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首页> 外文期刊>Energy & fuels >Role of ZnCI2 in High-Temperature Corrosion in a Bench-Scale Fluidized Bed Firing Simulated Waste Wood Pellets
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Role of ZnCI2 in High-Temperature Corrosion in a Bench-Scale Fluidized Bed Firing Simulated Waste Wood Pellets

机译：ZnCl2在台式流化床焙烧模拟废木粒中的高温腐蚀中的作用

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ABSTRACT: The development and improvement of the handling of waste wood toward higher economical and environmental standards, such as use to produce heat and electricity, has increased in many countries. Waste wood originates mainly from construction and demolition activities and commercial and industrial sources. However, it is known that waste wood usually contains substantial concentrations of heavy metals, particularly elevated amounts of Zn and Pb. In this paper, the importance of Zn in the corrosion process was investigated. To better understand the fate of Zn and its role and effect on high-temperature corrosion of heat exchanger tubes in waste-wood-fired fluidized-bed boilers, high-temperature corrosion/deposit probe tests have been performed. Corrosion tests were carried out in a 30 kWth bubbling 0uidized-bed (BFB) reactor. Tests were performed using pure wood pellets as a reference and wood pellets doped with ~0.5 wt % ZnCl_2. Two steels were selected for the tests: a low-alloy steel (10CrMo9-10) and an austenitic stainless steel (Sanicro 28). After corrosion/deposit probe exposures of 7 h, the material test rings were analyzed using scanning electron microscopy/energy-dispersive X-ray (SEM/EDX) to determine the oxide layer thickness and the elemental composition of the oxide scale and deposit. The results showed that combustion of wood pellets doped with ZnCl_2 had a detrimental effect on low-alloy steel when compared to the firing of untreated pellets. A noticeably thicker oxide layer was formed on the low-alloy rings when the test ring temperatures were >500 °C. The oxide layer was mainly composed of non-protective, mixed iron oxides covered with a thin layer of KCl-rich deposit, with significant amounts of ZnO and most likely K_2ZnCl_4 on the top of the scale. The corrosion rate on the high-grade steel seemed to be negligible under the tested conditions and exposure times. The results showed a very low rate of deposit buildup during the 7 h exposures of the corrosion/deposit probe in the tests with the simulated waste wood. The deposited ash was rich in corrosive KCL
机译：摘要：许多国家都朝着更高的经济和环境标准（例如用于产生热量和电力的标准）发展和改进了废木的处理。废木材主要来自建筑和拆除活动以及商业和工业来源。但是，已知废木材通常含有大量的重金属，特别是锌和铅的含量较高。本文研究了锌在腐蚀过程中的重要性。为了更好地了解锌的结局及其对废木燃料流化床锅炉中热交换器管高温腐蚀的作用和影响，已进行了高温腐蚀/沉积探针测试。腐蚀试验是在30 kWth鼓泡0床（BFB）反应器中进行的。使用纯木颗粒作为参比并掺有〜0.5 wt％ZnCl_2的木颗粒进行测试。测试中选择了两种钢：低合金钢（10CrMo9-10）和奥氏体不锈钢（Sanicro 28）。腐蚀/沉积探针暴露7小时后，使用扫描电子显微镜/能量分散X射线（SEM / EDX）对材料测试环进行分析，以确定氧化物层的厚度以及氧化物垢和沉积物的元素组成。结果表明，与未处理颗粒燃烧相比，掺有ZnCl_2的木质颗粒燃烧对低合金钢有不利影响。当测试环温度> 500°C时，在低合金环上会形成明显较厚的氧化层。氧化层主要由非保护性的混合氧化铁组成，上面覆盖着一层薄薄的富含KCl的沉积物，其中含有大量的ZnO和最有可能在氧化皮顶部出现K_2ZnCl_4。在测试条件和暴露时间下，高等级钢的腐蚀速率似乎可以忽略不计。结果表明，在用模拟废木材进行的测试中，腐蚀/沉积探针暴露7 h期间沉积物堆积的速率非常低。沉积的灰分富含腐蚀性KCL

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  • 来源
    《Energy & fuels》 |2011年第julaaaug期|p.3476-3483|共8页
  • 作者

    Dorota Bankiewicz; Elisa Alonso-Herranz; Patrik Yrjas; Tor Laurén; Hartmut Spliethoff; Mikko Hupa;

  • 作者单位

    Process Chemistry Centre, Abo Akademi University, Piispankatu 8,20SOO Turku, Finland;

    Lehrstuhl fur Energiesysteme, Technische Universitat Miinchen, Boltzmannstrasse 15, S5748 Garching, Germany;

    Process Chemistry Centre, Abo Akademi University, Piispankatu 8,20SOO Turku, Finland;

    Process Chemistry Centre, Abo Akademi University, Piispankatu 8,20SOO Turku, Finland;

    Lehrstuhl fur Energiesysteme, Technische Universitat Miinchen, Boltzmannstrasse 15, S5748 Garching, Germany;

    Process Chemistry Centre, Abo Akademi University, Piispankatu 8,20SOO Turku, Finland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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