Editorial Technical Reference

Off-gas Cleaning System

This page explains how Off-gas Cleaning System is classified within Basic Metal Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A system designed to remove pollutants and particulate matter from exhaust gases generated during steelmaking processes.

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Product Specifications

Technical details and manufacturing context for Off-gas Cleaning System

Definition
An essential environmental control component within the Integrated Direct Reduction Iron and Electric Arc Furnace Steelmaking System, responsible for treating and cleaning the hot, dust-laden, and potentially toxic off-gases produced during the direct reduction of iron ore and subsequent melting in the electric arc furnace. Its primary role is to meet environmental regulations, recover process heat, and protect downstream equipment by removing particulate matter (dust), sulfur compounds, nitrogen oxides, and other contaminants before the cleaned gas is released into the atmosphere or recirculated. The system is typically installed as a part of the overall steelmaking plant, interfacing with the furnace off-gas ducting and the stack. It is selected based on the exhaust gas volume, temperature, and contaminant load, which vary with furnace operation and raw material quality. The system includes components such as a cooling section, cyclones, bag filters or electrostatic precipitators, and scrubbers, each chosen to meet specific emission limits and process requirements. Materials of construction include carbon steel for structural parts, stainless steel for corrosive sections, refractory linings for high-temperature zones, and filter fabrics such as PTFE or fiberglass. Key parameters to verify with the manufacturer include rated air flow (5000–50000 m³/h), operating temperature (150–350 °C), filtration efficiency (99.5–99.9% per ISO 16890), pressure drop (1.5–3.0 kPa), power supply (380 V AC ±10%, 50/60 Hz per IEC 60038), motor power (15–75 kW), noise level (75–85 dB(A) at 1 m per ISO 3744), dust removal efficiency (99.0–99.9% for particles >1 µm per GB/T 6719), corrosion resistance (C4–C5 per ISO 12944), weight (2000–8000 kg), and footprint (10–30 m² excluding ductwork and stack). These values are reference ranges and must be confirmed for the specific model and application. Always verify model-specific values and standards with the legal manufacturer or supplier.
Working Principle
The system typically operates by first cooling the high-temperature off-gas, often through water quenching or heat exchangers. The cooled gas then passes through a series of cleaning stages, which may include cyclones for coarse particle removal, bag filters or electrostatic precipitators for fine particulate collection, and scrubbers (wet or dry) for acid gas removal (e.g., SOx, HCl). The collected particulates (dust) are handled for disposal or recycling, while the cleaned gas is exhausted via a stack.
Common Materials
Carbon Steel, Stainless Steel (for corrosive sections), Refractory Linings, Filter Fabrics (e.g., PTFE, fiberglass)
Technical Parameters
ParameterTypical rangeNotes & selection driver
Rated Air Flow5000–50000 m³/hSelect based on exhaust gas volume from furnace.
Operating Temperature150–350 °CHigher temperatures may require cooling before filtration.
Filtration Efficiency99.5–99.9 %For PM2.5 and above, depending on filter class.ISO 16890
Pressure Drop1.5–3.0 kPaHigher pressure drop increases energy consumption.
Power Supply380 ±10% V ACThree-phase, 50/60 Hz.IEC 60038
Motor Power15–75 kWDepends on fan and pump requirements.
Noise Level75–85 dB(A)At 1 m distance; may require silencers.ISO 3744
Dust Removal Efficiency99.0–99.9 %For particles >1 µm.GB/T 6719
Corrosion ResistanceC4–C5 ISO 12944C5 for coastal or acidic environments.ISO 12944
Weight2000–8000 kgIncluding structural supports.
Footprint10–30 Excluding ductwork and stack.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Quench Tower
    Rapidly cools the high-temperature off-gas by direct water injection to prevent damage to downstream filters and reduce gas volume.
    Material: Carbon Steel with refractory lining
  • Bag Filter House
    Removes fine particulate matter from the gas stream by passing it through fabric filter bags that capture dust on their surface.
    Material: Carbon Steel, PTFE/Glass Fiber Filter Bags
  • ID Fan
    Induced draft fan that provides the necessary pressure to move the gas through the entire cleaning system and out the stack.
    Material: Carbon Steel / Stainless Steel
  • Dust Handling System
    Collects, conveys, and stores the particulate matter removed from the gas, typically including hoppers, screw conveyors, and storage silos.
    Material: Carbon Steel
  • Scrubber
    Removes acid gases (SOx, HCl) and additional fine particulates through contact with a scrubbing liquid (water or reagent solution).
    Material: FRP (Fiber Reinforced Plastic) / Stainless Steel
  • Cyclone Optional
    Drops out the coarse particles ahead of the fabric filter so the bags last longer.
  • Exhaust Stack
    Discharges the cleaned gas to atmosphere at height.

