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首页> 外文会议>ASME turbo expo: turbine technical conference and exposition >FEASIBILITY STUDY ON DEHYDROGENATION OF LOHC USING EXCESS EXHAUST HEAT FROM A HYDROGEN FUELED MICRO GAS TURBINE
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FEASIBILITY STUDY ON DEHYDROGENATION OF LOHC USING EXCESS EXHAUST HEAT FROM A HYDROGEN FUELED MICRO GAS TURBINE

机译：利用氢致微型燃气轮机排出的余热对LOHC进行加氢的可行性研究

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In recent years, renewable energy technologies have received increasing attention. However, the constant availability of renewable energies is not predictable, so that technologies for excess energy storage become increasingly important. One possibility for the technical implementation of such a storage technology is to bind hydrogen, produced using this excess energy, to liquid organic compounds, so-called Liquid Organic Hydrogen Carriers (LOHC), where hydrogen is bound to a H_2-lean LOHC molecule in an exothermal hydrogenation reaction. The dehy-drogenation process releases the stored hydrogen in an endothermal reaction. This technology offers advantages such as storage and transport safety, along with the high energy density. LOHC systems can assist in the realization of future distributed energy supply networks, as well. Micro gas turbines (MGT) play an important role in distributed energy supply, so that the coupling of a hydrogen fueled MGT with a reactor for the dehydrogena-tion process is a desirable achievement. In such a combined system, the excess exhaust enthalpy can be used to maintain the en-dothermal dehydrogenation reaction without affecting the overall efficiency of the gas turbine. This paper investigates the feasibility of a direct coupling between a hydrogen fueled recuperated micro gas turbine and the dehydrogenation process using the excess exhaust heat. For this purpose, a numerical simulation based on energy balances and thermodynamic equilibrium is implemented to model the process. Primary criteria for the evaluation of the process feasibility are the MGTs exhaust gas temperature, the exhaust gas mass flow rate, and the LOHC mass flow rate through the dehydrogenation unit. These three param- eters specify the mass flow rate of LOHC, which can be dehy-drogenated and thus, the mass flow rate of released hydrogen. Using the implemented numerical model, the suitability of two different LOHCs, N-Ethylcarbazole and an industrial heat transfer oil is investigated at two different pressure levels with respect to thermodynamic feasibility and process efficiency. The results show that the usable excess enthalpy in the exhaust gas of the investigated Turbec T100 MGT is sufficient to release enough hydrogen for re-use as fuel in the micro turbine process for three of the four investigated cases.
机译：近年来，可再生能源技术受到越来越多的关注。但是，可再生能源的持续可用性是不可预测的，因此用于多余能量存储的技术变得越来越重要。这种存储技术在技术上的实现的一种可能性是将利用这种多余能量产生的氢与液态有机化合物（所谓的液态有机氢载体（LOHC））结合，其中氢与低H_2贫LOHC分子结合。放热氢化反应。脱氢过程在吸热反应中释放出储存的氢。该技术具有诸如存储和运输安全以及高能量密度的优点。 LOHC系统也可以帮助实现未来的分布式能源供应网络。微型燃气轮机（MGT）在分布式能源供应中起着重要作用，因此将氢燃料MGT与用于脱氢过程的反应器耦合是一项理想的成就。在这样的组合系统中，过量的排气焓可以用于维持热内脱氢反应而不影响燃气轮机的整体效率。本文研究了利用氢气回收的微型燃气轮机与利用过量余热进行脱氢过程之间直接耦合的可行性。为此目的，基于能量平衡和热力学平衡的数值模拟被实施以对过程建模。评估工艺可行性的主要标准是MGT的废气温度，废气质量流量和通过脱氢装置的LOHC质量流量。这三个参数指定了LOHC的质量流速，可以将其脱氢，从而确定释放出的氢气的质量流速。使用实施的数值模型，就热力学可行性和工艺效率而言，在两个不同的压力水平下研究了两种不同的LOHC，N-乙基咔唑和工业传热油的适用性。结果表明，所研究的Turbec T100 MGT的废气中可用的过量焓足以释放出足够的氢气，以便在所研究的四种情况中的三种情况下在微型涡轮机工艺中重新用作燃料。

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