Fly ash from coal combustion in the CFB boiler

Summary:The article shows the comparative results of two fly ash from coal combustion in the CFB (circulating fluidized bed) boiler. Over the years the market for combustion by-products (CBP) has been constantly changing. It touches both the widening of the range of the fuels used and the direction and amount of the ash used in the cement and building industries, as well as in the road industry.

17-08-2015

The article shows the comparative results of two fly ash from coal combustion in the CFB (circulating fluidized bed) boiler. Over the years the market for combustion by-products (CBP) has been constantly changing. It touches both the widening of the range of the fuels used and the direction and amount of the ash used in the cement and building industries, as well as in the road industry. Coal mines, one of the major mass recipients of fly ash have expe-rienced the temporary difficulties with access to the chosen types of ash, especially the most wanted ones showing the best binding properties, and at the same time the over-supply of CBP in power plants located within further from coal mines.

Fly ash from coal combustion in the CFB boiler

Another important aspect of the changes is the con-stant widening of the fuel range used in power plants (bio-mass, waste fuels, sewage sludge) . The addition of biomass is justified by both the reduction of gas pollution and the necessity of the share in ‘green energy,’ as well as the possibility of obtaining the additional funds, but also in some cases the quality of the fuel. The type of co-combusted biomass is mainly deter-mined by the existence of the agriculture and wood industry in the area, the farms of energy plants, and the cost of transportation. Among the frequently co-combusted bio-mass are: wood, wood chips, bark, straw, olive mill cake, and sunflower husks . The properties of fly ash from co-combustion depend greatly on the burning conditions (the kind of boiler, tem-perature of burning), the amount and chemical composition of the ash from coal and biomass, as well as the share of the biomass in the mixture with coal.

Lignite fuel in CFB boiler analysis

In the first case the lignite was the only fuel, in the second one 8% of the fuel mass was made by wood bio-mass pellet. The aim of the research was to determine the differences of properties among different ash and the suspensions made of them in order to use them in mining technologies, mainly for filling underground voids and sealing and caulk-ing of gob (breaking down zone) resulting from coal exploitation.

Biomass fuel in CFB boiler analysis

Biomass is a kind of fuel that is more and more often used in the energy industry. It supplements coal and allows it to meet the requirements of producing “green” energy and limit CO2 or sulphur emissions. Research refers to the ash originated from the combustion of the lignite with and without the wood biomass in the CFB boiler. This article shows the results of research into physical-chemical properties of fly ash obtained from the combustion of the lignite with and without the wood biomass (wood pellet). The possibilities of the use of this ash include in suspension technologies widely used in coal mines.

Conclusion:

The general conclusion from the conducted research for the recipients using both these kind of wastes and other ones coming from the coal combustion is that even the smallest addition of the fuel of different type (e.g. biomass) can change the properties of the used suspensions.

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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

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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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