industrial Development Zone, Cangzhou City, Hebei Province, China