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Boilers/Burners

Natural Gas Conversions of Existing Coal-Fired Boilers

COAL POWER magazine :: Operations & Maintenance >> 
Why should utilities consider converting existing coal-fired plants to burn gas? We explore the rationale for fuel switching, some of the options available for the conversion of coal-fired units, technical considerations related to conversion, and some of the financial considerations that will impact the final decision....

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Applying CFD to Optimize Furnaces Cofiring Biomass, and the Impact of Cofiring on SCR

COAL POWER magazine :: Operations & Maintenance >> 
The international policy framework regulating the emissions of greenhouse gases from industrial and utility boilers is in flux. Meanwhile, most boiler owners are evaluating potential strategies for when, not if, more stringent emissions reduction regulations are put in place. One of the most attractive compliance options is the cofiring of biomass in existing coal-fired boilers....

Read more: Applying CFD to Optimize Furnaces Cofiring Biomass, and the Impact of Cofiring on SCR

Improved Coal Fineness Improves Performance, Reduces Emissions

COAL POWER magazine :: Operations & Maintenance >> 
Utilizing engineering ingenuity and today’s developing computational fluid dynamics tools, a new classifier design is now available that significantly improves fineness from pulverizers without the heavy costs associated with dynamic classification or any downsides on pulverizer capacities, maintenance, and parasitic power.  Instead, operational flexibility and improved emission control options are enhanced....

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Enhanced Capture of Mercury Using Unique Baghouse Filter Media

COAL POWER magazine :: Operations & Maintenance >> 
Several states have already instituted mercury emission limits in expectation of tightening mercury emission rules that will require reductions of up to 91%. Coal-fired plants searching for an economical way to meet the new limits may need to look no further than replacing their baghouse filter elements....

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Pulverizers 101: Part II

COAL POWER magazine :: Operations & Maintenance >> 
Pulverizers prepare the raw fuel by grinding it to a desired fineness and mixing it with the just the right amount of air before sending the mixture to boiler burners for combustion. In Part I of this three-part report, we examined the essentials of pulverizer design and performance.  In the second part, we discuss the importance of fuel fineness. In the final article, we will discuss the importance of air and fuel measurement....

Read more: Pulverizers 101: Part II

Airflow and HVAC Maintenance

july m15 21Airflow and HVAC Maintenance

AIRFLOW, AIRFLOW, AIRFLOW, AIRFLOW.  AIRFLOW is the single most critical element in the correct operation of ALL air heating and cooling systems. Yet most systems do not have the correct airflow. (Read More)

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In-Line Sorbent Milling Improves Dry Sorbent Injection Performance

COAL POWER magazine :: Operations & Maintenance >> 
Complying with air emissions rules doesn’t always require construction of a scrubber or SCR. Finely ground trona has proven to be very successful at economically removing SO3, SO2, and HCl from stack gases....

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Why Coal Plants Retire: Power Market Fundamentals as of 2012

COAL POWER magazine :: Operations & Maintenance >> 
Announcements about coal plant retirements have become commonplace. Are new EPA rules completely to blame, or are there other power market pressures at play?...

Read more: Why Coal Plants Retire: Power Market Fundamentals as of 2012

Coal Could Regain Ground from Gas as Summer Demand Ramps Up

COAL POWER magazine :: Operations & Maintenance >> 
Natural gas-fired generation enjoyed a competitive advantage through this past winter and spring as historically low prices for the commodity combined with mild weather and relatively light demand to turn the dispatch stack on its head and favor gas over coal. That advantage is narrowing as summer demand approaches. A senior market analyst with Bentek Energy expects coal-fired generation to be advantaged at least until the fall shoulder season....

Read more: Coal Could Regain Ground from Gas as Summer Demand Ramps Up

Optimizing Your Coal Ash Recovery Operation

COAL POWER magazine :: Operations & Maintenance >> 
Coal combustion products often can be recycled into a variety of construction and building materials. However, first you must be able to retrieve the wet ash from a holding pond before the ash can be dried and sold....

Read more: Optimizing Your Coal Ash Recovery Operation

Jinzhushan 3: The World’s First PC-Fired Low Mass Flux Vertical Tube Supercritical Boiler, Part 3

COAL POWER magazine :: Operations & Maintenance >> 
The world’s first supercritical pulverized coal–fired low mass flux vertical tube Benson boiler is Jinzhushan 3, located in the Hunan Province of the People’s Republic of China. The 600-MW Babcock & Wilcox Power Generation Group Inc. once-through boiler burns Chinese anthracite using downshot pulverized coal (PC) technology. Part 1 of this three-part article presented a summary of the project design features. Part 2 discussed the boiler technology. This third and final part reviews the plant’s performance test results....

Read more: Jinzhushan 3: The World’s First PC-Fired Low Mass Flux Vertical Tube Supercritical Boiler, Part 3