Chemical looping combustion (CLC) is an advanced oxyfuel process that enables CO₂ capture with low efficiency penalty. CLC of gaseous fuels has successfully been demonstrated in several pilots up to 150 kW_th. Numerous oxygen carriers have been tested regarding fuel conversion performance and lifetime. This work is a scale-up study of gaseous fuel CLC to MW_th scale. A Ca-Mn-based oxygen carrier has been developed and manufactured in ton-scale prior to the present test. Investigations were conducted in a 1 MW_th CLC unit that was adapted to utilize natural gas as fuel. Stable CLC conditions were reached during tests with Ca-Mn-based material, and the transition to operation with ilmenite was studied. The fuel conversion was in the range of 80%. During operation, 99% of the unburned methane was converted in the post oxidation chamber. The solids circulation rate and the lifetime of solids were determined by means of solids samples from the process, which were investigated in terms of attrition and degree of oxidation. The solids circulation rate was 17 tons h⁻¹ MW⁻¹ which is higher than in former tests but lower compared to other units. The most important limiting factors of the fuel conversion are the low solids inventory of the fuel reactor and the oxygen carrier to fuel ratio that corresponds to the solids circulation.

化学循环燃烧（CLC）是一种先进的含氧燃料工艺，能够以较低的效率损失捕获CO ₂。气态燃料的CLC已在150 kW _th以下的多个试点中得到成功证明。已经对许多氧气载体进行了燃料转换性能和寿命方面的测试。这项工作是将气态燃料CLC放大至MW _th规模的研究。在本试验之前，已经开发和制造了以吨为单位的基于钙锰的氧载体。调查是在一个1个MW进行_第适用于利用天然气作为燃料的CLC装置。在使用Ca-Mn基材料进行测试的过程中达到了稳定的CLC条件，并研究了钛铁矿向操作过渡的过程。燃料转化率在80％的范围内。在操作过程中，99％的未燃烧甲烷在后氧化室中转化。固体的循环速率和固体的寿命通过来自该方法的固体样品来确定，这些样品在磨损和氧化度方面进行了研究。固体循环速率为17吨h ^-1 MW ^-1比以前的测试要高，但比其他测试要低。燃料转化的最重要的限制因素是燃料反应器中低的固体存量和与固体循环相对应的氧载体与燃料的比率。