B&W offers a variety of solutions for the removal of acid gases such as sulfur oxides (SO2 and SO3), hydrogen chloride (HCl), hydrogen fluoride (HF) and other hazardous air pollutants (HAPs).
Wet Scrubber - Flue Gas Desulfurization (FGD)
B&W’s proven technology, flexibility of design options and advanced features of our wet flue gas desulfurization (FGD) systems help to reduce emissions in new or retrofit applications.
Our wet FGD systems, or wet scrubbers, have operated efficiently, economically and reliably since 1971.
Current designs can achieve more than 99% SO2 removal, with system availability greater than 99.5%. Our absorber design also provides reduced operating and maintenance costs.
As a multi-pollutant control device, B&W’s wet scrubbers also help control filterable (solid) particulate, acid mist and mercury.
Features and benefits include:
- Forced or inhibited oxidation – provide options for selling gypsum byproduct or eliminating wastewater discharge
- Single or dual tray designs – promotes gas/liquid contact and uniform gas distribution for improved emissions reduction
- Large, single absorber capability to treat multiple boilers – smaller plant footprint and reduced operating costs
- Choice of reagents – provides flexibility
- Interspatial spray headers – more effective overlapping spray coverage for shorter absorber towers, reduced pump power, lower building height, less external recirculation piping, and easier nozzle inspection and maintenance
- Moisture separators – rugged and effective design helps prevent slurry carryover
In addition to flue gas absorbers, we supply complete systems, including reagent preparation, dewatering and related system equipment. Our wet FGD experts provide design and engineering as well as start-up, commissioning and support services.
- Applicable boiler sizes: 50 MW to 1300 MW
- Removal efficiencies: Up to 99%
- Reagents: Primarily limestone; also lime, magnesium-enhanced lime, sodium carbonate, and ammonia.
- Fuels: All solid fuels — primarily coal.
Dry Sorbent Injection Systems
As part of our complete line of multi-pollutant control technologies, B&W’s dry sorbent injection (DSI) systems provide a low-cost solution to address all acid gas emissions.
Our DSI systems provide a low-cost solution to capture acid gases, either separately or combined. When used solely for SO2 control, DSI systems are ideal for coal-fired boilers (typically less than 300 MW), biomass boilers and industrial applications. On larger units, DSI systems also can be used for HCl or SO3 control when combined with other air emissions control technologies.
Benefits of our DSI technology include:
- Provides up to 80% SO2 removal efficiency, and high HCl and SO3 removal efficiencies
- Flexible design
- Low capital, operation and maintenance costs
- Designed to handle a variety of reagents
- Effectively integrated with a spray dryer absorber (SDA) and fabric filter for a packaged approach to particulate, mercury and acid gas control
- Multiple injection location options to suit the application
- Available for new plant installations or retrofit into existing plants
- Mobile demonstration test unit
Major components include: truck/rail unloading, silo and reclaim system, weigh hopper and feeder, transport air blowers, proprietary injection lance design, and reagent milling (optional)
Spray Dryer Absorber (SDA)
SDA systems are designed for utility boilers typically burning low to medium sulfur coals, smaller utility applications and combined HCl and SO2 control on waste-to-energy units. B&W’s typical SDA system installations meet or exceed air quality regulations and operate at 90 to 95 percent SO2 removal efficiency, with some plants running as high as 98 percent. SO3, HCl and HF removal efficiencies are normally greater than 95 percent.
We are the exclusive North American licensee of GEA Process Engineering A/S, Denmark, for the GEA Niro SDA process. Since our first full-scale SDA in 1980 and our numerous installations since, this process remains globally recognized by the industry as the spray dry flue gas desulfurization (FGD) technology of choice.
Our SDAs feature:
- Reliable rotary atomization
- Efficient flue gas dispersion system
- High solids reagent recycle
- Innovative process control
- Control of drying conditions to minimize potential deposition and corrosion
Benefits of our SDA applications include:
- High SO2 removal
- Integral SO3, HCl, HF, heavy metals and particulate emissions reduction
- Low capital, operation and maintenance costs
- High system availability
- Low auxiliary power use
- Low fresh water consumption
- Inherent oxidized mercury emissions reduction
Circulating Dry Scrubber (CDS)
B&W’s circulating dry scrubber (CDS) technology is ideal for small footprints and big expectations for SO2 removal.
B&W is the exclusive North American licensee for Enviroserv’s circulating dry scrubber technology (CDS). CDS technology is designed for smaller units with limited space or which have site-specific needs and fire medium- to high-sulfur coals.
Benefits of a CDS:
- High SO2 removal efficiency
- Integral SO3, HCl, HF, mercury, heavy metals, dioxins and furans, and PM2.5 emissions reduction
- Fuel flexibility to handle higher sulfur coals
- Low capital cost
- Low auxiliary power use
- Low operational and maintenance costs
- Dry reagent preparation and recycle system operation
- Low fresh water consumption
- Integral consumption of plant waste water streams for zero liquid discharge (ZLD) operation
- Absorbent feed independent of water injection (compared to an SDA)
When integrated with our fabric filter and dry sorbent injection technologies, our CDS offers a packaged approach to particulate, mercury and acid gas control.
Source: Babcock & Wilcox Enterprises
Advertisement
The 10 largest coal producers and exporters in Indonesia:
The 10 largest coal producers and exporters in Indonesia:
