Objective
To utilize economically available biofuels and in origin classified refuses (REF) in the existing pulverized coal-fired power plant by gasifying the fuels in a large scale CFB gasifier and by burning the hot, low-heat value gas in the boiler.
300 GWh/a biofuels and REF will be gasified and 30% of the annually used coal in the boiler will be replaced by the gas. Correspondingly, SO2 emissions and CO2 emissions from fossil fuels will be decreased.
The expected energy savings are calculated to be 7.51 MFIM/a which equals to 1.32 MECU/a. The payback time for the investment is 9.9 years whereas the life span of the installation is 20 years.
The first results of the measurements are about to be ready and the missing figures are expected to be available by the beginning of September. The first indications are very positive. The product gas quality is very close to the calculated values and as regards the first indications of the stack emissions, almost all changes are to the positive direction. A decrease can be seen in NOx, SOx and particulate emission and concerning the dioxins no change could be seen compared to the references tests. As regards the heavy metals a slight increase could be seen for some elements due to the use of REF fuel. However, the heavy metal emission level is still very low : in practice very close to the level measured with 100 % coal combustion.
The large modern power plants are commonly using coal as fuel. The boilers used are often so called Benson-type once-through steam boilers since their power production efficiency is very good. For biomass it is possible to build up a firing grate inside the boiler, but it is very difficult and expensive. Furthermore, any problem in the grate can result in a shutdown of the large power plant. The space available for the grate is normally limited and the biofuel firing capacity will be small.
The atmospheric CFB gasification of dried biofuel is commercial technology. The gasification of wet biofuel is simple, but the produced gas has very low heat value and it is difficult to burn under ambient conditions. When the hot gas is led directly into the boiler, the co-combustion of the lean gas is possible in the gas burner. By means of the innovative feeding system, it is possible to adjust the moisture content of the fuel mixture, and hence the gas heat value. An expensive fuel dryer isnot required.
Thus, the innovative aspects :
1. Use of biofuels and REF in the existing once-through steam boiler by gasifying the wet fuels directly.
2. Gasification of fuels in the large scale (30-70 MW) atmospheric circulating fluidized bed gasifier.
3. Burning of lean and hot gas directly in the boiler to ensure good fuel burn-out and destruction of toxic organic compounds.
The fuel prices on the following calculations of the economic aspects of the project are based on actual prices (coal, biofuels) and on budgetary proposal (REF).
Fuel Amount Price Price Cost Cost
GWh FIM/MWh ECU/MWh MFIM/a MECU/a
Coal 300 56.70 10.00 17.01 3.00
With substitute fuels :
REF 100 25.00 4.41 2.50 0.44
Biofuels 200 35.00 6.17 7.00 1.24
Total 300 9.50 1.68
Savings by coal substitution E = 7.51 1.32
The monitoring phase of the project consists ofthe following stages : After the start-up, the gasifier-boiler process performance will be measured in a performance test. Based on the results, energy efficiencies of the process will be calculated. Performance of the fuel feeding system and overall process stability will be studied. The performance test period will last 4...5 weeks. The process performance will then be monitored for 1 year. During this period, the annual load and fuel quality cycles will be passed. The fouling and corrosivity of the ashes will be actively monitored with probes and boiler inspections.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- engineering and technology environmental engineering ecosystem-based management climatic change mitigation
- engineering and technology environmental engineering energy and fuels fossil energy coal
- engineering and technology electrical engineering, electronic engineering, information engineering electrical engineering power engineering electric power generation combined heat and power
- social sciences economics and business economics production economics
- engineering and technology industrial biotechnology biomaterials biofuels
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Coordinator
15101 Lahti
Finland
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