美国论文代写：生物质的利用与转化

美国论文代写：生物质的利用与转化。由于其不方便的形式和固有的体积，目前生物质的利用将是一个令人担忧的原因。与化石燃料相比，生物质能密度非常低，使用生物质能与化石燃料相比的优势将在如何转移和处理这些质量方面受到限制。“因此，与传统燃料相比，处理、储存和运输生物质原料的成本更高。因此，要充分利用生物质，就必须改善其性能，提高其处理、储存和运输能力”。接下来美国论文代写将为同学们分析下生物质的利用与转化。

为了便于处理，固体生物质被转化为某种气态或液态形式。生化和热化学转化是这种转化背后的化学反应。这种热化学形式的转化被称为生物质气化。气化建模是一个复杂的化学反应运行在一个专门为目的而开发的设置。文献综述的目的是关注不同研究人员在流化床气化中使用的不同模型的细节，以及用于预测系统中一些复杂活动的不同模拟模型。

与其他形式的气化炉相比，在流化床气化炉中观察到的一些关键特征是灰分条件如何不同。灰的条件可以是干燥的，也可以是凝聚的。所使用的设计配置将取决于char的使用量。流化床气化炉的特性也将根据具体项目所需的床层高度而有所不同。其他因素是所使用的反应堆，温度控制的数量和所需的热转化率。

其他反应堆之间的温度差异，灰转换的形式和更多的导致流化床气化炉成为气化炉的选择，为可持续燃料的工作。在稳定的温度下，环境支持较少的熟料形成，FBG能够在一端与相对活性煤和低等级煤一起工作，这使得它在气化中也是一个非常通用的选择。

在流体基气化炉的模拟和建模的多个研究中报告的其他一些好处如下。首先，流体基气化炉被认为支持更好的负载灵活性。这是一个必须的要求，在情况下的关键故障防止系统。在需要高传热率的地方，系统不能失效，为此，FBG系统是合适的。此外，与其他系统相比，FBG具有更好的流体灵活性。这意味着，饲料的范围，可以使用与FBG是相当高的比其他气化炉系统。因此，FBG具有更广泛的应用和用途。温度要求是相当温和的比较其他气化炉。氧化剂，热要求，使用均匀的温度，和更高的冷气体效率相比，其他气化炉使这是一个理想的选择。低碳转化率是FBG的特点之一。大量的焦炭循环需求可能是该系统的缺点。

The utilization of biomass in its present state would be a cause for concern because of its inconvenient forms and its inherent bulkiness (Loha et al., 2014). Biomass have a very lower energy density as compared to fossil fuel and the advantages for the use of biomass versus fossil fuel would be constrained in how such mass can be transferred and handled. “Handling, storage and transportation of biomass in its raw form thus becomes costlier in comparison to conventional fuels. Thus, to fruitfully utilize biomass, it becomes necessary to improve its properties which elevate its handling, storage and transportation ability” (Baruah & Baruah, 2014, p. 807).

In order to make it easier for handing purposes, the solid biomass is converted into some form of gaseous form or liquid form. Biochemical and thermochemical conversion is the chemical reaction behind this conversion. The thermochemical form of conversion is what is called biomass gasification. The gasification modeling is a complex chemical reaction run in a setup uniquely developed for the purpose. The purpose of the literature review is to focuses on the details of different models used by different researchers in fluidized bed gasification and different models of simulations used for prediction of some of the complex activities in the system.

Some key characteristics observed in the fluidized bed gasifier as opposed to other forms of gasifiers are that of how the ash conditions differ. Ash conditions can either be dry or it can be agglomerated. The design configuration used would depend on how much char would be used. Characteristics of the fluid bed gasifier will also differ as per the bed height needed for the specific project. Other factors are that of the reactor used, the amount of temperature control and thermal conversion rate that is required.

The temperature differences across other reactors, the form of ash conversion and more have led to the fluidized bed gasifier being the gasifier of choice for much of the work on sustainability fuels. The environment supporting lesser clinker formation at a steady temperature and the capability of the FBG to work with relatively reactive coals at one end, and low-ranking coals makes it a very versatile choice as well in gasification.

Some other benefits that are reported in multiple studies on the simulation and modeling of fluid-based gasifiers are presented as follows. Firstly, the fluid-based gasifier is seen to support better load flexibility. This is a must requirement in the case of critical fail proof systems. Where high heat transfer rates are required, the system must not fail, and for this, the FBG system is appropriate. Furthermore, compared to other systems, the FBG supports better fluid flexibility as well. This means that the range of feedstock that can be used with the FBG is quite high than other gasifier systems. A wider range of application and use is hence identified with the FBG. The temperature requirements are quite moderate compare to other gasifiers. Oxidant, heat requirements, the use of uniform temperature, and higher cold gas efficiencies as compared to other gasifiers make this an ideal choice. Lower carbon conversion is one of the characteristics of the FBG. Extensive char cycling requirement could be a con of the system.

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