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 1.5 bar (g) maximum system pressure
flow rate: 10,000-500,000 Nm³/h (standard design range)
temperature: 50-400°C (typical operating range)
slurry concentration: 5-15% solids by weight (optimal range)
Media Compatibility
✓ Wet scrubbing with alkaline slurry (e.g., lime/limestone) ✓ Venturi scrubber configuration for high-efficiency particulate removal ✓ Fabric filter baghouse for dry particulate collection
Unsuitable: High-chloride environments (>1000 ppm) due to corrosion risks
Sizing Data Required
  • Exhaust gas volumetric flow rate (Nm³/h)
  • Inlet particulate loading (g/Nm³)
  • Required outlet emission concentration (mg/Nm³)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Corrosion-induced perforation
Cause: Exposure to acidic gases (e.g., SOx, NOx) and chlorides forming corrosive condensates, accelerated by temperature cycling and material incompatibility.
Filter media blinding/plugging
Cause: Accumulation of particulate matter (e.g., fly ash, unburned carbon) beyond design capacity, often due to improper upstream process control or inadequate cleaning cycle optimization.
Maintenance Indicators
  • Visible particulate emissions or opacity increase at stack outlet indicating filter breach or seal failure.
  • Abnormally high system pressure drop accompanied by audible straining or whistling from blowers/fans, signaling flow restriction.
Engineering Tips
  • Implement real-time corrosion monitoring with ultrasonic thickness testing at critical zones (e.g., duct transitions, quench sections) and upgrade to corrosion-resistant alloys or linings based on gas analysis.
  • Optimize pulse-jet cleaning cycles using differential pressure trend analysis and install pre-filtration (e.g., cyclone separators) to reduce particulate loading on final filter stages.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 8573-1:2010 (Compressed air purity classes and contaminants) ANSI/ASME B31.3:2022 (Process piping design and construction) DIN EN 1092-1:2018 (Flanges and their joints for piping systems)

Quoted from the published standard.

Manufacturing Precision
  • Pipe wall thickness: +/-0.5mm for corrosion allowance
  • Flange bolt hole alignment: +/-1.0mm for assembly
Quality Inspection
  • Leakage test (pressure decay method per ISO 20486)
  • Material verification test (X-ray fluorescence analysis for alloy composition)

Manufacturers of Off-gas Cleaning System

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Frequently Asked Questions

What is the typical operating temperature range for this off-gas cleaning system?

According to the directory reference, the operating temperature range is 150–350 °C. Higher temperatures may require cooling before filtration. Confirm the exact range for your specific model with the manufacturer.

What filtration efficiency can be expected?

The filtration efficiency is listed as 99.5–99.9% for PM2.5 and above, depending on the filter class, per ISO 16890. The dust removal efficiency for particles >1 µm is 99.0–99.9% per GB/T 6719. These are reference ranges; verify with the supplier.

What materials are used in the construction?

Materials on file include carbon steel for structural parts, stainless steel for corrosive sections, refractory linings for high-temperature zones, and filter fabrics such as PTFE or fiberglass. The exact material selection depends on the application and must be confirmed with the manufacturer.

How is the system selected for a specific steelmaking plant?

Selection is based on exhaust gas volume, temperature, and contaminant load, which vary with furnace operation and raw material quality. Key parameters such as rated air flow (5000–50000 m³/h), operating pressure (1.0–1.6 MPa), and operating temperature (150–350 °C) must be matched to the plant's requirements. Always consult the manufacturer for a detailed engineering evaluation.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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