Pollution Control Equipment Manufacturer
If your plant is facing CPCB inspection, NGT compliance pressure, or repeated SPM exceedances in stack testing, the first question is not which product to buy. It is whether your current emission control system matches your actual operating conditions.
AS Engineers designs and manufactures bag filters, cyclone separators, and industrial scrubbers for industrial plants across India. Each system is built to specific gas volume, particle load, temperature, and chemical composition requirements. The equipment is not selected from a catalogue. It is engineered to the application. ISO 9001:2015 certified. Manufactured in Ahmedabad, Gujarat.
Why Plants Need Pollution Control Equipment
India’s CPCB emission standards set maximum permissible concentrations for particulate matter (SPM), sulphur dioxide, and nitrogen oxides across most process industries. The NGT has progressively tightened enforcement timelines, particularly for cement, fertilizer, chemical, and thermal power plants. Non-compliance leads to SPCBs issuing show-cause notices, direction for closure, and financial penalties.
Selecting the right pollution control equipment is a compliance engineering decision, not just a procurement activity. The wrong equipment type results in systems that pass at commissioning and fail under actual operating loads.
Our Pollution Control Equipment Range
AS Engineers manufactures three categories of emission control equipment. For high-dust-load applications, a cyclone separator is typically installed upstream as a primary collector, followed by a bag filter as a secondary collector. For gas streams carrying soluble fumes, acid vapour, or high-humidity particulates, an industrial scrubber handles what dry filters cannot.
All three systems can be supplied as a standalone unit or as part of an integrated emission control system, including the centrifugal blowers that move the gas stream through the system.
Bag Filters (Fabric Filters)
A bag filter uses woven or non-woven filter fabric to separate particulate matter from a gas or air stream. Dust-laden gas enters the filter housing, passes through the filter bags, and exits as cleaned gas. The captured dust accumulates on the bag surface and is periodically cleaned by pulse-jet or shaker mechanism, then collected in a discharge hopper.
Collection efficiency exceeds 99% for particles above 5 microns when the fabric is correctly selected for particle type, temperature, and moisture content. Bag filters meet CPCB SPM emission limits for most industrial processes when sized and operated to design parameters.
AS Engineers manufactures bag filters in mild steel, SS 304, and SS 316 construction. Temperature ratings, bag fabric type, cleaning mechanism, and housing configuration are specified per application.
Cyclone Separators
A cyclone separator uses centrifugal force to separate particulate matter from a gas stream. Incoming gas enters tangentially, creating a spinning vortex. Heavier particles are thrown to the outer wall, lose velocity, and fall into the collection hopper. Cleaned gas exits through the central outlet.
Cyclone separators achieve separation efficiencies of 70-90% for coarse particles (typically above 10–15 microns). For fine particles below 10 microns, a cyclone is used as a primary pre-cleaner ahead of a bag filter. This two-stage arrangement reduces the dust load on the bag filter, extends bag life, and protects the bags from abrasive particle damage.
Cyclones require no filter media replacement, operate under high temperature and high-moisture conditions where fabric filters are unsuitable, and have minimal moving parts. They are well-suited for cement, mineral processing, grain handling, and foundry applications.
View Cyclone Separator Details →
Scrubbers
A scrubber removes gaseous pollutants, acid fumes, and soluble particulates from an exhaust stream using a liquid contact medium, typically water or a reagent solution. The pollutant-laden gas contacts the liquid in a packed column or spray chamber. Soluble gases and fine particles are absorbed into the liquid. The cleaned gas exits; the spent liquid is treated and recirculated or discharged.
Scrubbers are the correct equipment when the exhaust stream contains:
- Acid fumes: HCl, SOâ‚‚, HF, Hâ‚‚SOâ‚„ vapours
- Soluble gases from chemical reactors, electroplating lines, or incinerators
- High-humidity gas streams where bag filters risk condensation and blinding
- Odorous compounds from organic processing, waste treatment, or food production
Dry bag filters cannot absorb gaseous pollutants. When gas composition analysis shows soluble or reactive fumes, a scrubber is the technically correct solution.
AS Engineers supplies wet scrubbers in packed tower, spray tower, and venturi configurations. Material of construction ranges from FRP to SS 316L and HDPE-lined carbon steel, selected on the basis of liquid pH, temperature, and operating pressure.
Equipment Selection Guide: Which System for Which Application?
| Pollutant Type | Particle Size | Temperature | Recommended Equipment |
|---|---|---|---|
| Coarse dust, >15 micron | Coarse | Up to 400°C | Cyclone separator |
| Fine dust, 1–15 micron | Fine | Up to 250°C | Bag filter |
| Fine dust, high initial load | Fine + coarse | Up to 250°C | Cyclone + bag filter in series |
| Acid fumes, SO₂, HCl | Gas phase | Up to 80°C | Wet scrubber |
| Soluble gases + fine particulate | Mixed | Up to 80°C | Scrubber + secondary bag filter |
| High-moisture, condensing gas | Fine | Near dew point | Scrubber or PTFE bag filter |
For cement kiln exhaust, raw mill circuits, and coal handling: cyclone as primary plus bag filter as secondary is the standard configuration. For chemical plant vent streams with acid vapours: scrubber is mandatory before any fabric filter to prevent acid attack on filter bags.
