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既有研究多是基于單一熱電廠，對生物質(zhì)原料的最佳收集半徑和收集方式的研究，然而，在傳熱閾值的限制下，即使對于縣市行政尺度來說，單一熱電廠也無法覆蓋整個需求范圍。另外，既有文章多集中于對收集半徑的研究，忽略了道路網(wǎng)絡(luò)對收集距離的影響。而基于特定研究案例得出的最經(jīng)濟(jì)運(yùn)輸半徑可能不適用于其他地區(qū)，特別是道路網(wǎng)絡(luò)密度相差較大的地區(qū)。因此，本研究致力于在多熱電廠前提下，探究生物質(zhì)原料的收集距離閾值與能源自給自足的變化模式，從而合理規(guī)劃生物質(zhì)資源點(diǎn)的運(yùn)輸量和運(yùn)輸路線，達(dá)到降低運(yùn)輸成本和提高能源自給自足程度的目的。
Existing studies on the optimal collection radius and collection method of biomass raw materials are mostly based on a single biomass CHP plant. Yet, with limitations in the heat transfer threshold, even for just a county or city, it’s impossible for a single biomass CHP plant to cover the whole range of demand. Furthermore, a majority of the studies today have placed focus on the collection radius, ignoring the effect of road network on the collection distance. The most economical transportation radius based on a specific case may not be applicable to other areas. This is particularly true with areas where the road network density varies significantly. Therefore, under the premise of multiple biomass CHP plants, this study is committed to exploring the BCDT and the change pattern of energy self-sufficiency. The aim is to reasonably plan the transportation volume and transportation route of biomass resource points, then ultimately reduce the transportation costs and enhance energy self-sufficiency.
當(dāng)熱電廠的BCDT變大時，資源點(diǎn)可選擇的運(yùn)輸目的地變多，生物質(zhì)原料的分配方案更加靈活。如Fig.2所示，以資源點(diǎn)1為例，當(dāng)BCDT為XXkm時，資源點(diǎn)1的原料只被允許運(yùn)輸至距離最近的熱電廠A，如果熱電廠A服務(wù)范圍內(nèi)的能源需求量低于收集范圍內(nèi)的資源潛力，資源點(diǎn)1的生物質(zhì)原料將被浪費(fèi)；而當(dāng)BCDT增加至XXkm時，資源點(diǎn)1的原料還可以被運(yùn)輸至資源潛力不足的熱電廠B，這就會提高整體的資源利用率。
As the BCDT of a biomass CHP plant increases, more transportation destinations will become available for the resource points. This also means more flexibility in the distribution plan of biomass raw materials. Taking resource point 1 as an example (as shown in Fig. 2), when the BCDT is XX km, the raw materials of resource point 1 can only be transported to the nearest biomass CHP plant A. If the energy demand within the service scope of biomass CHP plant A is lower than the resource potential within the collection range, the biomass raw materials of resource point 1 will be wasted. When the BCDT increases to XX km, the raw materials of resource point 1 can also be transported to biomass CHP plant B with insufficient resource potential, improving the overall resource utilization rate.
可以看出，BCDT越大，對于資源利用率和能源自給自足水平的提高越有利；然而，考慮到運(yùn)輸成本，BCDT無法無限制地擴(kuò)大。因此，本研究旨在探究最經(jīng)濟(jì)的BCDT，在保證較低運(yùn)輸成本的同時提高資源利用率和能源自給自足水平，為生物質(zhì)原料的統(tǒng)一規(guī)劃提供數(shù)據(jù)支持。
This shows that the greater the BCDT, the better the resource utilization rate and energy self-sufficiency. Considering the transportation costs, however, there are limits to how much the BCDT can expand. As such, this study aims to explore the most economical BCDT so that the resource utilization rate and energy self-sufficiency can be improved while ensuring a lower transportation cost. This will also in turn provide data support for the unified planning of biomass raw materials.