В папку для зачета / Critical review - Сивков

Reference: Sharer, Michael, “Alabama power company gadsden steam plant, unit no. 2, bio-mass fuel project – dirty air/isokinetic fuel sampling”, Innovative combustion technologies report # 2k7-130
Section of paper:	Summary:	Opinion:
Inputs:	Green wood chips produced from coniferous trees. Traditional charcoal Green wood chips in blends with coal between 8% and 15% wood by weight. The moisture content of wood chips (50% -67%).	Could be compared the pure calorific value of coal and wood chips. Not considered a wide range of moisture.
Method:	Green wood chips were successfully co-fired in blends with coal between 8% and 15% wood by weight. Burning green wood chips in different proportions with coal in power station's boiler plant. Selection of the optimum moisture content of the mixture by comparing the rate of burning. Statistical and graphical comparisons, inferring the optimal performance of wood coal mixture.
Results:	Green wood chips were successfully co-fired in blends with coal between 8% and 15% wood by weight. Of the input fuel energy, 2.8% and 5.5% was from wood, and represented about 2.0 MW to 3.8 MW biomass power. The most difficult problem was unit operating stability. The coal wood mixtures had much lower fuel energy to volume ratio than the baseline coal.
Discussion:	With 10% co-firing, boiler efficiency was about the same as coal alone, while there was a slight reduction in efficiency with 15% wood. This result was unexpected because of the high moisture content of the wood chips (50%-67%)	Does not describe the exact course of action when problems occur.

The objectives of this research were to determine under what conditions of size, composition, and moisture content that green wood chips can be successfully co-fired with coal, and how co-milling green wood chips affects power plant operations. Green wood chips were successfully co-fired in blends with coal between 8% and 15% wood by weight. Of the input fuel energy, 2.8% and 5.5% was from wood, and represented about 2.0 MW to 3.8 MW biomass power. Sulfur emissions were reduced, and particulates were no higher with co-firing. There are questions yet to be resolved regarding the effect of co-firing on carbon monoxide. The measured impact on NOx emissions was small. With 10% co-firing, boiler efficiency was about the same as coal alone, while there was a slight reduction in efficiency with 15% wood. This result was unexpected because of the high moisture content of the wood chips (50%-67%). However, higher moisture losses were offset or nearly offset by reduced dry gas losses up the stack.

In my opinion, a research conducted in sufficient detail are all input parameters and announced the results. Also announced on the issues and problems arising in the course of the study. The results can be replicated in the real conditions on the appropriate equipment. As a result of the research has turned a viable technology that could be introduced into the industry.