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首页> 外文期刊>Thermal engineering >Results of Examination of the TGMP-314 Boiler Superheaters of the Power-Generating Units at Kashira State District Power Plant Using a Magnetic Ferrite Meter
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Results of Examination of the TGMP-314 Boiler Superheaters of the Power-Generating Units at Kashira State District Power Plant Using a Magnetic Ferrite Meter

机译：喀什拉邦地区发电厂的TGMP-314锅炉过热器的电磁铁氧体仪测试结果

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摘要

The results of investigating the elemental composition of the scale and the metal of a tube circuit from the austenitic steel grade 12Crl8Nil2Ti are presented. The superheater is part of the high-pressure convection steam superheater of a TGMP-314 supercritical-pressure gas-and-oil-fired once-through boiler that had been operated for a long period of time. A structurally transformed layer, poor in iron, manganese, and chromium and rich in nickel was detected on the outer surface. The layer consisted predominantly of the FeNi_3 phase with ferromagnetic properties. The heat-resistance test of the steel in contact with ash that simulated the combustion products of fuel oil showed that the higher the temperature and the longer the test time, the higher the content of the ferritic phase in the layer was. The established pattern of the structural transformations underlies a method for nondestructive control of the thermal nonuniformity and detection of "worst" tube circuits of superheaters from austenitic steel. The magnetic ferritometry complements the conventional selective thickness gauging that does not characterize the condition of the heating surfaces of high-temperature steel grades to the full extend. Data on damageability of high-pressure convection superheaters and low-pressure second-stage convection superheaters with rarefied tube banks of TGMP-314 boilers are presented. The damage is caused by overheating resulting from the nonuniform temperature field at the inlet and by the nonuniform flue gas velocity field in rarefied superheater banks. Sections of the tube circuits from the steel grade 12Crl8Nil2Ti, outlet superheater stages of the TGMP-314 boiler of the power-generating units at Kashira SDPP were examined using an MF-51NTs AKASKAN magnetic ferrite meter. Thermal nonuniformity was established and the "worst" superheater tube circuits were detected. It was shown that the zones with the "worst" and damaged tube circuits coincide. The results of examining the superheaters with the help of a magnetic ferrite meter, of dimensional control, and of metallographic investigation of the samples cut out of the tube circuits are in agreement with each other.
机译：给出了从12Crl8Nil2Ti奥氏体钢中研究鳞片的元素组成和管电路的金属的结果。过热器是已运行了很长时间的TGMP-314超临界燃油和燃油直通式锅炉的高压对流蒸汽过热器的一部分。在外表面检测到结构转变的层，该层中的铁，锰和铬含量较低，而镍含量较高。该层主要由具有铁磁特性的FeNi_3相组成。模拟燃料油燃烧产物的与灰分接触的钢的耐热测试表明，温度越高，测试时间越长，层中铁素体相的含量越高。建立的结构转变模式是一种无损控制热不均匀性和检测奥氏体过热器“最坏”管回路的方法的基础。磁铁素体测量法是对传统的选择性测厚仪的补充，传统的测厚仪不能完全表征高温钢种加热表面的状况。给出了TGMP-314锅炉管束稀疏的高压对流过热器和低压第二级对流过热器的易损性数据。损坏是由于进口处温度场不均匀以及稀薄的过热器组中烟道气速度场不均匀而导致的过热所致。使用MF-51NTs AKASKAN磁铁氧体计检查了钢级12Crl8Nil2Ti的管回路截面，以及在Kashira SDPP发电设备的TGMP-314锅炉的出口过热器段。建立了热不均匀性，并检测到“最坏的”过热器管回路。结果表明，管电路最差和损坏的区域重合。借助于磁铁氧体计检查过热器，进行尺寸控制以及对从管路中切出的样品进行金相研究的结果彼此一致。

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