热力发电
熱力髮電
열력발전
THERMAL POWER GENERATION
2015年
1期
112-114,118
,共4页
核电机组%主冷却剂泵%石墨瓦块%磨损%电磁铁%冷却回路%静压力
覈電機組%主冷卻劑泵%石墨瓦塊%磨損%電磁鐵%冷卻迴路%靜壓力
핵전궤조%주냉각제빙%석묵와괴%마손%전자철%냉각회로%정압력
nuclear power unit%primary coolant pump%graphite bearing pad%abrasion%electromagnet%cooling circuit%static pressure
针对田湾核电机组主冷却剂泵(主泵)运行中出现的止推轴承石墨瓦块表面存在异常磨损的问题，根据水润滑轴承工作原理和磨损机理进行分析研究，发现磨损的主要原因是：1)主泵启、停过程摩擦副瓦块轴向载荷偏大；2)主泵内流体存在大量小气泡在高压作用下被压缩和凝结，使石墨瓦表面形成明显的空化腐蚀。因此，提出：1)长期投用电磁铁，可将主泵的轴向载荷由450 kN降至约200 kN(该方法正处于试验阶段)；2)将主泵水箱封闭，采用盐水系统压力提高石墨瓦冷却回路静压力。该方案实施后主泵运行正常，未再发生因参数超标而导致的机组停机故障，有效解决了石墨瓦块表面磨损问题。
針對田灣覈電機組主冷卻劑泵(主泵)運行中齣現的止推軸承石墨瓦塊錶麵存在異常磨損的問題，根據水潤滑軸承工作原理和磨損機理進行分析研究，髮現磨損的主要原因是：1)主泵啟、停過程摩抆副瓦塊軸嚮載荷偏大；2)主泵內流體存在大量小氣泡在高壓作用下被壓縮和凝結，使石墨瓦錶麵形成明顯的空化腐蝕。因此，提齣：1)長期投用電磁鐵，可將主泵的軸嚮載荷由450 kN降至約200 kN(該方法正處于試驗階段)；2)將主泵水箱封閉，採用鹽水繫統壓力提高石墨瓦冷卻迴路靜壓力。該方案實施後主泵運行正常，未再髮生因參數超標而導緻的機組停機故障，有效解決瞭石墨瓦塊錶麵磨損問題。
침대전만핵전궤조주냉각제빙(주빙)운행중출현적지추축승석묵와괴표면존재이상마손적문제，근거수윤활축승공작원리화마손궤리진행분석연구，발현마손적주요원인시：1)주빙계、정과정마찰부와괴축향재하편대；2)주빙내류체존재대량소기포재고압작용하피압축화응결，사석묵와표면형성명현적공화부식。인차，제출：1)장기투용전자철，가장주빙적축향재하유450 kN강지약200 kN(해방법정처우시험계단)；2)장주빙수상봉폐，채용염수계통압력제고석묵와냉각회로정압력。해방안실시후주빙운행정상，미재발생인삼수초표이도치적궤조정궤고장，유효해결료석묵와괴표면마손문제。
The abnormal abrasion of graphite pad surface on thrust bearing occurred during operation of the primary coolant pump (PCP)in Tianwan Nuclear Power Plant was analyzed,on the basis of the work prin-ciple and wear mechanism of the water lubrication bearing.It pointed out that the major reasons include:1) over large axial load of friction pairs during startup and shutdown of the PCP;2)obvious cavitation corro-sion on the graphite pad surface,caused by a great amount of bubbles being compressed and condensing at high pressures during fluid flowing in the PCP.Thus,several suggestions were put forward:1)using elec-tromagnet for a long time to reduce the axial load of the PCP from 450 kN to about 200 kN,and this meth-od is during the experimental stage;2)closing the PCP water tank and pressurizing the PCP water tank by saline system to improve the hydrostatic head of graphite pad cooling circuit.After the second method was adopted,the PCP ran normal and abnormal shutdown problems of the unit resulted by parameter over standard have never happened.