Complete Emission Control Systems: Blower Included
A pollution control system moves gas. That requires a correctly sized blower. Under-sized blowers reduce gas velocity through the filter, causing poor particle separation. Over-sized blowers increase energy consumption and can collapse bag filter housings designed for lower static pressure.
AS Engineers manufactures both the pollution control equipment and the centrifugal blowers that drive the system. This means airflow, static pressure, and equipment sizing are matched as an integrated design from the same engineering team. Plants dealing with mismatched blower-filter systems know how rare this combination is from a single supplier.
Industries Served
AS Engineers has supplied pollution control equipment to plants across these industries. Visit our industries page for application-specific details.
- Cement — kiln ID fan exhaust, raw mill circuits, clinker cooler vents
- Chemical — reactor vents, dryer exhaust, solvent recovery systems
- Pharmaceuticals — spray dryer exhaust, granulator vents, GMP-compliant housings
- Fertilizer — prill tower dust, granulation exhaust, ammonia scrubbing
- Food and Beverage — flour milling, grain handling, spice processing
- Water and Waste Treatment (ETP/STP) — odour control scrubbers, dewatering area vents
- Power Plants — FD/ID fan systems, fly ash handling, baghouse replacement
- Steel and Foundry — fume extraction, induction furnace vents, melt shop exhaust
Documentation and Compliance Support
After commissioning, industrial plants face stack emission monitoring under CPCB Continuous Emission Monitoring System (CEMS) requirements and periodic third-party stack testing under SPCB directives. AS Engineers provides performance certificates, GA drawings, and engineering documentation that support stack test submissions. This is particularly relevant for cement, chemical, and power sector plants operating under Environment Impact Assessment (EIA) conditions.
Why AS Engineers
AS Engineers has been designing industrial air and gas handling equipment since 1997. The pollution control equipment range was built around the same application engineering approach used for the centrifugal blower product line: every specification is developed from the actual gas composition, volume, temperature, and particle load data, not from a standard model selection sheet. ISO 9001:2015 certified manufacturing ensures dimensional consistency, material traceability, and documented quality records for each unit supplied.
Frequently Asked Questions
What is the difference between a cyclone separator and a bag filter?
A cyclone separator uses centrifugal force and is effective for coarse particles above 10–15 microns. A bag filter uses fabric filtration and captures fine particles down to 1 micron with over 99% efficiency. For high-dust-load applications, both are used in series: cyclone as pre-cleaner, bag filter as final polishing stage. This combination extends bag life and reduces maintenance costs.
When should I use a scrubber instead of a bag filter?
Use a scrubber when the exhaust stream contains soluble gases such as HCl, SOâ‚‚, HF, or ammonia, or when gas humidity is high enough to cause condensation inside a bag filter. Fabric filters trap particles but cannot absorb gaseous pollutants. For mixed streams with both fine particulate and acid fumes, a scrubber followed by a bag filter is the standard configuration.
Can AS Engineers supply a complete emission control system including the blower?
Yes. AS Engineers manufactures centrifugal blowers alongside pollution control equipment. Airflow, static pressure drop across the system, and blower motor sizing are engineered together as a matched system. This eliminates the common problem of mismatched blower-filter combinations that result in poor separation efficiency or premature bag failure.
What construction materials are available for pollution control equipment?
AS Engineers supplies equipment in mild steel, SS 304, SS 316, SS 316L, FRP, and HDPE-lined carbon steel, depending on the gas composition, temperature, and corrosion requirements. High-temperature bag filters for cement kiln applications use aramid or PTFE filter bags. Scrubbers for acid fume applications use FRP or SS 316L construction.
How do I know which pollution control equipment meets CPCB emission norms?
CPCB emission standards specify maximum outlet concentrations in mg/Nm³ for SPM and specific pollutants, varying by industry category and stack height. The correct equipment type and specification is determined by inlet gas composition analysis, mass flow rate, and the required outlet concentration to achieve compliance. Share your stack data or process sheet with our engineering team and we will specify the correct equipment configuration.
Does AS Engineers provide on-site commissioning and performance testing?
Yes. Installation support, commissioning, and performance verification testing are part of the project scope for pollution control equipment. Engineering documentation including GA drawings, equipment data sheets, and performance test certificates can be provided to support SPCB/CPCB compliance submissions.
Talk to Our Engineering Team
If you have emission data, process conditions, or a current SPCB compliance requirement, share the details with us. We will evaluate the right equipment type and specification for your application.