Is CFB boiler the key to scaling up biomass?

Summary:Biomass has an important role in reducing the environmental effects of energy production both in pure biomass plants and in coal and biomass co-combustion. CFB boilers are capable of firing a broad variety of solid biomass fuels for small industrial plants as well as large utility power plants.

30-07-2015

An evolving biomass market

Today, the biomass marketplace has changed from local to global. Biomass fuels are dried and compressed into pellets to improve the economics and logistics of moving them around the globe. Pellets are currently being produced in Brazil, the US and Canada, for example, for transportation to Europe and Asia.
To date, biomass combustion systems primarily fire forest industry residues such as wood chips, sawdust and bark. However, as the demand for biomass fuels grows and the price for wood-based biomass rises, there is a growing interest in biomass from other sources, e.g. agricultural biomass, biomass residue and biomass wastes. Some countries promote biomass use through environmental incentives that offset its additional transportation and logistics costs, while others only permit new plants that can use biomass. Such policies have amplified the interest for large-scale biomass-fired units with increased efficiency, extended availability and broader fuel flexibility.
Biomass properties vary considerably depending on their biological and regional origin, seasonality, farming and harvesting practices, and ultimately on their preparation and processing. This leads to broad variations in chemical composition and physical properties across different biomass types and even within the same type. These wide property differences are one of the key challenges of using biomass as a fuel for electricity production.

CFB boiler the key to scaling up biomass

Large-scale CFB biomass boilers

Circulating fluidised bed (CFB) boilers are ideal for efficient power generation, capable of firing a broad variety of solid biomass fuels in applications ranging from small combined heat and power plants to large utility power plants. My company has progressively advanced and scaled up CFB technology for biomass firing since the 1980s, starting from small multi-fuel boilers in pulp and paper mills to Advanced Bio CFB technology firing a range of biomass fuels.
This advanced technology further improves the well-known benefits of earlier CFB technologies to include unprecedented fuel flexibility, inherently low emissions, and high availability. Designs of efficient subcritical boilers firing 100 per cent biomass are available to 600 MWe. This technology also offers supercritical steam boiler designs for biomass and coal co-firing applications up to 800 MWe.
Plant requirements include the type of boiler (i.e. utility or industrial), capacity, operational load range, steam data, emission limits and other legislated requirements. Investment factors include plant availability, fuel flexibility requirements and investment and operating costs. Consequently, economical boiler designs have been developed to fire easy-to-burn biomass, while more robust solutions are implemented as the biomass quality degrades and becomes more challenging to burn reliably. Among the marketed biomass fuels, agricultural residue (agros), such as some straws, and olive and rapeseed residue are identified as the most problematic. These hold the highest potential to create operational difficulties such as agglomeration of fluidised beds and fouling and corrosion of convective heat surfaces.
These problems can be traced back to elevated concentrations of alkali, phosphorous and chlorine, which are typically much higher in most agros than in wood. This unfavourable composition is the main reason why the use of novel biomass fuels has been limited in energy production.
Detailed knowledge of biomass specifications and a full understanding of their variability of supply are paramount to designing boilers with the highest efficiency and availability, and to operating them in the most economical way. Design features of the Advanced Bio CFB technology.
To provide effective fuel management, all types of biomass are transported by trucks to the plant's unloading station and conveyed to silos in the storage yard. There are three storage silos, each dedicated for forest and woody biomass, and five silos for agro biomass. Each agro fuel is fed from a separate silo, since the fuel mixture consists of straw pellets, oat husk, cherry stones, rapeseed cake and energy willow. The system allows the dosing of different types of biomass using screw conveyors in order to feed a homogenous fuel mixture to boiler day silos. The mixture of different types of biomass is distributed evenly to the boiler by four feeding points. The fuel is fed to solid return chutes from external integrated heat exchangers and mixed with circulating material before entering the furnace.
For emissions control, the CFB utilises a low and uniform temperature profile in the furnace and staged combustion. In addition to these combustion process-related measures, the boiler is equipped with an ammonia injection system and catalyst (SNCR+SCR) for controlling NOx emissions, and an electrostatic precipitator for controlling particulate emissions.

