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- Pari, Luigi, et al.
(författare)
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Combined harvesting of chaff and straw for bioethanol production : The first experience on wheat in Sweden
- 2018
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Ingår i: European Biomass Conf. Exhib. Proc.. ; , s. 289-293
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Konferensbidrag (refereegranskat)abstract
- The purpose of this work is the evaluation of a harvest chain aimed at incorporating the chaff into the straw bales as consequence of wheat harvest operation. The test was performed in August 2017 in Uppsala, Sweden, using a commercial hybrid combine harvester equipped with a modified chaff spreader and a tractor with round baler. In particular, the chaff spreader was used as chaff recovery system to redirect the chaff into the straw flow during its fall on the ground and get the product admixed in the straw swath. The combine was also used with the recovery systems in “spreading mode” to be experimented as control. A few companies are approaching this engineering challenge, however, as the market of agricultural residues for fuel production is growing, simple and affordable solutions should be identified and commercialized. This paper can be considered as a primary attempt to find a simplified and affordable solution in this direction. The results show different harvesting performances according to machine settings. Indeed, when the recovery system was used, the material falling into the swath and baled was about 340 kg (14%) higher per ha (dry basis). However, respect the amount of biomass potentially available for baling, high harvest losses were identified and indicated the need to repeat the test with other machineries and find further adjustments.
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| 2. |
- De Toro, Alfredo, et al.
(författare)
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Cereal harvesting : Strategies and costs under variable weather conditions
- 2012
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Ingår i: Biosystems Engineering. - : Elsevier BV. - 1537-5110 .- 1537-5129. ; 111:4, s. 429-439
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Tidskriftsartikel (refereegranskat)abstract
- This study simulated 30 years of harvesting operations on an hourly basis with a harvesting model linked to a grain moisture model capable of predicting the moisture content of standing ripe wheat using historical weather data from Stockholm, Sweden, as input, in order to assess the effects of weather on cereal harvesting costs. Several combinations of harvester size and grain moisture ceiling were assessed on three cereal areas in terms of overall costs (machine + labour + timeliness + drying) and their annual variations.The main findings obtained by simulation and valid for regions with similar climate and agricultural conditions to the studied region were that: (a) available combining time was highly dependent on grain moisture ceiling, which showed large annual variation, e.g. a moisture ceiling of 21% (w.b.) was related to a potential harvesting time of 65% and a standard deviation of 24% (n = 30 years); (b) in order to complete harvesting operations in most years, it was necessary to operate at a moisture ceiling of 22-24% (w.b.), however, the average moisture content of the harvested grain was much lower, about 17-18%; (c) overall harvesting costs were estimated at approx €140 ha -1 for those systems performing relatively well, i.e. with a daily harvesting capacity of 4-5% of the cereal area and operating at a moisture ceiling of 22-24% (w.b.); and (d) the main sources of annual cost variation were firstly the timeliness costs and secondly the drying costs. © 2012 IAgrE.
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