CFB & biomass: good bedfellows

Biomass has an important role in reducing the environmental effects of energy production both in pure biomass plants and in coal and biomass co-combustion. CFB boilers are capable of firing a broad variety of solid biomass fuels for small industrial plants as well as large utility power plants.
Advanced Bio CFB technology represents the state of the art for large-scale (up to 600 MWe) 100 per cent biomass fuel firing. Based on current reference plants, the technology has been proven to be highly efficient and fuel-flexible, with the capability of firing 20-30 per cent of difficult agro biomass.
Thus, advanced CFB technology provides a solution for effective CO2 reduction in large-scale power generation with a broad range of solid biomass fuels, making it the ideal choice in meeting the market's demand for fuel flexibility and low emissions.

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We have over 70 years' experience of boiler and autoclave, and we have a professional installation and after-sales staff for products.Take advantage of the most economical way to improve efficiency and operating flexibility, Get substantial savings on your fuel costs,Reduce all emissions for each K/W of electricity generated, including CO2.

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Basic Information of CFB Boiler manufacturer--- ZG Boiler

Established:In 1945

Number of Employees:above 1500 People

Our products:industrial horizontal steam boiler and hot water boiler(biomass boiler, gas boiler, oil boiler, coal boiler, etc), CFB boiler, power plant boiler, waste heating recovery boiler, Pressure Vessel(AAC autoclave, Curing tank,etc )

Factory Size (Sq.meters):400,000 square meters

Factory Location:Factory 1: Zhengzhou,,Henan, China. Factory 2: Xingyang,Henan,China

Number of R&D Staff:376 people

Our Trade & Market

Export Percentage:30-40%

Total Annual Sales Volume:US$100 Million

Main Market:South America(Colombia, Venezuela, Guyana, Suriname, Ecuador, Peru, Brazil, Bolivia, Chile, Paraguay, Uruguay, Argentina and French Guiana),
North America(Bahamas, Canada, Costa Rica, Cuba, El Salvador, Guatemala, Honduras, Haiti, Jamaica, Mexico, Nicaragua, Panama),
Eastern Asia(Mongolia / Russia / North Korea / South Korea / Japan),
Oceania(Australia, New Zealand, Fiji),
Mid East(Bahrain, Egypt, Iran, Iraq, Israel, Jordan, Kuwait, Lebanon, Oman, Qatar, Saudi Arabia, Syria, UAE and Yemen, Palestine, Algeria, Libya, Morocco, Tunisia and Sudan, Mauritania and Somalia),
Africa(Egypt, Sudan, Libya, Tunisia, Algeria, Morocco, Ethiopia, Somalia, Kenya, Tanzania, Sierra Leone, Liberia, Cote d'Ivoire, Ghana, Togo, Niger, Nigeria, Cameroon, Gabon, Congo (Brazzaville), Zambia, Zimbabwe, Angola, Mozambique, Botswana, Namibia, South Africa),
South Asia(Nepal, Bhutan, India, Pakistan, Bangladesh, Sri Lanka, Maldives)
Southeast Asia(Vietnam, Laos, Cambodia, Thailand, Myanmar, Malaysia, Singapore, Indonesia, Brunei, the Philippines, East Timor)
Domestic Market(China)

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Biomass CFB Boiler Plant in Bahamas

In Bahamas, the biomass can be burned using conventional combustion technology like grate furnace or fluidized bed boilers. For power generation the biomass would be charged to the furnace of a steam boiler.Steam produces by the boiler will then drive a steam turbine generator to generate electricity. The typical capacity range for biomass power plants 1-20MW.

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Zhengzhou Boiler Co., Ltd (ZG Group), founded in 1945, is a joint-stock enterprise with A Grade Boiler design and manufacture license permits. Over 60 years' experience in Boiler design and manufacturing has rewarded us with an industrial boiler(circulating fluidized bed boiler, oil & gas fired boiler, chain grate boiler, waste heat boiler).

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